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NEET ]1[ Contd...

NEET Biology - Neural Control and Coordination

Duration: 83 minutesTotal Marks: 332Questions: 83Negative Marking: -1

Instructions:

Each question has four options (1), (2), (3), (4). Choose the most correct answer.
Each correct answer carries 4 marks.
Each wrong answer will deduct 1 marks.
Unanswered questions will not be penalised.

1.Which statement gives the most NCERT-accurate meaning of coordination in the context of neural control?

(1)One organ independently maintains its own activity without affecting others.

(2)Two or more organs interact and complement one another’s functions to maintain homeostasis.

(3)Only the endocrine system chemically integrates all activities during stress.

(4)Only the neural system controls all organs through hormones.

2.During physical exercise, which statements correctly represent the coordination described in the chapter?
A. Energy demand increases for muscular activity.
B. Oxygen supply must increase, so respiration rate, heart beat and blood flow increase.
C. Kidney activity permanently stops during exercise.
D. After exercise stops, organs gradually return to normal conditions.

(1)A, B and D only

(2)A and C only

(3)B, C and D only

(4)A, B, C and D

3.Assertion (A): The neural system provides quick coordination through an organised point-to-point network.

Reason (R): The endocrine system provides chemical integration through hormones.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

4.Match List I with List II.
List I: a. Hydra b. Insects c. Vertebrates d. Neurons
List II: i. More developed neural system ii. Network of neurons iii. Brain with ganglia and neural tissues iv. Detect, receive and transmit stimuli

(1)a-ii, b-iii, c-i, d-iv

(2)a-iii, b-ii, c-i, d-iv

(3)a-ii, b-i, c-iii, d-iv

(4)a-iv, b-iii, c-i, d-ii

5.Which option correctly distinguishes CNS and PNS as described in the uploaded chapter?

(1)CNS includes all body nerves; PNS includes brain and spinal cord.

(2)CNS is the site of information processing and control; PNS comprises nerves associated with the CNS.

(3)CNS contains only the brain; PNS contains only the spinal cord.

(4)CNS and PNS are both composed only of ganglia.

6.Choose the correct statement(s) about PNS nerve fibres.
A. Afferent fibres carry impulses from tissues/organs to CNS.
B. Efferent fibres carry regulatory impulses from CNS to peripheral tissues/organs.
C. Afferent fibres carry impulses only from CNS to skeletal muscles.
D. Efferent fibres carry impulses only from viscera to CNS.

(1)A and B only

(2)C and D only

(3)A, B and C only

(4)A, B, C and D

7.Which pair is correctly matched?

(1)Somatic neural system — involuntary organs and smooth muscles

(2)Autonomic neural system — skeletal muscles

(3)Somatic neural system — CNS to skeletal muscles

(4)Parasympathetic neural system — a division of the somatic neural system

8.The visceral nervous system is best described as the part of PNS that includes:

(1)only spinal cord and brain stem.

(2)only cranial nerves connecting sensory organs.

(3)nerves, fibres, ganglia and plexuses carrying impulses between CNS and viscera.

(4)only motor fibres to skeletal muscles.

9.A neuron is described in the chapter as being made of three major parts. Which set is correct?

(1)Cell body, dendrites and axon

(2)Axon, synaptic cleft and thalamus

(3)Cell body, myelin sheath and corpus callosum

(4)Dendrite, medulla and pons

10.Identify the correct statement(s) about Nissl’s granules and dendrites.
A. Cell body contains Nissl’s granules.
B. Dendrites also contain Nissl’s granules.
C. Dendrites transmit impulses away from the cell body.
D. Dendrites are short fibres that branch repeatedly.

(1)A, B and D only

(2)A and C only

(3)B, C and D only

(4)A, B, C and D

11.Which direction pairing is correct?

(1)Dendrites away from cell body; axon towards cell body

(2)Dendrites towards cell body; axon away from cell body

(3)Both dendrites and axon only towards cell body

(4)Both dendrites and axon only away from cell body

12.Which statements are correct?
A. Axon has a branched distal end.
B. Each branch terminates in a synaptic knob.
C. Synaptic vesicles in knobs contain neurotransmitters.
D. Axons transmit impulses only towards the cell body.

