Coordination and Control is an important chapter of Class 10 Biology that explains how organisms respond to internal and external stimuli. This chapter covers nervous coordination, hormonal control, structure of neurons, reflex actions, endocrine glands, and the role of plant hormones. This post includes Class 10 Biology Chapter 3 MCQs prepared according to the Punjab and Sindh Board syllabus for effective exam preparation.
1. Coordination is the ability of an organism to:
- A. Produce energy
- B. Respond to stimuli effectively ✅
- C. Grow in size
- D. Reproduce
Explanation: Coordination allows organisms to respond properly to changes in environment.
2. Which system provides rapid coordination in humans?
- A. Endocrine system
- B. Nervous system ✅
- C. Digestive system
- D. Circulatory system
Explanation: Nervous system transmits impulses very quickly.
3. The basic unit of the nervous system is:
- A. Brain
- B. Nerve
- C. Neuron ✅
- D. Spinal cord
Explanation: Neuron is the structural and functional unit of nervous system.
4. Which part of neuron receives nerve impulses?
- A. Axon
- B. Dendrites ✅
- C. Myelin sheath
- D. Node of Ranvier
Explanation: Dendrites receive impulses from receptors or other neurons.
5. Reflex actions are controlled by:
- A. Brain
- B. Spinal cord ✅
- C. Cerebellum
- D. Medulla
Explanation: Reflex actions are rapid and controlled by spinal cord.
6. Which part of brain controls thinking and memory?
- A. Cerebellum
- B. Cerebrum ✅
- C. Medulla oblongata
- D. Pons
Explanation: Cerebrum controls intelligence, memory, and reasoning.
7. Which part of brain controls balance and posture?
- A. Cerebrum
- B. Cerebellum ✅
- C. Medulla
- D. Hypothalamus
Explanation: Cerebellum maintains balance and coordination of muscles.
8. The chemical substances secreted by endocrine glands are called:
- A. Enzymes
- B. Hormones ✅
- C. Vitamins
- D. Neurotransmitters
Explanation: Hormones regulate body functions chemically.
9. Which gland is known as the master gland?
- A. Thyroid
- B. Pituitary ✅
- C. Adrenal
- D. Pancreas
Explanation: Pituitary gland controls other endocrine glands.
10. Which hormone controls blood sugar level?
- A. Thyroxine
- B. Insulin ✅
- C. Adrenaline
- D. Estrogen
Explanation: Insulin lowers blood glucose level.
11. Adrenaline is secreted by:
- A. Pituitary gland
- B. Thyroid gland
- C. Adrenal gland ✅
- D. Pancreas
Explanation: Adrenal glands secrete adrenaline during stress.
12. Which hormone regulates metabolism?
- A. Insulin
- B. Thyroxine ✅
- C. Adrenaline
- D. Testosterone
Explanation: Thyroxine controls metabolic rate.
13. Which plant hormone promotes cell elongation?
- A. Cytokinin
- B. Auxin ✅
- C. Ethylene
- D. Abscisic acid
Explanation: Auxins promote growth by cell elongation.
14. Which plant hormone causes fruit ripening?
- A. Auxin
- B. Gibberellin
- C. Ethylene ✅
- D. Cytokinin
Explanation: Ethylene is responsible for fruit ripening.
15. The pathway followed by nerve impulse in reflex action is called:
- A. Neuron path
- B. Reflex arc ✅
- C. Synapse
- D. Effector path
Explanation: Reflex arc is the path of impulse in reflex action.
16. Which structure connects neurons?
- A. Dendrite
- B. Synapse ✅
- C. Axon
- D. Nerve fiber
Explanation: Synapse allows transmission of impulses between neurons.
17. Which hormone is responsible for fight-or-flight response?
- A. Insulin
- B. Adrenaline ✅
- C. Thyroxine
- D. Growth hormone
Explanation: Adrenaline prepares the body for emergencies.
18. Which part of nervous system controls voluntary actions?
- A. Autonomic nervous system
- B. Somatic nervous system ✅
- C. Sympathetic system
- D. Parasympathetic system
Explanation: Somatic nervous system controls voluntary muscles.