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The swelling in feet and ankles of an aged person due to sitting continuously for long hours during travel, is reduced by soaking the feet in warm salt water. This is because of

A reverse osmosis
B osmosis
C edema
D diffusion

Verified Solution

Answer & Solution

Correct Answer

(B) osmosis

Step-by-step Solution

Detailed explanation

Soaking feet in warm water promotes the
osmosis of molectules, including fluids, by increasing their kinetic energy. It also facilitates the movement of molecules from an area of higher concentration (swollen tissues) to an area of lower concentration (the bloodstream). This helps in reducing swelling by removing exeess fluid and promoting proper circulation.

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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