(1)A, B and C only

(2)B and D only

(3)A, C and D only

(4)A, B, C and D

13.Match the neuron type with its feature/location.
a. Multipolar b. Bipolar c. Unipolar
i. Retina of eye ii. Embryonic stage iii. Cerebral cortex

(1)a-iii, b-i, c-ii

(2)a-i, b-iii, c-ii

(3)a-ii, b-i, c-iii

(4)a-iii, b-ii, c-i

14.A neuron with one axon and two or more dendrites is called:

(1)Bipolar

(2)Unipolar

(3)Multipolar

(4)Non-myelinated

15.Choose the correct statements.
A. Myelinated fibres are enveloped by Schwann cells that form myelin sheath.
B. Nodes of Ranvier are gaps between adjacent myelin sheaths.
C. Myelinated nerve fibres are found in spinal and cranial nerves.
D. Unmyelinated fibres lack Schwann cell enclosure.

(1)A, B and C only

(2)A and D only

(3)B, C and D only

(4)A, B, C and D

16.Nodes of Ranvier are:

(1)bulb-like ends of axon branches.

(2)gaps between two adjacent myelin sheaths.

(3)granular bodies in dendrites.

(4)fluid-filled gaps between synaptic membranes.

17.Which of the following is NOT correct for a resting neuron?

(1)The membrane is polarised.

(2)Ion channels are selectively permeable.

(3)Axonal membrane is comparatively more permeable to K+.

(4)Axonal membrane is freely permeable to Na+ at rest.

18.In a resting axon, which arrangement is correct?
A. Axoplasm has high K+.
B. Axoplasm has low Na+.
C. Outside fluid has high Na+.
D. Outside fluid has high K+.

(1)A, B and C only

(2)A and D only

(3)B, C and D only

(4)A, B, C and D

19.The sodium-potassium pump maintains resting ionic gradients by transporting:

(1)2 Na+ outward and 3 K+ inward

(2)3 Na+ outward and 2 K+ inward

(3)3 K+ outward and 2 Na+ inward

(4)Equal numbers of Na+ and K+ in opposite directions

20.Resting potential is the electrical potential difference across the:

(1)stimulated plasma membrane after Na+ influx.

(2)resting plasma membrane.

(3)synaptic cleft after neurotransmitter release.

(4)myelin sheath at a node of Ranvier only.

21.At stimulated site A of a polarised axonal membrane, which statements are correct?
A. Membrane becomes freely permeable to Na+.
B. Na+ influx causes reversal of polarity.
C. Outer surface becomes positive and inner side negative.
D. The electrical potential difference at site A is action potential.

(1)A, B and D only

(2)A and C only

(3)B, C and D only

(4)A, B, C and D

22.According to the chapter, action potential is in fact termed as:

(1)resting potential

(2)synaptic cleft

(3)nerve impulse

(4)myelin sheath

23.During impulse conduction from site A to site B, select the correct statement(s).
A. Site B initially has positive charge outside and negative charge inside.
B. Current flows on the inner surface from A to B.
C. Current flows on the outer surface from B to A.
D. Action potential generated at B means the impulse has arrived at B.

(1)A, B, C and D

(2)A and B only

(3)B and C only

(4)A, C and D only

24.After the short-lived rise in Na+ permeability at an excited membrane site, the next event restoring responsiveness is:

(1)K+ permeability rises; K+ diffuses outside; resting potential is restored.

(2)Na+ continues to enter indefinitely; the membrane stays depolarised.

(3)Negatively charged proteins leave axoplasm to restore resting potential.

(4)Neurotransmitters bind the myelin sheath and close all ion channels.

25.Assertion (A): At rest, the outer surface of the axonal membrane is positive while the inner surface is negative.

Reason (R): The sodium-potassium pump maintains ionic gradients by transporting 3 Na+ outward and 2 K+ inward.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

26.Junctions through which a nerve impulse is transmitted from one neuron to another are called:

(1)nodes of Ranvier

(2)synapses

(3)corpora quadrigemina

(4)cranial meninges

27.Which statements are correct about synapses?
A. Synapse is formed by pre-synaptic and post-synaptic neuron membranes.
B. A synaptic cleft may or may not separate these membranes.
C. Electrical and chemical synapses are two types of synapses.
D. Every synapse must have a fluid-filled cleft.

