Control and Coordination – 50 Hard MCQs
Nervous System
1. The structural and functional unit of nervous system is:
(a) Axon
(b) Nephron
(c) Neuron
(d) Dendrite
2. The gap between two neurons is called:
(a) Axon
(b) Dendrite
(c) Synapse
(d) Node
3. Transmission of impulse across synapse occurs through:
(a) Electrical signals only
(b) Neurotransmitters
(c) Direct contact of neurons
(d) Movement of ions only
4. The part of brain responsible for voluntary actions is:
(a) Cerebellum
(b) Cerebrum
(c) Medulla oblongata
(d) Hypothalamus
5. Which part of brain controls balance and posture?
(a) Cerebrum
(b) Cerebellum
(c) Pons
(d) Medulla
6. Reflex actions are controlled by:
(a) Brain
(b) Spinal cord
(c) Cerebrum
(d) Medulla
7. Which of the following is a reflex action?
(a) Reading a book
(b) Salivation at sight of food
(c) Walking
(d) Solving math
8. The protective covering around axon is:
(a) Myelin sheath
(b) Synapse
(c) Dendrite
(d) Cerebrospinal fluid
9. The junction of two neurons is rich in:
(a) Insulin
(b) Neurotransmitters
(c) Enzymes
(d) Hormones
10. Which nerve carries impulses from eye to brain?
(a) Auditory nerve
(b) Olfactory nerve
(c) Optic nerve
(d) Sensory nerve
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Plant Hormones and Movements
11. Which hormone promotes cell elongation in plants?
(a) Gibberellin
(b) Auxin
(c) Cytokinin
(d) Abscisic acid
12. Which plant hormone promotes fruit ripening?
(a) Auxin
(b) Ethylene
(c) Gibberellin
(d) Cytokinin
13. Which plant hormone promotes seed germination?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) ABA
14. Which hormone inhibits growth in plants?
(a) Auxin
(b) Cytokinin
(c) Gibberellin
(d) Abscisic acid
15. Phototropism is caused due to:
(a) Uniform distribution of auxin
(b) Uneven distribution of auxin
(c) Cytokinin accumulation
(d) ABA
16. Roots grow downwards due to:
(a) Hydrotropism
(b) Geotropism
(c) Chemotropism
(d) Thigmotropism
17. Tendrils coil around support due to:
(a) Hydrotropism
(b) Thigmotropism
(c) Phototropism
(d) Chemotropism
18. Growth of pollen tube towards ovule is an example of:
(a) Phototropism
(b) Geotropism
(c) Chemotropism
(d) Thigmotropism
19. Opening and closing of stomata is controlled by:
(a) Auxin
(b) ABA
(c) Ethylene
(d) Gibberellin
20. Sleep movement of leaves in Mimosa pudica is due to:
(a) Tropic movement
(b) Nastic movement
(c) Hydrotropism
(d) Thigmotropism
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Endocrine System
21. The master gland in humans is:
(a) Thyroid
(b) Pituitary
(c) Adrenal
(d) Pancreas
22. Which hormone regulates metabolism?
(a) Insulin
(b) Thyroxine
(c) Adrenaline
(d) Auxin
23. Which hormone controls sugar level in blood?
(a) Thyroxine
(b) Adrenaline
(c) Insulin
(d) Pituitary hormone
24. Which hormone is called emergency hormone?
(a) Insulin
(b) Thyroxine
(c) Adrenaline
(d) Auxin
25. Which gland is situated above kidneys?
(a) Pituitary
(b) Adrenal
(c) Thyroid
(d) Pancreas
26. Goitre is caused by deficiency of:
(a) Calcium
(b) Iron
(c) Iodine
(d) Potassium
27. Diabetes is caused by deficiency of:
(a) Thyroxine
(b) Adrenaline
(c) Insulin
(d) Growth hormone
28. Which endocrine gland is both exocrine and endocrine?
(a) Liver
(b) Pancreas
(c) Thyroid
(d) Kidney
29. Which hormone controls growth in children?
(a) Thyroxine
(b) Growth hormone
(c) Insulin
(d) Adrenaline
30. Which gland is called “emotional gland”?
(a) Adrenal
(b) Thyroid
(c) Pituitary
(d) Pancreas
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Integrated Control
31. Reflex arc differs from normal nerve pathway because it:
(a) Involves brain directly
(b) Involves spinal cord only
(c) Involves pituitary
(d) Involves medulla
32. Which is NOT a voluntary action?
(a) Writing
(b) Blinking
(c) Walking
(d) Speaking
33. Which part of brain regulates hunger and thirst?
(a) Cerebrum
(b) Medulla
(c) Hypothalamus
(d) Cerebellum
34. Coordination in plants is achieved by:
(a) Hormones only
(b) Nervous system
(c) Both nervous and hormones
(d) None
35. Tropic movements are always:
(a) Random
(b) Directional
(c) Nastic
(d) Neutral
36. Which plant hormone delays ageing of leaves?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) ABA
37. Which part of brain controls involuntary actions like heartbeat?
(a) Cerebrum
(b) Medulla
(c) Cerebellum
(d) Hypothalamus
38. Which part of brain is largest in humans?
(a) Cerebrum
(b) Cerebellum
(c) Medulla
(d) Pons
39. Which part of human brain controls body temperature?
(a) Pituitary
(b) Cerebrum
(c) Hypothalamus
(d) Cerebellum
40. Nervous control in humans is faster than hormonal because:
(a) Hormones are unstable
(b) Impulses travel as electrical signals
(c) Hormones diffuse slowly in blood
(d) Both (b) and (c)
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Miscellaneous
41. The message from receptor to CNS is carried by:
(a) Motor neuron
(b) Sensory neuron
(c) Relay neuron
(d) None
42. The message from CNS to effector is carried by:
(a) Sensory neuron
(b) Motor neuron
(c) Relay neuron
(d) Synapse
43. Involuntary actions are controlled by:
(a) Cerebrum
(b) Medulla
(c) Cerebellum
(d) Spinal cord
44. The peripheral nervous system consists of:
(a) Brain + Spinal cord
(b) Brain + Nerves
(c) Spinal cord + Nerves
(d) Nerves outside CNS
45. Which hormone is secreted in stress situations?
(a) Thyroxine
(b) Adrenaline
(c) Insulin
(d) Auxin
46. Movement of sunflower towards sunlight is:
(a) Phototropism
(b) Nastic
(c) Chemotropism
(d) Geotropism
47. Which plant hormone is used for artificial ripening of fruits?
(a) Ethylene
(b) Auxin
(c) Cytokinin
(d) ABA
48. Reflex arc in humans usually bypasses:
(a) Spinal cord
(b) Brain
(c) Effector
(d) Sensory neuron
49. Which endocrine gland controls sexual characters?
(a) Adrenal
(b) Gonads
(c) Thyroid
(d) Pituitary
50. Which hormone regulates water balance in body?
(a) ADH (Vasopressin)
(b) Insulin
(c) Adrenaline
(d) Auxin
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✅ Answer Key
1-c, 2-c, 3-b, 4-b, 5-b
6-b, 7-b, 8-a, 9-b, 10-c
11-b, 12-b, 13-b, 14-d, 15-b
16-b, 17-b, 18-c, 19-b, 20-b
21-b, 22-b, 23-c, 24-c, 25-b
26-c, 27-c, 28-b, 29-b, 30-a
31-b, 32-b, 33-c, 34-a, 35-b
36-c, 37-b, 38-a, 39-c, 40-d
41-b, 42-b, 43-b, 44-d, 45-b
46-a, 47-a, 48-b, 49-b, 50-a
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