Class 11 Biology

Biology Human Growth Development Multiple Choice Questions

Question 1. Which breaks the dormancy of potato tuber?

1. Gibbercllin
2. IAA
3. ABA
4. Zcalin.

Answer: 1. Gibberellin

mcq of biology

Question 2. The hormone responsible for senescence is:

1. ABA
2. Auxin
3. GA
4. Cytokinin.

Answer: 1. ABA

Question 3. Which of the following prevents the fall of fruits?

1. GA3
2. NAA
3. Ethylene
4. Zcatin.

Answer: 2. NAA

Question 4. The plants respond to photoperiods due to (the presence of:

1. Stomata
2. Phytochromes
3. Phytohormones
4. Enzymes.

Answer: 2. Phytochromes

multiple choice biology questions

Question 5. Which of the following types of phytohormones resemble nucleic acids in some structural aspects?

1. Cytokinins
2. Auxins
3. Gibberellins
4. Abscisic acid.

Answer: 2. Auxins

Question 6. Ripening of fruits can be accelerated by :

1. Heating
2. Ethylene
3. Nitrogen
4. IAA.

Answer: 2. Ethylene

biology multiple choice questions

Question 7. Coconut milk factor is:

1. abscisic acid
2. cytokinins
3. an auxin
4. a gibberellin.

Answer: 2. cytokinins

Question 8. In arithmetic growth, following mitotic cell division, only one daughter cell continues to divide while others differentiate by plotting the length of the organ against time, a linear curve is obtained. It is expressed as :

1. Lt = rt – LO
2. Lt = tR + LO
3. LO = Lt + rt
4. Lt = LO + rt.

Answer: 4. Lt = LO + rt.

Question 9. The stress-related hormone abscisic acid also :

1. aids in the development of fruit
2. helps in the closure of stomata
3. stimulates cell division
4. accelerates fruit ripening.

Answer: 2. helps in the closure of stomata

Question 10. Apical dominance is due to a high concentration of:

1. auxin in terminal bud
2. gibberellin in the apical bud
3. auxin in lateral bud
4. auxin and gibberellin in the lateral bud.

Answer: 1. auxin in terminal bud

Question 11. Regulation of flowering by length of day and night is :

1. phototropism
2. photoperiodism
3. nyctinasty
4. none of the above.

Answer: 2. photoperiodism

Question 12. Pruning of plants promotes branching due to sensitization of axillary buds by :

1. Ethylene
2. Cytokinin
3. Gibberellin
4. IAA.

Answer: 4. IAA.

Question 13. One set of plants was grown at 12 hours day and 12 hours night period cycles and it flowered while in other set night phase was interrupted by a flash of light and did not produce flowers. Under which one of the following categories will you place this plant?

1. Long day plant
2. Day-neutral plant
3. Short day plant
4.  Darkness neutral plant.

Answer: 3. Short day plant

Question 14. Cell elongation in internodal regions of green plants takes place due to :

1. Cylokinm
2. Gibberellin
3. Indolcacctic acid
4. Ethylene,

Answer: 2. Gibberellin

Question 15. Senescence is inhibited by :

1. Ethylene
2. Gibberellic acid
3. Abscisic acid
4. Cytokinin.

Answer: 4. Cytokinin

Question 16. To lest any chemical substance by using the living system is called

1. Grafting
2. Cloning
3. Biopsy
4. Bioassay.

Answer: 4. Bioassay.

Question 17. Which hormone is the maximum in coconut milk?

1. Gibberellin
2. Ethylene
3. Cytokinin
4. Auxin.

Answer: 3. Cytokinin

Question 18. Gibberellins can promote seed germination because they influence

1. the rate of cell division
2. production by hydrolyzing enzyme
3. synthesis. abscisic acid
4. absorption of water through the hard seed coat.

Answer: 2. production of hydrolyzing enzymes

Question 19. Avena curvature lest is a bioassay for examining the activity of:

1. auxins
2. gibberellins
3. cytokinins
4. ethylene,

Answer: 1. auxins

Question 20. An enzyme that can stimulate the germination of barley seeds is:

1. Inverlasc
2. Protease
3. a-amylase
4. Lipase.

Answer: 3. a-amylase

Question 21. In which of the following fruits is the edible part of the aril?

1. Orange
2. Litchi
3. Pomegranate
4. Custard apple.

Answer: 2. Litchi

Question 22. Treatment of seed at low temperature under moist conditions to break its dormancy is called :

1. Chelation
2. Stratification
3. Scarification
4. Vernalization.

Answer: 4. Vernalization

Question 23. Parthenocarpic tomato fruits can be produced by :

1. raising the plants from vernalized seeds
2. treating the plants with phenylmercuric acetate
3. removing androecium of flowers before pollen grains are released
4. treating the plants with low concentrations of gib-acrylic acid and auxins.

Answer: 4. Treat the plants with low concentrations of gib- bicyclic acid and auxins.

Question 24. How does pruning help in making the hedge dense?

1. The apical shoot grows faster after pruning
2. It releases wound hormones
3. It induces the differentiation of new shoots from the rootstock
4. It frees axillary buds from apical dominance

Answer: 4. It frees axillary buds from apical dominance

Question 25. Which one of the following pairs, is not correctly matched?

1. Gibberellic Acid-Leaf fall
2. Cytokinin-Cell division
3. IAA-Ccll wall elongation
4. Abscisic Acid-Stomatal closure.

Answer: 1. Gibberellic Acid-Leaf fall

Question 26. The wavelength of light absorbed by the Pr form of phytochrome is:

1. 680 nm
2. 720 nm
3. 620 nm
4. 640 nm

Answer: 1. 680 nm

Question 27. “Foolish Seedling” disease of rice led to the discovery of:

1. ABA
2. 2, 4 – D
3. IAA
4. GA.

Answer: 4. GA.

Question 28. One hormone helps in the ripening of fruits while the other stimulates the closure of stomata. These are respectively :

1. abscisic acid and auxin
2. ethylene and abscisic acid
3. abscisic acid and ethylene
4. ethylene and gibberellic acid
5. gibberellic acid and abscisic acid.

Answer: 2. ethylene and abscisic acid

Question 29. Pick out the correct statements :

A. Cytokinins especially help in delaying senescence

B. Auxins are involved in regulating apical dominance

C. Ethylene is especially useful in enhancing seed germination

D. Gibberellins are responsible for the immature falling of leaves.

1. (A) and (C) only
2. (A) and (D) only
3. (B) and (C) only
4. (A) and (B) only
5. (B) and (D) Only.

Answer: 4. (B) and (D) Only.

Question  30. Match List I and List II and select the correct option.

