Which of the following is not required for the translocation of sugars through phloem?
a) sugars are loaded at a "source" such as leaves.
b) sugars are unloaded at a "sink" such as the root.
c) atp.
d) evaporative pressure.

The correct answer will be option D.

Explanation:

The transport of photosynthates takes place through the tissue phloem.

The site at which the sugar is produced is known as the source while the site at which it is required is known as the sink.  The sugars are translocated through the pressure-flow model which states that sugar is transported in phloem sieve tube elements with the help of turgor pressure and no evaporative pressure is involved in the translocation of sucrose from source to sink.

Thus, option D is the correct answer.

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