MHT CET · BIOLOGY · STD 12 - 6. Plant Water Relation

In plants, polymerisation of excess sugar into starch takes place in the ___________ at the sink end.

A root cells
B chloroplast
C sieve tube
D xylem

Verified Solution

Answer & Solution

Correct Answer

(A) root cells

Step-by-step Solution

Detailed explanation

According to the Munch Hypothesis, sugar is used, and excess is converted to starch at the sink end of root cells, reducing osmotic concentration. This leads to exo-osmosis and loss of water, decreasing cell turgidity and facilitating passive translocation of food by concentration gradient, known as vein unloading.

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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