(1)A, B and C only

(2)A and D only

(3)B and D only

(4)A, B, C and D

28.Which statement is INCORRECT about electrical synapses?

(1)Pre- and post-synaptic membranes are in very close proximity.

(2)Electrical current can flow directly from one neuron to another.

(3)Transmission is always slower than chemical synapses.

(4)Electrical synapses are rare in the human system.

29.Which is the correct sequence at a chemical synapse?
A. Action potential reaches axon terminal.
B. Synaptic vesicles move towards and fuse with plasma membrane.
C. Neurotransmitters are released into synaptic cleft.
D. Neurotransmitters bind receptors on post-synaptic membrane.
E. Ion channels open and new potential may develop.

(1)A → B → C → D → E

(2)A → C → B → D → E

(3)B → A → D → C → E

(4)D → C → A → B → E

30.At a chemical synapse, the space separating pre- and post-synaptic membranes is:

(1)node of Ranvier

(2)synaptic cleft

(3)cerebral aqueduct

(4)corpus callosum

31.Neurotransmitters at chemical synapses are:

(1)ions pumped outward by sodium-potassium pump.

(2)chemicals stored in synaptic vesicles and released into synaptic cleft.

(3)proteins that make the axoplasm impermeable.

(4)myelin sheath components secreted by Schwann cells.

32.Assertion (A): Electrical synapses are faster than chemical synapses.

Reason (R): At electrical synapses, current can flow directly from one neuron to another.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

33.After neurotransmitter-receptor binding on the post-synaptic membrane, the new potential generated may be:

(1)only excitatory

(2)only inhibitory

(3)either excitatory or inhibitory

(4)neither excitatory nor inhibitory

34.Which functions are included under brain control/processing in the chapter?
A. Voluntary movements and balance
B. Thermoregulation, hunger and thirst
C. Circadian rhythms and endocrine gland activities
D. Vision, hearing, speech, memory, intelligence, emotions and thoughts

(1)A, B and C only

(2)B and D only

(3)A, C and D only

(4)A, B, C and D

35.Correct order of cranial meninges from outer to inner is:

(1)Pia mater → arachnoid → dura mater

(2)Dura mater → arachnoid → pia mater

(3)Arachnoid → dura mater → pia mater

(4)Dura mater → pia mater → arachnoid

36.Match List I with List II.
a. Forebrain b. Hindbrain c. Whole brain major divisions
i. Pons, cerebellum and medulla ii. Cerebrum, thalamus and hypothalamus iii. Forebrain, midbrain and hindbrain

(1)a-ii, b-i, c-iii

(2)a-i, b-ii, c-iii

(3)a-iii, b-i, c-ii

(4)a-ii, b-iii, c-i

37.The major part of the human brain is formed by the:

(1)pons

(2)cerebrum

(3)medulla oblongata

(4)corpora quadrigemina

38.Choose the correct statements about cerebrum.
A. A deep cleft divides cerebrum longitudinally into left and right cerebral hemispheres.
B. Corpus callosum connects the two cerebral hemispheres.
C. Cerebral cortex covers the cerebral hemisphere and is thrown into folds.
D. Corpus callosum is a canal passing through the midbrain.

(1)A, B and C only

(2)A and D only

(3)B, C and D only

(4)A, B, C and D

39.Cerebral cortex is referred to as grey matter because:

(1)myelin sheath makes it opaque white.

(2)neuron cell bodies are concentrated there.

(3)it has a fluid-filled synaptic cleft.

(4)it is made of fibre tracts interconnecting brain regions.

40.Association areas of the cerebral cortex are responsible for:

(1)only respiration and gastric secretions.

(2)intersensory associations, memory and communication.

(3)only transmission of impulses to skeletal muscles.

(4)secretion of hypothalamic hormones only.

41.White matter gets its opaque white appearance mainly because fibres of tracts are covered with:

(1)Nissl’s granules

(2)neurotransmitters

(3)myelin sheath

(4)synaptic cleft fluid

42.The thalamus is described as a major coordinating centre for:

(1)respiration and gastric secretion

(2)sensory and motor signalling

(3)sexual behaviour and fear only

(4)myelin sheath formation

43.Identify correct statements about hypothalamus.
A. It lies at the base of the thalamus.
B. It has centres controlling body temperature and urges for eating and drinking.
C. It has neurosecretory cells that secrete hypothalamic hormones.
D. It is the canal passing through midbrain.

