MHT CET · BIOLOGY · STD 12 - 8. Respiration and Circulation

Select the correct match

A Expiration - The rib cage moves inward and upward.
B Inspiration - The diaphragm relaxes.
C Normal breathing - Involuntary process.
D Tidal volume - Includes two respiration cycles.

Verified Solution

Answer & Solution

Correct Answer

(C) Normal breathing - Involuntary process.

Step-by-step Solution

Detailed explanation

i. Expiration: The ribcage moves inward and downward.
ii. Inspiration: The diaphragm contracts.
iii. Tidal volume: It is the volume of air inspired or expired during normal breathing.

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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