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

What is NOT true about cohesion-tension theory of translocation of water in plants?

A Thee is a force of attraction between water and lignified walls of xylem cells.
B Living cells of roots play an active role and ascent of sap occurs actively.
C Transpiration pull is transmitted downward from leaf, stem to root.
D Water molecules have strong mutual attraction so they cannot be easily separated.

Verified Solution

Answer & Solution

Correct Answer

(B) Living cells of roots play an active role and ascent of sap occurs actively.

Step-by-step Solution

Detailed explanation

Ascent is upward movement of water and minerals in xylem which are non living cells with lignin deposition.

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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