(1)A, B and C only

(2)A and D only

(3)B, C and D only

(4)A, B, C and D

44.Which combination correctly describes the limbic system as given in the chapter?

(1)Outer dura mater + arachnoid; involved in brain protection.

(2)Inner cerebral hemispheres + amygdala/hippocampus; with hypothalamus regulates sexual behaviour, emotions and motivation.

(3)Pons + medulla; controls respiration and gastric secretion.

(4)Corpora quadrigemina + cerebral aqueduct; controls eating and drinking.

45.The midbrain is located between:

(1)pons and medulla only

(2)thalamus/hypothalamus of forebrain and pons of hindbrain

(3)cerebrum and corpus callosum

(4)spinal cord and medulla only

46.The dorsal portion of midbrain mainly consists of:

(1)two oval thalami

(2)four round swellings called corpora quadrigemina

(3)three cranial meninges

(4)one corpus callosum

47.Match hindbrain part with its description.
a. Pons b. Cerebellum c. Medulla
i. Centres for respiration, cardiovascular reflexes and gastric secretions
ii. Fibre tracts interconnecting brain regions
iii. Very convoluted surface for more neurons

(1)a-ii, b-iii, c-i

(2)a-i, b-ii, c-iii

(3)a-iii, b-i, c-ii

(4)a-ii, b-i, c-iii

48.Which of the following is controlled by centres present in medulla?

(1)Intersensory association only

(2)Respiration, cardiovascular reflexes and gastric secretions

(3)Body temperature and thirst only

(4)Visual, tactile and auditory inputs only

49.Brain stem is made up of:

(1)cerebrum, thalamus and hypothalamus

(2)midbrain, pons and medulla oblongata

(3)pons, cerebellum and corpus callosum

(4)dura mater, arachnoid and pia mater

50.Assertion (A): Brain stem forms connections between the brain and spinal cord.

Reason (R): Brain stem consists of midbrain, pons and medulla oblongata.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

51.According to the chapter summary, which statements are correct?
A. Midbrain receives and integrates visual, tactile and auditory inputs.
B. Cerebellum integrates information from semicircular canals of the ear and auditory system.
C. Cerebellum is listed as a part of forebrain.
D. Midbrain comprises pons, cerebellum and medulla.

(1)A and B only

(2)A, B and C only

(3)C and D only

(4)A, B, C and D

52.A labelled neuron diagram shows a short repeatedly branched fibre emerging from the cell body and another long fibre ending in bulb-like structures. Which option correctly identifies their functions?

(1)Short branched fibre carries impulses away; bulb-like ends contain hypothalamic hormones.

(2)Short branched fibre carries impulses towards cell body; bulb-like synaptic knobs contain vesicles with neurotransmitters.

(3)Long fibre is dendrite; it carries impulses towards the cell body.

(4)Bulb-like ends are nodes of Ranvier and contain Nissl’s granules.

53.In the impulse conduction diagram, site A is stimulated while site B is immediately ahead. Which statement best matches the diagrammatic polarity change?

(1)A remains resting while B is depolarised first.

(2)At A, Na+ influx reverses polarity; local current on inner surface flows A to B and helps generate action potential at B.

(3)At B, K+ influx first makes the outside negative.

(4)Current flows on both inner and outer surfaces from A to B only.

54.In an axon terminal-synapse diagram, which label/event order is correct for chemical transmission?

(1)Post-synaptic receptor → vesicle fusion → action potential arrival → neurotransmitter release

(2)Action potential arrival → vesicle movement/fusion → neurotransmitter release → receptor binding → ion channel opening

(3)Ion channel opening → neurotransmitter storage → vesicle fusion → action potential arrival

(4)Synaptic cleft closes → electrical current directly enters the next neuron → receptor binding

55.In a sagittal section of human brain, which region-wise grouping is correct?