1. (A)-3 (B)-1,  (C)-5,  (D)-4,  (E)-2
2. (A)-4 (B)-5,  (C)-1  (D)-3,  (E)-2
3. (A)-2. (B)- 1, (C)-5,  (D)-3.  (E)-4
4. (A)-3, (B)- l  (C)-5.  (D)-2,  (E)-4
5. (A)-4. (B)- 1,  (C)-5  (D)- 3,  (E)-2.

Answer: 1. A)-3 (B)-1,  (C)-5,  (D)-4,  (E)-2

Question 31. Senescence is an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in:

1. annual plants
2. floral parts
3. vessels and tracheid differentiation
4. leaf abscission.

Answer: 2. floral parts

Question 32. The importance of day length in the flowering of plants was first shown in

1. cotton
2. Petunia
3. Lemna
4. tobacco.

Answer: 4. tobacco.

Question 33. One hormone is used to speed up the malting process in barley, another is used to promote flowering in pineapple, and the third helps in the delay of leaf senescence. These are respectively.

1. auxin, gibberellin, and cytokinin
2. gibberellin, cytokinin, and auxin.
3. gibberellin, auxin, and cytokinin
4. cytokinin, auxin, and gibberellin
5.  auxin, cytokinin, and gibberellin.

Answer: 3. gibberellin, auxin, and cytokinin

Question 1. One End Of Each Semicircular Is Enlarged to form A Small Rounded Structure Called

1. Ampulla
2. Lagena
3. Crislnc
4. Pars Basilaris.

Answer: 1. Ampulla

Question 2. Extraordinary Hearing Ability Is Possessed By :

1. Owl
2. Mosquito
3. Frog
4. Bat.

Answer: 4. Bat.

sense organs definition

Question 3. In Man, The Vision Is :

1. Uniocular
2. Binocular
3. Mosaic
4. Opposition Type.

Answer: 2. Binocular

Question 4. The Sense Of Hearing Is Located In The :

1. Semi-Circular Canals
2. Organ Of Corti
3. Eustachian Tube
4. Ampulla.

Answer: 2. Organ Of Corti

Question 5. The Nose Is A :

1. Mechanoreceptors
2. Chemoreceptor
3. Thermal Receptor
4. Cold Receptor.

Answer: 2. Chemoreceptor

Question 6. The Chemoreceptors Are The :

1. Organs Of Smell
2. Organs Of Hearing
3. Organs Of Smell And Taste
4. Organs Of Touch.

Answer: 3. Organs Of Smell And Taste

Question 7. Proprio -Receptors Respond To :

1. Mechanical Stimuli
2. Chemical Stimuli
3. Odour
4. None Of The Above.

Answer: 1. Mechanical Stimuli

Question 8. Naked Dendrites Are Receptors For :

1. Taste
2. Touch
3. Smell
4. Odour.

Answer: 2. Touch

Question 9. Receptors Of Deep Pressure Present In Deep Layers Of Skin Are :

1. Krause’s End Bulbs
2. Meissner’S Corpuscles
3. Pacinian Corpuscles
4. Corpuscles Of Ruffini.

Answer: 3. Pacinian Corpuscles

sensory organs function

Question 20. Jacobson’s Organ Is Concerned With :

1. Smell
2. Burrowing
3. Touch
4. Sight.

Answer: 1. Smell

Question 21. The Ear Pinna In Mammals Has :

1. Protective Action
2. Sound Collecting Action
3. Sound Perceiving Action
4. No Function.

Answer: 2. Sound Collecting Action

Question 22. In Frog, The Taste Buds Are Confined To :

1. Tongue
2. Buccal Cavity
3. Tongue And Roof Of Buccal Cavity
4. Tongue And Floor Of Buccal Cavity.

Answer: 3. Tongue And Roof Of Buccal Cavity

Question 23. Receptors Which Have Sensitive To Pain Are Called :

1. Tangoivceptors
2. Algesiivceptors
3. Frigidonvcplors
4. Theo receptors.

Answer: 2. Algesiivceptors

Question 24. The Maintenance Of Proper Balance in Daring Athletic Activity Is Done By :

1. Cochlea
2. Auditory Canal
3. Tympanic Membrane
4. Semicircular Canal.

Answer: 4. Semicircular Canal

five organs in the human body

Question 25. In Comparison To The Internal Ear Of a Frog, The Internal Of a Rabbit Has:

1. A Smaller Cochlea
2. A Longer Coiled Cochlea
3. Fused Utriculus And Sacculus
4. No Sacculus.

Answer: 2. A Longer Coiled Cochlea

Question 26. Ear Is Most Sensitive To :

1. 20 Cycles /Sec
2. 1000 Cycles /Sec
3. 10,000 Cycles /Sec
4. 40,000 Cycles/Sec.

Answer: 2. Increased Pressure Of Fluid In The Eye Ball

Question 27. Glaucoma Is An Eye Disease Arising From :

1. Increased Pressure Of Fluid In The Eye Ball
2. Elongation Of Eye Ball
3. Shortening Of Eye Ball
4. Opacity Of The Retina.

Answer: 1. Increased Pressure Of Fluid In The Eye Ball

what are sense organs how are they useful to us

Question 28. Which One Of The Following Is The Function Of Iris In The Eye Of Frog?

1. Alters The Size Of Pupil
2. Moves The Lens Forward
3. Moves The Lens Backward
4. Brings About The Movement Of Nictitating Membrane.

Answer: 1. Alters The Size Of Pupil

Question 29. Human Eye Lens Is :

1. Spherical And Can Be Moved Forward
2. Biconvex And Cannot Be Moved Forward
3. Spherical And Cannot Be Moved Forward
4. Biconvex And Can Be Moved Forward.

Answer: 2. Biconvex And Cannot Be Moved Forward

Question 30. A Molecule Cannot Be Tasted Or Smelled Until It Has Been :

1. Converted Into A Protein
2. Converted Into A Neurotransmitter
3. Grouped Into A Multimolecular Complex
4. Dissolved In A Liquid.

Answer: 4. Dissolved In A Liquid.

Question 31. The Receptors For Both Taste And Smell Are :

1. Mechanoreceptors
2. Chemoreceptors
3. Thermoreceptors
4. Electromagnetic Receptors.

Answer: 2. Chemoreceptors

Question 32. The Taste Receptors Of A Bottom-Feeding Fish Are Located :

1. All Over Its Body Surface
2. Within Taste Buds Near Its Fins
3. Within Taste Buds On Its Gills
4. Within Its Mouth.

Answer: 1. All Over Its Body Surface

Question 33. Baroreceptors Or Pressure Receptors Tyre Present In The Walls Of:

1. Arteries
2. Veins
3. Right Atrium
4. All The Above.

Answer: 4. All The Above.

