BIOLOGY FOR CLASS X - CHAPTER 3: COORDINATION AND CONTROL
A. MULTIPLE CHOICE QUESTIONS & FILL IN THE BLANKS
Multiple Choice Questions: (i) b, (ii) a, (iii) a, (iv) c, (v) b, (vi) d, (vii) b, (viii) a, (ix) b, (x) a, (xi) b, (xii) a, (xiii) b, (xiv) b, (xv) b, (xvi) c.
Fill In The Blanks: 1. RECEPTORS, 2. effectors, 3. Chemical/Nervous, 4. neurons/electrochemical, 5. chemical coordination, 6. centralized-type, 7. Brain, 8. Cerebrum/cerebellum/thalamus/hypothalamus/medulla oblongata, 9. Spinal cord, 10. Peripheral Nervous System, 11. neurons, 12. neuronal signal or nerve impulse, 13. reflex arc, 14. receptors, 15. Accommodation.
B. SHORT QUESTIONS ANSWERS
i) Feedback System: Check and balance system (Stimulus, Receptors, Response, Effectors).
ii & iii) Coordination: Nervous is faster due to electrochemical signals.
iv) Reflex Arc: Pathway: Receptor → Sensory Neuron → CNS → Motor Neuron → Effector.
v) Color Blindness: Defect in retinal cones; prevents red/green distinction.
vi) Goiter: Iodine deficiency causes thyroid enlargement.
vii) Islets of Langerhans: Alpha cells (Glucagon) increase glucose; Beta cells (Insulin) decrease it.
viii) Emergency Hormone: Adrenaline/Epinephrine; "fight or flight" response.
ix) Paralysis Causes: Hemorrhage in brain or nerve injury.
x) Epilepsy: Brain disorder with abnormal electrical activity causing seizures.
xi) Difference Table:
| S.NO | NERVOUS | CHEMICAL |
|---|---|---|
| 1 | Neurons | Secretory cells |
| 2 | Electro-chemical | Chemical |
| 3 | Rapid | Slower |
| 4 | Short | Long |
xii-xvi: Definitions of coordination, plant movements (touch-me-not/sunflower auxins), and light/sound physics.
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