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Solution


Q.

Which of the following statements are true

(i) Sudden action in response to something in the environment is called reflex action.
(ii) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.
(iii) Motor neurons carry signals from spinal cord to effector organs.
(iv) Sensory neurons carry impulses from effectors to receptors.
1 (i) and (ii)  
2 (iii) and (iv)  
3 (i) and (iv)  
4 (i), (ii) and (iii)  

Ans.

(3)

Statements (ii) and (iii) are wrong in their sense because sensory neurons carry signals from receptors to spinal cord and motor neurons carry signals from spinal cord to the muscles. Thus, statement (i) and (iv) are true