Question 34. The Taste Receptors Of All Terrestrial Vertebrates Are Located :

1. All Over The Body Surface
2. Within Taste Buds In The Trachea
3. Within The Nasal Cavity
4. Within Taste Buds In The Mouth.

Answer: 4. Within Taste Buds In The Mouth.

Question 35. Most Of What We “Taste” In Food Is Actually :

1. Imagined By Our Cerebral Cortex
2. A Memory From Childhood, When We Had More Taste Receptors
3. Odours
4. Normal Components Of Saliva.

Answer: 3. Odours

Question 36. The Taste Receptors Of A Bottom Feeding Fish Are Located :

1. Within Taste Buds In The Mouth
2. Within The Taste Buds In Trachea
3. Within The Nasal Cavity
4. All Over Its Body Surface.

Answer: 4. Within The Nasal Cavity

Question 37. Camera Eyes Are Found In :

1. Insects
2. Spiders
3. Birds
4. Crab.

Answer: 3. Birds

Question 38. Which Of The Following Types Of Eyes Has The Widest Range Of Vision?

1. Ocelli
2. Camera Eyes
3. Compound Eyes Of Insects
4. Simple Eyes Of Insects.

Answer: 2. Camera Eyes

Question 39. Well Developed Sonar System Is Present In :

1. Monkeys
2. Crocodiles
3. Bats
4. Pigeon.

Answer: 3. Bats

Question 40. The Eye Of The Following Group Resembles The Vertebrate Eye:

1. Cephalopoda
2. Bivalvia
3. Gastropoda
4. Pelecypoda.

Answer: 1. Cephalopoda

Question 41. The Coats Of Eyeball Are :

A. Sclera

B. Retina

C. Conjunctiva

D. Otolith Membrane.

Answer Codes :

1. A And C Are Correct
2. B And D Are Correct
3. A And B Are Correct
4. A, B And C Are Correct.

Answer: 3. A And B Are Correct

Question 42. A 22-year student Goes To His Ophthalmologist. He Has a Problem In Reading Books Because He Is Not Able To Contract His :

1. Iris
2. Pupil
3. Ciliary Muscles
4. Suspcusoty Ligament.

Answer: 3. Ciliary Muscles

Question 43. The Ivivcptum Ot Sound In Mammals Is By Stimulation Of Mechanoreceptors Located In :

1. Saculus
2. Semicircular Canal
3. Organ Of Coni
4. Reissner’s Membrane.

Answer: 3. Organ Of Coni

Question 44. Which Statement About Olfaction Is Not True?

1. Dogs Are Unusual Among Mammals, In That They Depend More On Olfaction Than On Vision, As Their Dominant Sensory Modality.
2. Olfactory Stimuli Are Recognised By The Interaction Between The Stimulus And A Specific Macromolecule On Olfactory Hairs
3. The Greater The Number Of Action Potentials Generated By An Olfactory Receptor, The Greater The Intensity Of Die Perceived Smell
4. The Perception Of Different Smells Results From The Activation Of Different Combinations Of Olfactory Receptors.

Answer: 3. The Greater The Number Of Action Potentials Generated By An Olfactory Receptor, The Greater The Intensity Of Die Perceived Smell

Question 45. The Membrane That Gives Us The Ability To Discriminate Different Pitches Of Sound Is The :

1. Round Window
2. Tympanic Membrane
3. Tectorial Membrane
4. Basilar Membrane.

Answer: 3. Tectorial Membrane

Question 46. The Colour In Vision Results From The :

1. Different Absorption Of Wavelengths Of Light By Different Classes Of Rods
2. Ability Of Each Cone To Absorb All Wavelengths Of Light Equally
3. Lens Of The Eye Acting Like A Prism And Separating The Different Wavclenphts Hy Light
4. Three Different Isomers Of Opsin In Different Classes Of Cone Cells.

Answer: 4. Three Different Isomers Of Opsin In Different Classes Of Cone Cells.

Question 47. During Accommodation For Near Vision :

1. Images From The Distant Objects Arc Focussed Behind The Retina
2. The Focussing Power Of The Lens Is Increased
3. The Sympathetic Nerves To The Eye Arc Activated
4. The Pupil Does Not Constrict.

Answer: 2. The Focussing Power Of The Lens Is Increased

Question 48. Which Of The Following Is Incorrect?

1. Perception Is The Conscious Awareness And Interpretation Of Sensation
2. Dancers And Sports Persons Can Maintain Their Proper Body Position By Using Their Internal Sense Of Balance
3. Each Eye Weighs Only 7 Gms
4. Embedded In The Tarsal Plate Of the Eyelid Is a Row Of Elongated Modified Sebaceous Glands Called Meibomian Glands.

Answer: 2. Dancers And Sports Persons Can Maintain Their Proper Body Position By Using Their Internal Sense Of Balance

Question 49. Which Of The Following Is Not Correct Pairing?

1. Glands Of Zeis – Modified Sebaceous Glands (Oil Glands)
2. Glands Of Moll – Modified Sweat Glands (Sudori¬Ferous Glands)
3. Meibomian Glands – Modified Sebaceous Glands
4. Harderian Glands – Modified Sweat Glands.

Answer: 4. Harderian Glands – Modified Sweat Glands.

Question 50. Rhabdome Is Found In The Eyes Of:

1. Insects
2. Annelids
3. Rabbit
4. Frog.

Answer: 1. Insects

Plant Anatomy Question From Competitive Examinations

Question 1. In floating leaved plants, stomata occur on:

1. Lower surface
2. Upper surface
3. Both sides
4. Absent.

Answer: 2. Upper surface

plant anatomy mcqs

Question 2. Vascular bundles occur in a ring in:

1. Monocot stem
2. Leaf
3. Root
4. Dicot stems.

Answer: 4. Dicot stem.

Question 3. A.T.S. of the stem is stained first with safranin and then fast green. What would be the colour of the phloem?

1. Red
2. Green
3. Orange
4. Purple.

Answer: 2. Green

anatomy of flowering plants

Question 4. Passage cells occur in:

1. Epidermis
2. Cortex
3. Endodermis
4. Pericycle.

Answer: 3. Endodermis

Question 5. Casparian strips occur in:

1. Longitudinal and radial walls of epidermal cells
2. Longitudinal walls of xylem
3. All walls of endodermis
4. Radial walls of endodermis.

Answer: 4. Radial walls of endodermis.

morphology of flowering plants mcq class 11

Question 6. Loading of phloem is related to:

1. Increase of sugar in phloem
2. Elongation of phloem cell
3. Separation of phloem parenchyma
4. Strengthening of phloem fibre.

