The translocation of organic solutes through phloem is bidirectional because

Root acts as source and leaf acts as sink

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Source and sink are irreversible in any season

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Translocation is ATP regulated process

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Source -sink relationship is variable depending upon season or needs plant

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Solution

The correct option is C Source -sink relationship is variable depending upon season or needs plant
The photosynthetic part acts as the source and the part in which the food is stored acts as the sink.
The contents of the phloem flow from the sources to the sinks.
But when the leaves shed the sugar stored in roots mobilize the organic material towards the growing buds.
Hence, the direction of the source and sink is reversed and the flow of food is bidirectional in the phloem.

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Similar questions

Q. Assertion :The direction of movement of organic solutes in the phloem is bidirectional. Reason: The transportation depends on variability of source-sink relationship.

Q. Statement 1: The translocation of food is always from source to sink.
Statement 2: Translocation in phloem is bidirectional.

Q. 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.

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.

Q. In phloem transport, the source-sink relationship is variable. Identify the statements in support of this.

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