(1)Forebrain: pons, cerebellum, medulla; Hindbrain: cerebrum, thalamus, hypothalamus

(2)Forebrain: cerebrum, thalamus, hypothalamus; Hindbrain: pons, cerebellum, medulla

(3)Midbrain: cerebrum and corpus callosum; Hindbrain: meninges only

(4)Forebrain: dura, arachnoid, pia; Hindbrain: amygdala and hippocampus only

56.Assertion (A): Cerebral cortex is called grey matter.

Reason (R): Fibres of tracts covered with myelin sheath give the inner layer an opaque white appearance.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

57.Which is NOT correctly matched?

(1)Hypothalamus — body temperature control

(2)Hypothalamus — neurosecretory cells secreting hypothalamic hormones

(3)Limbic system with hypothalamus — regulation of sexual behaviour and emotional reactions

(4)Limbic system — formation of myelin sheath around axons

58.Assertion (A): Nodes of Ranvier are seen in myelinated nerve fibres.

Reason (R): They are gaps between two adjacent myelin sheaths.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

59.Match List I with List II.
a. Resting state b. Stimulated site c. Action potential d. Repolarisation
i. Electrical potential difference at stimulated site ii. More permeable to K+, nearly impermeable to Na+ iii. Free permeability to Na+ begins iv. K+ diffuses outside restoring resting potential

(1)a-ii, b-iii, c-i, d-iv

(2)a-iii, b-ii, c-i, d-iv

(3)a-ii, b-i, c-iii, d-iv

(4)a-iv, b-iii, c-i, d-ii

60.Which of the following is NOT assigned to the brain in the chapter?

(1)Processing of vision and hearing

(2)Control of voluntary movements and balance

(3)Thermoregulation and hunger-thirst control

(4)Formation of Nissl’s granules in dendrites as a command-control function

61.Select the fully correct set about PNS divisions.
A. Somatic system relays impulses from CNS to skeletal muscles.
B. Autonomic system transmits impulses from CNS to involuntary organs and smooth muscles.
C. Autonomic system is divided into sympathetic and parasympathetic systems.
D. Visceral nervous system is part of the central neural system.

(1)A, B and C only

(2)A and D only

(3)B, C and D only

(4)A, B, C and D

62.Assertion (A): Afferent fibres carry impulses from tissues/organs to CNS.

Reason (R): Efferent fibres carry regulatory impulses from CNS to concerned peripheral tissues/organs.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

63.A synapse has a fluid-filled cleft and uses neurotransmitters. It should be classified as:

(1)electrical synapse

(2)chemical synapse

(3)node of Ranvier

(4)visceral plexus

64.Which statements are correct?
A. Nissl’s granules occur in the cell body.
B. Dendrites contain Nissl’s granules.
C. Synaptic vesicles contain neurotransmitters.
D. Hypothalamic neurosecretory cells secrete neurotransmitters called hypothalamic hormones.

(1)A, B and C only

(2)A, C and D only

(3)B, C and D only

(4)A, B, C and D

65.A canal called the cerebral aqueduct passes through the:

(1)forebrain

(2)midbrain

(3)hindbrain only

(4)cranial meninges

66.Which structure is NOT listed as a brain stem component in the chapter?

(1)Midbrain

(2)Pons

(3)Medulla oblongata

(4)Cerebellum

67.Match structures with functions.
a. Association areas b. Thalamus c. Hypothalamus d. Medulla
i. Sensory and motor signalling coordination ii. Intersensory associations, memory and communication iii. Body temperature, eating and drinking urges iv. Respiration, cardiovascular reflexes and gastric secretions

(1)a-ii, b-i, c-iii, d-iv

(2)a-i, b-ii, c-iv, d-iii

(3)a-ii, b-iii, c-i, d-iv

(4)a-iv, b-i, c-iii, d-ii

68.Assertion (A): Left and right cerebral hemispheres are connected.

Reason (R): A tract of nerve fibres called corpus callosum connects them.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

69.Which statement links the chapter’s myelin facts correctly?

(1)Schwann cells form myelin sheath around myelinated axons; myelin-covered tract fibres give white matter its opaque appearance.

(2)Nissl’s granules form myelin sheath; myelin causes grey matter colour.

(3)Synaptic cleft fluid forms myelin sheath; white matter is made only of cell bodies.

(4)Myelin sheath is secreted by hypothalamic cells and only occurs in the medulla.