Answer: 1. Increase of sugar in phloem

Question 7. Roots of which plant contain a red pigment which has an affinity for oxygen:

1. Canon
2. Soyabean
3. Mustard
4. Radish.

Answer: 2. Soyabean

Question 8. In the monocot root, we observe:

1. Conjoint, collateral, closed, polyarch vascular bundle
2. Exodermis, end arch, and tetrarch closed bundles
3. Suberized exodermis, Casparian strip, passage cells cambium
4. Suberized exodermis, polyarch xylem, pith.

Answer: 4. Suberized exodermis, polyarch xylem, pith.

Question 9. Dead cells that serve mechanical functions are:

1. Sclerenchyma
2. Companion cells
3. Collenchyma
4. Wood parenchyma.

Answer: 1. Sclerenchyma

Question 10. Annual rings are found in plants belonging to:

1. Arabic region
2. Temperate areas
3. Tropics
4. Near sea beaches.

Answer: 2. Temperate areas

Question 11. ‘Histogen theory’ was proposed by:

1. Hanstein
2. Eamu
3. Esmam
4. Schmidt.

Answer: 1. Hanstein

Question 12. In the diagram of the T.S. of Helianthus stem given below, certain parts have been indicated by alphabets; choose the answer in which these alphabets have been correctly matched with the parts which they 

1. A = Epidermis, B = Epidermal hairs
   C = Parenchyma, D = Starch sheath
   E = Hypodermis (collenchyma),
   F = Vascular bundle
   G = Bundle cap, H = Medulla or pith
   I = Pith
2. A = Epidermis hairs, B = Epidermis
   C = Hypodermis (Collenchyma),
   D = Parenchyma
   E = Starch sheath, F = Bundle cap
   G = Vascular bundle, H = Medullary rays.
   I = Medullary rays
3. A = Epidermal hairs, B = Epidermis
   C = Hypodermis (collenchyma),
   D = Starch sheath, E = Parenchyrna,
   F = Vascular bundle, G = Bundle cap,
   H = Medulla or pith, I = Medullary rays.
4. A = Epidermal hairs, B = Epidermis
   C = Parenchyma, D = Hypodermis (Collenchyrnil)
   E = starch sheath, F = Vascular bundle
   G = Bundle cap, H = Medulla or pith
   I = Medullary rays
5. C = Hypodermis (Collenchyma),
   D = Parenchyma
   E = Starch sheath, F = Bundle cap
   G = Vascular bundle, H = Medullary rays.
   I = Medullary rays

Answer: 2. A = Epidermis hairs, B = Epidermis

Question 13. In the diagram of the cross-section of the vascular bundle of the monocot stem given aside, different parts have been indicated by alphabets; choose the answer in which these alphabets have been correctly matched with the parts which they indicate

morphology of flowering plants class 11 mcq

1. A = Bundle sheath, B = Broken phloem,
   C = Metaphloem, D = Metaxylem,
   E = Protoxylem, F = xylem parenchyma,
   G = Lysigenous cavity
2. A = Bundle cap, B = Metaphloem,
   C = Protophloem, D = Protoxylem,
   E = Metaxylefit, F = Lysigenous cavity,
   G = Xylem parenchyma
3. A = Bundle sheath, B = Primary phloem,
   C = Secondary phloem, D = Primary xylem,
   E = secondary xylem, F = Xylem fibres,
   G = Hydathode
4. A = Bundle cap, B = Metaxylem,
   C = Metaphloem, D = Protoxylem,
   E = Protophloem, F = Lysigenous cavity,
   G = Xylem parenchyma.

Answer: 1. A = Bundle sheath, B = Broken phloem,
C = Metaphloem, D = Metaxylem,
E = Protoxylem, F = xylem parenchyma,
G = Lysigenous cavity

Question 14. Match the names of the structures listed under column-1 with the functions given under column 2. Choose the answer which gives the correct combination of the alphabet of the two columns:

1. 1=B, 2=D, 3=A, 4=C
2. 1=D, 2=A, 3=C, 4=E
3. 1=E, 2=C, 3=A, 4=D
4. 1=A, 2=D, 3=t, 4=C.

Answer: 2. 1=D, 2=A, 3=C, 4=E

Question 15. Match the types of vascular bundles listed under Column 1 with examples given under Column 2; choose the answer which gives the correct combination of the alphabets of the two columns:

1. 1=D, 2=C, 3=B, 4=A
2. 1=D, 2=C, 3=A, 4=B
3. 1=t, 2=D, 3=C, 4=A
4. 1=D, 2=A, 3=C, 4=B

Answer: 1. 1=D, 2=C, 3=B, 4=A

Question 16. Terminal and axillary buds arise from:

1. Apical meristem
2. Parenchyma
3. Lateral meristem
4. Intercalary meristem.

Answer: 1. Apical meristem

Question 17. Intercalary meristem is located in:

1. Latex
2. Root
3. Stem tip
4. Petiole and internode.

Answer: 4. Petiole and internode.

Question 18. Which of the following is not a component:

1. Vascular rays
2. Medullary rays.
3. Vessels
4. Tracheids.

Answer: 2. Medullary rays.

Question 19. The primary cell wall is elastic due to the absence of:

1. Suberin
2. Culin
3. Pectin
4. Lignin.

Answer: 4. Lignin.

Question 20. Vessels are found in:

1. All angiosperms
2. Most angiosperms, a few gymnosperms and pteridophytes.
3. All angiosperms and a few gymnosperms
4. Most angiosperms and a few gymnosperms.

Answer: 2. Most angiosperms, a few gymnosperms and pteridophytes.

Question 21. Four radial vascular bundles are formed in:

1. Monocot root
2. Dicot stem
3. Dicot root
4. Monocot stem.

Answer: 3. Dicot root

Question 22. Annual rings are formed basically due to:

1. Marked variations in seasons
2. Different kinds of development of phloem and xylem
3. Uniform climate conditions
4. Different kinds of phloem.

Answer: 1. Marked variations in seasons

Question 23. The commercial use fibres are obtained from:

1. Interxylary fibres
2. Xylem fibres
3. Phloem fibres
4. None of these.

Answer: 3. Phloem fibres

Question 24. Which one of the following tissues does not possess living protoplasm?

1. Collenchyma
2. Sclerenchyma
3. Tracheids
4. Parenchyma.

Answer: 2. Sclerenchyma

Question 25. The chief function of the sieve tube element is:

1. To translocate the organic materials from source to sink
2. To conduct minerals
3. To conduct water from roots to leaves
4. To help the plants in forming wood.

Answer: 1. To translocate the organic materials from source to sink

Question 26. Cambium activity is highest in:

1. Spring
2. Winter
3. Autumn
4. Rains.

Answer: 1. Spring

Question 27. In the leaf, vascular bundles are found in

1. Veins
2. Palisade tissue
3. Upper epidermis
4. Lower epidermis
5. Spongy mesophyll.

Answer: 1. Veins

Question 28. The quiescent centre in the root meristem series is a

1. Site for storage of food which is utilized during maturation
2. Reservoir of growth hormones
3. Reserve for replenishment of damaged calls of the meristem
4. Region for absorption of water.

