In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Translocation of sugar from source (leaf) to sink is defined as pressure flow hypothesis
Reason: Translocation of the solute is facilitated through living phloem sieve tube cells.
If both assertion and reason are true but reason is not the correct explanation of assertion.
The accepted mechanism for the translocation of sugars from source to sink is called pressure flow hypothesis. The glucose is prepared at the source by photosynthesis, it is converted to sucrose (a disaccharide). The sugar is then moved in the form of sucrose into the companion cells and then into living phloem, sieve tube cells by active transport.