Question

Assertion: Translocation of sucrose through phloem is a passive process.

Reason: Sucrose is pumped from leaves to sieve tubes at the expense of ATP.

• A. Both assertion and reason are incorrect.
• B. Assertion is incorrect and reason is correct.
• C. Assertion is correct and reason is incorrect.
• D. Both assertion and reason are correct.

Answer 1

The correct option is B Assertion is incorrect and reason is correct.

During organic translocation, sugars and other metabolites are pumped from the mesophyll cells of leaves to sieve tube of phloem tissue through companion cells using energy (ATP). Since energy is involved, translocation through phloem is an active process, unlike diffusion which is passive and does not require the expense of energy.