Answer: 3. Reserve for replenishment of damaged calls of the meristem

Question 29. In a dicotyledonous stem, the sequence of tissues from the outside to the inside is:

1. Phellem – Pericycle – Endodermis – phloem
2. Phellem – Phloem – Endodermis – Pericycle
3. Phellem – Endodermis – Pericycle – Phloem
4. Pericycle – Phellem – Endodermis – Phloem.

Answer: 3. Phellem – Endodermis – Pericycle – Phloem

Question 30. Jute fibres deteriorate because they have:

1. High cellulose
2. Low cellulose
3. High lignin
4. Low lignin.

Answer: 3. High lignin

Question 31. Wood is:

• Primary xylem
• Secondary xylem
• Primary phloem
• Secondary phloem.

Answer: 2. Secondary xylem

Question 32. Cork cambium results in the formation of cork which becomes impermeable to water due to the accumulation of:

1. Resins
2. Suberin
3. Lignins
4. Tannins.

Answer: 2. Suberin

Question 33. Companion cells in plants are associated with:

1. Vessels
2. Sperms
3. Guard cells
4. Sieve elements.

Answer: 4. Sieve elements.

Question 34. In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange will take place through:

1. Lenticels
2. Trichomes
3. Aerenchyma
4. Pneumatophores

Answer: 1. Lenticels

Question 35. In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?

1. Stem and root
2. All parts
3. Shoot tips and root tips
4. Flowers, fruits and leaves.

Answer: 3. Shoot tips and root tips

Question 36. Which of the following statements is not true?

1. Cork cambium is otherwise called phellogen
2. Cork is otherwise called Phellem
3. The secondary cortex is otherwise called the periderm
4. The Cork cambium, cork and secondary cortex are collectively called Phelloderm

1. 3 and 4 only
2. 1 and 2 only
3. 2 and 3 only
4. 2 and 4 only
5. 1 and 4 only.

Answer: 1. 3 and 4 only

Question 37. Bicollateral conjoint vascular bundles have

1. Xylem and phloem, which are arranged alternately on different radii
2. The xylem and phloem, are situated at the same radius and it has two groups of phloem along the two sides of the xylem (inside and outside)
3. Xylem and phloem in the same radius but it has only one group phloem outside the xylem
4. Phloem surrounds the xylem tissues xylem surrounds the Phloem tissues.

Answer: 2. The Xylem and phloem, are situated at the same radius and it has two groups of phloem along the two sides of the xylem (inside and outside)

Question 38. Math the following in column 1 with column 2 and choose the correct combination.

1. 1-D, 2-C, 3-B, 4-A
2. 1-C, 2-B, 3-A, 4-D
3. 1-B, 2-A, 3-4, 4-C
4. 1-A, 2-B, 3-C, 4-D
5. 1-C, 2-D, 3-B, 4-A.

Answer: 5. 1-C, 2-D, 3-B, 4-A.

Question 39. Casparian thickenings are found in the cells of:

1. Pericycle of the root
2. Endodermis of the root
3. Pericycle of the stem
4. Endoermis of the stem.

Answer: 2. Endodermis of the root

Question 40. A portion of apical meristem that gives rise to xylem tissue is called:

1. Protoxylem
2. Metaxylem
3. Procambium
4. Tracheid

Answer: 3. Procambium

Question 41. For a critical study of secondary growth in plants, which one of the following pairs is suitable?

1. Teak and pine
2. Deodar and fern
3. Wheat and maidenhair fern
4. Sugarcane and sunflower.

Answer: 1. Teak and pine

Question 42. Passage cells are thin-walled cells found in:

1. Phloem elements serve as entry points for substances for transport to other plant parts.
2. Testa of seeds to enable the emergence of growing embryonic axis during seed germination.
3. The central region of style through which the pollen tube grows towards the ovary.
4. Endodermis of roots facilitating rapid transport of water from cortex to pericycle.

Answer: 4. Endodermis of roots facilitating rapid transport of water from cortex to pericycle.

Question 43. One of the characteristics of a sieve tube is:

1. It is a part of phloem
2. The function is the transport of inorganic solutes
3. It is a dead cell
4. A sieve plate is not present.

Answer: 1. It is a part of phloem

Question 44. In the following pairs where do you get lignin in both the elements?

1. Tracking and collenchyma
2. Sclerenchyma and sieve tube
3. Sclerenchyma and trachea
4. Parenchyma and endodermis.

Answer: 3. Sclerenchyma and trachea

Question 45. Which of the following statements is true?

1. Uneven thickening of the cell wall is characteristic of sclerenchyma
2. Periblem forms the cortex of the stem and the root
3. Tracheids are the chief water-transporting elements in gymnosperms
4. Companion cells are devoid of the nucleus at maturity
5. The commercial cork is obtained from Quercus suber

1. (1) and (4) only
2. (2) and (3) only
3. (3) and (4) only
4. (1), (2) and (3) only.
5. (2), (3) and(5).

Answer: 5. (2), (3) and(5).

Question 46. The waxy material deposited in the Casparian strip of the endodermis is:

1. Pectin
2. Suberin
3. Cellulose
4. Lignin
5. Hemicellulose.

Answer: 2. Suberin

Question 47. The vascular cambial ring of a dicot stem is:

1. Primary in origin
2. Secondary in origin
3. Embryonic in origin
4. Tertiary in origin
5. Partly primary and partly secondary in origin

Answer: 5. Partly primary and partly secondary in origin

Question 48. Consider the following statements:

1. In a dicot root, the vascular bundles are collateral and endarch
2. The innermost layer of the cortex in a dicot root is the endodermis
3. In a dicot root, the phloem classes are separated from the xylem by parenchymatous cel1s that are known as the conjunctive tissue of these statements given above

1. (1) is true, but (2) and (3) are false
2. (2) is true, but (1) and (3) are false
3. (1) is true, but (2) and (3) are false
4. (3) is true, but (1) and (3) are false
5. (3) is true, but (1) and (2) are false

Answer: 5. (3) is true, but (1) and (2) are false

Question 49. Ground tissue includes:

1. Axe tissues external to endodermis
2. All tissues except the epidermis and vascular bundles
3. Epidermis and cortex
4. All tissues are internal to the endodermis.