70.The hypothalamus lies:

(1)at the base of the thalamus

(2)inside the synaptic cleft

(3)between pons and medulla

(4)around every axon

71.Choose the correct comparison.
A. Polarised resting membrane: outside positive, inside negative.
B. Depolarised stimulated site: outside negative, inside positive.
C. Restoration of resting potential involves K+ diffusing outside.
D. Depolarisation is caused by K+ leaving first.

(1)A, B and C only

(2)A and D only

(3)B and D only

(4)A, B, C and D

72.Which statement correctly contrasts electrical and chemical synapses?

(1)In electrical synapse, membranes are separated by a fluid-filled synaptic cleft; in chemical synapse, current flows directly.

(2)In electrical synapse, membranes are very close and current flows directly; in chemical synapse, membranes are separated by a fluid-filled cleft.

(3)Both electrical and chemical synapses always lack any membrane separation.

(4)Chemical synapse is always faster because neurotransmitters flow directly as electrical current.

73.Which statement about cerebellum is supported by the chapter?

(1)It has a very convoluted surface for more neurons and integrates information from semicircular canals and auditory system.

(2)It is the major coordinating centre for sensory and motor signalling.

(3)It contains centres for gastric secretions.

(4)It lies at the base of thalamus.

74.Assertion (A): Neurotransmitter binding can generate a new potential in the post-synaptic neuron.

Reason (R): Binding opens ion channels and allows entry of ions.

(1)Both A and R are true, and R is the correct explanation of A.

(2)Both A and R are true, but R is not the correct explanation of A.

(3)A is true, but R is false.

(4)A is false, but R is true.

75.The autonomic neural system is further classified into:

(1)afferent and efferent systems

(2)somatic and visceral systems

(3)sympathetic and parasympathetic systems

(4)forebrain and hindbrain systems

76.Which chapter-summary statements are correct?
A. Neurons are functional units of neural system.
B. Neurons are excitable due to a differential concentration gradient of ions across the membrane.
C. Resting potential is the electrical potential difference across the resting neural membrane.
D. Neurotransmitters are chemicals involved at chemical synapses.

(1)A, B, C and D

(2)A and C only

(3)B and D only

(4)A, B and D only

77.Which pair is incorrectly matched?

(1)Multipolar — cerebral cortex

(2)Bipolar — retina of eye

(3)Unipolar — usually embryonic stage

(4)Bipolar — one axon and two or more dendrites

78.Which statements are correct?
A. Human brain is protected by skull.
B. Dura mater is the outer meningeal layer.
C. Arachnoid is very thin and middle layer.
D. Pia mater is inner layer in contact with brain tissue.

(1)A, B, C and D

(2)A and B only

(3)B, C and D only

(4)A, C and D only

79.Match the term with its best description.
a. Synapse b. Synaptic cleft c. Neurotransmitter d. Post-synaptic receptor
i. Chemical involved in transmission at chemical synapse
ii. Junction for neuron-to-neuron impulse transfer
iii. Specific binding site on post-synaptic membrane
iv. Fluid-filled space in chemical synapse

(1)a-ii, b-iv, c-i, d-iii

(2)a-iv, b-ii, c-i, d-iii

(3)a-ii, b-i, c-iv, d-iii

(4)a-iii, b-iv, c-i, d-ii

80.A nerve fibre becomes once more responsive to further stimulation after:

(1)Na+ permeability remains permanently high.

(2)K+ diffuses outside and restores resting potential.

(3)neurotransmitters accumulate in axoplasm.

(4)the corpus callosum connects both hemispheres.

81.Pons consists mainly of:

(1)fibre tracts that interconnect different regions of brain

(2)neurosecretory cells secreting hypothalamic hormones

(3)four round swellings called corpora quadrigemina

(4)outer cranial meninges

82.The chapter describes the brain as the body’s:

(1)chemical integration gland only

(2)central information processing organ and command-control system

(3)network of neurons like Hydra

(4)fluid-filled synaptic cleft

83.Which topic is explicitly included in this chapter’s stated scope?

(1)Mechanism of neural coordination such as transmission of nerve impulse and impulse conduction across a synapse

(2)Detailed classification of endocrine glands only

(3)Respiratory pigment structure in different animals

(4)Evolution of vertebrate skeleton

Answer Key

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143

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174

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802

811

822

831