MHT CET · BIOLOGY · STD 12 - 9. Control and Coordination

Which of the following statements are correct?
(i) Ramus dorsalis branch of spinal nerve contains sensory as well as motor nerve fibres
(ii) The preganglionic nerve fibres arise from entire spinal cord.
(iii) There are 31 pairs of spinal nerves.
(iv) The somatic nervous system transmits impulses form CNS to visceral organs.
(v) Reflex action is sudden, thoughtful and voluntary response to the applied stimulus
Select the correct option.

A (i) and (ii) only
B (ii) and (iv) only
C (i) and (iii) only
D (iii) and (v) only

Verified Solution

Answer & Solution

Correct Answer

(C) (i) and (iii) only

Step-by-step Solution

Detailed explanation

ii. Preganglionic nerve fibers arise from specific segments of the spinal cord.
iv. The somatic nervous system transmits impulses from the central nervous system (CNS) to skeletal muscles
v. Reflex actions are involuntary and automatic responses to a stimulus.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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