Answer: 2. All tissues except the epidermis and vascular bundles

Question 50. The cork cambium, cork and secondary cortex are collectively called:

1. Phelloderm
2. Phellogen
3. Periderm
4. Phellem

Answer: 3. Periderm

Question 51. The common bottle cork is a product of:

1. Pheliogen
2. Xylem
3. Vascular cambium
4. Dermatogen.

Answer: 1. Pheliogen

Question 52. Closed Vascular bundles lack:

1. Conjunctive tissue
2. Cambium
3. Pith
4. Ground tissue

Answer: 2. Cambium

Question 53. Water-containing cavities in vascular bundles are found in:

1. Maize
2. Cycas
3. Pinus
4. Sunflower.

Answer: 1. Maize

Question 54. Companion cells are closely associated with:

1. Vessel elements
2. Trichomes
3. Guard cells
4. Sieve elements.

Answer: 4. Sieve elements.

Question 55. Interfascicular cambium develops from the cells of:

1. Xylem parenchyma
2. Endodermis
3. Pericycle
4. Medullary rays.

Answer: 4. Medullary rays.

Question 56. The age of a tree can be estimated by:

1. Biomass
2. Number of annual rings
3. Diameter of its heartwood
4. Its height and girth

Answer: 2. Number of annual rings

Question 1. The Nerve Fibres that conduct Impulses From The Peripheral To The Central Nervous System Are Called :

1. Motor Nerve Fibres
2. Mixed Nerve Fibres
3. Afferent Nerve Fibres
4. Efferent Nerve Fibres.

Answer: 3. Afferent Nerve Fibres

Question 2. The Nerve Fibres that carry Impulses From The Central Nervous System To The Muscles And Glands For Contraction And Secretion Are Called:

1. Efferent Nerve Fibres
2. Afferent Nerve Fibres
3. Mixed Nerve Fibres
4. Sensory Nerve Fibres.

Answer: 1. Efferent Nerve Fibres

nervous system questions

Question 3. When Sympathetic System Acts On A Particular Organ, Its Action Is :

1. Stimulated
2. Inhibited
3. Transmitted
4. Regulated.

Answer: 4. Regulated.

Question 4. The Simplest Form Of Nervous System That integrates rates of Body Activities Is Found In Cnidarians And Called :

1. Nerve Trunk System
2. Nerve Net System
3. Ladder System
4. Nerve Cord System.

Answer: 2. Nerve Net System

questions about nervous system

Question 5. Excitability And Conductivity Are The Outstanding Properties Of:

1. Arteries
2. Veins
3. Neurons
4. Nephrons.

Answer: 3. Neurons

Question 6. Dendrites Transmit The Impulses To :

1. The Body Of Cell
2. The Neurilemma
3. The Myelin Sheath
4. The Axon Only.

Answer: 1. The Body Of Cell

Question 7. Resting Potential Of Nerve Cells Is :

1. -90 Mv
2. -70-90 Mv
3. -120 Mv
4. -60 M V.

Answer: 2.  -70-90 Mv

Question 8. Nerve Is:

1. Group Of Nerve Fibres Bounded Together By Connective Tissue
2. Group Of Nerve Fibres Bounded By A Membrane
3. A Group Of Neuron Only
4. None Of The Above.

Answer: 2. Group Of Nerve Fibres Bounded By A Membrane

questions about the nervous system

Question 9. Myelinated Fibres Are Nerve Fibres that are:

1. Without Any Surrounding Sheath
2. With A Surrounding Sheath
3. Without Axon
4. None Of The Above.

Answer: 2. With A Surrounding Sheath

Question 10. During Synaptic Transmission Of Nerve Impulse, Neurotransmitter (P) Is Released From Synaptic Vesicles By The Action Of Ions (Q). Choose The Correct P And Q.

1. P = Acetylcholine, Q = Ca^–+
2. P = Acetylcholine Q = Na⁺
3. P = Gaba, Q =Na⁺
4. P = Cholinesterase, Q = Ca⁺⁺.

Answer: 3. P = Gaba, Q =Na+

Question 11. The Transmission Of Nerve Impulse Is A :

1. Mechanical Process
2. Biological Process
3. Electrochemical Process
4. Physical Process.

Answer: 3. Electrochemical Process

Question 12. The Potential Difference’betwecn Inside And Outside Of A Neuron Before Excitation Is Known As :

1. Resting Potential
2. Action Potential
3. Spike Potential
4. Reaction Potential.

Answer: 1. Resting Potential

Question 13. What Is The Difference Between The Conduction Of Electricity Through An Electric wire And That Of Nerve Impulse Through A nerve fibre

1. Nerves Are Living
2. Electricity Provides A Shock
3. Nerve Impulse Is Sell Generated On Stimulation And Propagated
4. All The Above.

Answer: 3. Nerve Impulse Is Sell Generated On Stimulation And Propagated

central nervous system test

Question 14. When Nene Is Stimulated, It Is Polarized. DepolarizaTion Is Maintained By The Following Ion :

1. Ca⁺⁺
2. Cl^–
3. Mg⁺⁺
4. Organic Compounds, K⁺ And Na⁺.

Answer: 4. Organic Compounds, K⁺ And Na⁺.

Question 15. During Resting Conditions The Membrane Of the Axon Is :

1. Impermeable To Na⁺ And K⁺ Ions
2. Permeable To Both Na⁺ And K⁺ Ions
3. More Penncable To K⁺ Than Na⁺ Ions
4. More Permeable To K⁺ And Cl^– Ions.

Answer: 3. More Penncable To K⁺ Than Na⁺ Ions

Question 16. The Tire Part Of Ommatidium That Is Functionally Similar To the Retina Is :

1. Crystalline Cone
2. Basement Membrane
3. Rhabdome
4. Vitrellae.

Answer: 3. Rhabdome

nervous system test

Question 17. The Simplest Form Of Nerve Network Is :

1. Neuron
2. Reflex Arc
3. Peripheral Nervous System
4. Autonomic Nervous System.

Answer: 2. Reflex Arc

Question 18. The Chemical Theory Of Transmission Attributes The Response Of Postsynaptic Cells To A Chemical Substance Released From:

1. Axon
2. Synapse
3. Pre-Synaptic Nerve Terminal
4. Dendrites.

Answer: 3. Pre-Synaptic Nerve Terminal

Question 19. Acetylcholine Is Most Closely Associated With Which Of The Following Systems?

1. Autonomic Nervous System
2. All The Neurons Except Those Of Sympathetic Nervous System
3. Parasympathetic Nervous System
4. Peripheral Nervous System.

Answer: 2. A11 The Neurons Except Those Of Sympathetic Nervous System

Question 20. The Sensory Ganglion Concerned With Spinal Reflex Lies In:

1. Anterior Root Of Spinal Nerve
2. Anterior Hom Of Spinal Nerve
3. Posterior Root Of Spinal Nerve
4. Posterior Hom Of Spinal Cord.

