Choose the appropriate reason for the bidirectional translocation of organic solutes through the phloem.

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the photosynthates are always transported from leaves to roots.

Sugars are always transported from roots to growing regions.

the photosynthates are always transported from leaves to shoot apex

the sucrose loaded into the phloem from green cells of leaf is transported in both upward direction as well as downward direction due to development of turgor pressure.

answer is C.

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Detailed Solution

The turgor pressure developed in the phloem at the source makes the pushing of solutes to a region of low turgor pressure in both upward and downward direction. Hence phloem transport bidirectional. During favourable conditions, it is from leaves to other upward and downward parts of the plant and in early spring, it is from roots to other aerial parts as well as root apical meristem.

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