Question

The translocation of organic solutes in sieve tubes is supported by

• A. Cytoplasmic steaming
• B. Root pressure and transpiration pull
• C. P-proteins
• D. Mass flow involving a carrier and ATP

Answer 1

The correct option is D Mass flow involving a carrier and ATP

Munch's Mass Flow Hypothesis is the theory which explains the flow of food materials through the phloem from the higher concentration regions to lower concentration regions. The force is needed to move organic food materials downwards in the phloem. The energy for the translocation of the food is provided by the ATP which acts as a ligand to the sucrose and hydrogen ion symporter and allows the movement of the food through the sieve tubes.

Thus, the correct answer is option D.