Answer: 3. Posterior Root Of Spinal Nerve

Question 21. Sodium Pump Of An Axon Is Operative At:

1. Action Potential Period
2. Resting Potential Period
3. Refractory Period
4. None Of The Above.

Answer: 1. Action Potential Period

Question 22. The Gap Between the Terminal Knobs Of An Axon And Dendrites Of The Cell Body Of Another Axon Is Known As:

1. Synaptic Cleft
2. Synapse
3. Neural Crest
4. Tight Junction.

Answer: 1. Synaptic Cleft

Question 23. Acetylcholine Is :

1. Secreted  By Nerve Cells In Synapse
2. Produced By Liver
3. A Delivery Enzyme
4. Activates Enzymes.

Answer: 1. Produced By Liver

Question 24. Action Potential Is :

1. Brief Change In Electric Charge
2. Brief Change In Oxygen Concentration
3. Brief Change In C0₂ Concentration
4. Change In Direction Of Nerve.

Answer: 1. Brief Change In Electric Charge

Question 25. During the Refractory Period :

1. Nerve Transmits Impulses Rapidly
2. Nerve Transmits Impulses Very Slowly
3. Nerve Never Transmits Impulses
4. None Of The Above.

Answer: 3. Nerve Never Transmits Impulses

Question 26. Electrical Impulse Of The Eye Recorded Are :

1. Encephalogram
2. Electro-Cardiogram
3. Electro-Retinogram
4. None Of The Above.

Answer: 3. Electro-Retinogram

Question 27. Neurotransmitters Are Compounds That:

1. Help In Transmission Of Impulse In Synapse
2. Retard The Transmission Of Impulse In An Axon
3. Retard The Transmission Of Impulse At Synapsis
4. None Of The Above.

Answer: 1. Help In Transmission Of Impulse In Synapse

Question 28. The 3rd, 6th And 11th Cranial Nerves Are :

1. Oculomotor, Trigeminal, Spinal
2. Optic, Facial, Spinal
3. Oculomotor, Abducens, Spinal
4. Trochlear, Abducens, Vagus.

Answer: 3. Oculomotor, Abducens, Spinal

Question 29. Which Of The Following Cranial Nerves Is Present In Rabbit But Absent In Frog?

1. Glossopharyngeal
2. Hypoglossal
3. Olfactory
4. Optic

Answer: 2. Olfactory

Question 30. Nervous System Was, First Of All, Originated In :

1. Leech
2. Ascaris
3. Hydra
4. Tape Worm.

Answer: 3. Hydra

Question 31. Sympathetic Nerves In Mammals Arise From :

1. Thoraco-Lumbar Nerves
2. 3^rd, 7^th, 9^th And 10^th Cranial Nerves
3. Sacral Nerves
4. Cervical Nerves.

Answer: 1. Thoraco-Lumbar Nerves

Question 32. At The Nerve Synapse :

1. Carbon Dioxide Is Released
2. Oxygen Is Released
3. Neuro-Transmitters Are Released
4. Nothing Is Released.

Answer: 3. Neuro-Transmitters Are Released

Question 33. At The Nerve Cell Membrane, The Equilibrium Potential For Potassium Is :

1. + 65 M V
2. +35m V
3. -90 M V
4. -70 M V

Answer: 3. -90 M V

Question 34. The “Spike” Phase Of Action Potential Lasts For Roughly :

1. 20 Milli Second
2. 2 Milli Second
3. 200 Milli Second
4. 2000 Milli Second.

Answer: 2. 2 Milli Second

Question 35.The Chemical Thcoiy Of Ti.Msmissiou Iillrilnitcs The Response Of Postsvnaptic Coll To A Chemical Substance Released Item :

1. Axon
2. Synapse
3. Pre-Synaptic Nerve Terminal
4. Dendrites.

Answer: 3. Pre-Synaptic Nerve Terminal

Question 36. One None Is Stimulated, It Is Polarized. Depolarization Is Maintained By The Following Ion :

1. Ca⁺
2. Cl^–
3. Mg⁺⁺
4. K⁺.

Answer: 4. K⁺.

Question 37. During Resting Conditions The Membrane Of the Axon Is:

1. Impermeable To Na⁺ And K⁺ Ion
2. Permeable To Both Na⁺ And K⁺ Ions
3. More Penncable To K⁺ Than Na⁺ Ion
4. More Permeable To K⁺ And Cl^– Ions.

Answer: 3. More Penncable To K⁺ Than Na⁺ Ion

Question 38. Conduction Of Nerve Impulse Along A Myelinated Nerve Is :

1. Twisted
2. Reversible
3. Saltatory
4. Continuous.

Answer: 3. Saltatory

Question 39. Somaesthetic Area Is Located In :

1. Frontal Lobe
2. Mid Lobe
3. Parietal Lobe
4. None.

Answer: 3. Parietal Lobe

Question 40. The Ends Of Bipolar Neurons In Retina Of Man Touch :

1. Choroid Layer And Ganglion Cells
2. Photosensitive Cells And Ganglion Cells
3. Cornea And Retina
4. Blind Spot And Yellow Spot.

Answer: 2. Photosensitive Cells And Ganglion Cells

Question 41. Glands Of Swammerdam Are Rich In :

1. Calcium
2. Acetylcholine
3. Dopamine
4. Gonadotrophin.

Answer: 1. Calcium

Question 42. Sensory Neuron In A Vertebrate Reflex Are Located In :

1. Grey Matter Of Spinal Cord
2. White Matter Of Spinal Cord
3. Ventral Root Ganglion
4. Dorsal Root Ganglion.

Answer: 4. Dorsal Root Ganglion.

Question 43. Which One Of The Following Nerves Is Not Related To The Movement Of Eye Ball?

1. Oculomotor
2. Abducens
3. Trochlear
4. Glossopharyngeal.

Answer: 4. Glossopharyngeal.

Question 44. The Benzodiazepine Drug Known As Valium Produces Relaxation By Aiding The Binding To Receptor Proteins Of Inhibitory Neurotransmitters:

1. Ach
2. Gaba
3. Dopamine
4. Glycine.

Answer: 2. Gaba

Question 45. Which One Of The Following Is The Effect Of Parasympathetic Nervous System?

1. Increasing Blood Pressure
2. Secretion Of Digestive Juice
3. Dilating Pupil
4. Increasing Cardiac Output.

Answer: 2. Secretion Of Digestive Juice

Question 46. Which Of The Following Is the Function Of Pons Varolii?

1. Site Of Cardiac Centre
2. Perceiving Centre For Crude Sensation
3. Controls Hunger And Thirst
4. Transmits Impulses From One Side Of Ceubellum To The Other Side.

Answer: 4. Transmits Impulses From One Side Of Ceubellum To The Other Side.

Question 47. The Cervical Plexus Is Formed By

1. Anterior Rami Of First Two Cervical Nerves
2. Anterior Rami Of First Three Cervical Nerves
3. Anterior Rami Of First Two Cervical And First Two Thoracic Nerves
4. Anterior Rami Of Hist Four Cervical Nerves.

Answer: 4. Anterior Rami Of First Two Cervical And First Two Thoracic Nerves

Question 48. Presynaptic Membrane Permits :

1. Influx Of Na⁺ Ions
2. Influx Of Ca^+₃  Ions
3. Influx Of Na⁺ And K⁺ Ions
4. Start Of Original Impulse.

Answer: 2. Influx Of Ca^+₂ Ions

Question 49. Heart Beat Is Regulated By :

1. Cns
2. Ans
3. PNS
4. Spinal Cord.

Answer: 2. Ans

Question 50. Brain Reserves How Many Percent Of Total 0₂ Consumed By Body?

1. 10%
2. 20%
3. 30%
4. 40%.

Answer: 2. 20%

Question 51. The Refractory Centre Which Rfor Exampleulates Respiration Is Located In :

1. Medulla Oblongata
2. Cerebral Peduncle
3. Vagus Nerve
4. Cerebellum.

Answer: 1. Medulla Oblongata

Question 52. Which Brain Structure In Rabbit Is Directly Vision Related ?’

1. Hippocampus
2. Corpus Callosum
3. Corpus Albicans
4. Corpora Quadrigeminum.

Answer: 4. Corpora Quadrigeminum

Question 53. Most Of The Neurons Of Our Body Are :

1. Unipolar
2. Bipolar
3. Pseudo-Unipolar
4. Multipolar.

Answer: 4. Multipolar.

Question 54. Body Coordination Is Exhibited By :

1. Blood Vascular System
2. Nervous System
3. Endocrine System
4. Nervous And Endocrine System.

Answer: 4. Nervous And Endocrine System.

Question 55. The Sodium-Potassium Pump :

1. Transports Na⁺ And K⁺ Out Of The Neuron
2. Transports Na⁺ Into The Neuron And K⁺ Out
3. Transports K⁺ Into The Neuron And Na⁺ Out
4. Transports Na⁺ And K⁺ Into The Neuron.

Answer: 3. Transports K⁺ Into The Neuron And Na⁺ Out

Question 56. When A Neuron Shows A Stable Resting Potential, The Concentration Of Na⁺ Is :

1. 10 Times Higher Inside The Cell Than Outside
2. 10 Times Higher Outside The Cell Than Inside
3. 30 Times Higher Inside The Cell Than Outside
4. 30 Times Higher Outside The Cell Than Inside.

Answer: 2. 10 Times Higher Outside The Cell Than Inside

Question 57. In The Resting State Of The Neural Membrane, Diffusion Due To Concentration Gradients, If Allowed, Would Drive

1. Na⁺ Into The Cell
2. Na⁺ Out Of The Cell
3. K⁺ Into The Cell
4. K⁺ And Na⁺ Out Of The Cell.

Answer: 1. Na⁺ Into The Cell

Question 58. The Resting Potential Of Neurons Is  70 Mv. It Is Mainly Due To :

1. Excess Of Chloride Ions Inside
2. Excess Of Protein Ions Inside
3. Na+ Ions Outside
4. K⁺ Ions Inside.

Answer: 3. Na⁺ Ions Outside

Question 59. A Nerve Impulse Which Travels Through Nerve Fibre Only It Its Membrane Suddenly Becomes More Permeable To Ions Of:

1. Chloride
2. Potassium (K⁺)
3. Sodium (Na⁺)
4. Magnesium (Mg⁺⁺).

Answer: 3. Sodium (Na⁺)

Question 60. An Action Potential, For A Given Axon, Is:

1. Different In Size Each Time It Occurs
2. Always The Same Size
3. Larger When Information Has To Be Conveyed Faster
4. Smaller When Information Goes To A Gland Rather Than  A Muscle.

Answer: 2. Always The Same Size

Question 61. Which Of The Following Increases When An Action Potential Is Initiated?

1. Diffusion Of Sodium Ions Into The Neuron
2. Diffusion Of Sodium Ions Out Of The Neuron
3. Diffusion Of Potassium Ions Out Of The Neuron
4. Diffusion Of Potassium Ions Into The Neuron.

Answer: 1. Diffusion Of Sodium Ions Into The Neuron

Question 62. When An Action Potential Abruptly Drops From Positive To Nfor Exampleative, This Is Because :

1. Potassium Gates Are Inactivated And Sodium Gates Are Opened
2. Sodium Gates Are Inactivated And Potassium Gates Are Opened
3. Both Potassium And Sodium Gates Are Inactivated
4. Both Potassium And Sodium Gates Are Opened.

Answer: 2. Sodium Gates Are Inactivated And Potassium Gates Are Opened

Question 63. A Nerve Impulse Leaves A Neuron Via :

1. Dendrite
2. Cyton
3. Axon
4. Nucleus.

Answer: 3. Axon

Question 64. Synapse Is A Gap Between Adjacent :

1. Muscle Fibres
2. Nerve Cells
3. Nerve Cell Bodies
4. None Of The Above.

Answer: 2. Nerve Cells

Question 65. A Nerve Which Conveys Impulses From A Tissue To Nerve Centre Is Called :

1. Efferent
2. Mixed
3. Motor
4. Afferent.

Answer: 4. Afferent.

Question 66. The “Spike” Phase Of The Action Potential Lasts For Roughly :

1. 2 Milliseconds
2. 20 Milliseconds
3. 200 Milliseconds
4. 2000 Milliseconds.

Answer: 1. 2 Milliseconds

Question 67. The Speed At Which Impulses Are Conducted Increases With :

1. Increasing the Diameter Of The Soma
2. Increasing the Diameter Of The Axon
3. Increasing Number Of Dendrites
4. Increasing Branching Of The Dendrites.

Answer: 2. Increasing the Diameter Of The Axon

Question 68. Saltatory Conduction Of Nerve Impulses Occurs In :

1. A myelinated Fibres
2. Myelinated Fibres
3. Both A And B
4. None Of The Above.

Answer: 2. Myelinated Fibres

Question 69. Synaptic Fatigue Is Due To :

1. Exhaustion Of Neurotransmitter
2. Release Of More Adrenaline
3. Release Of More Acetylcholine
4. None Of The Above.

Answer: 1. Exhaustion Of Neurotransmitter

Question 70. Secretion Of Parasympathetic Nerve Endings Is :

1. Noradrenaline
2. Glycine
3. Acetylcholine
4. Hydroxy-Triptamine.

Answer: 3. Acetylcholine