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Q.

Which of the following is not correct about the mass flow in phloem?

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a

Sugar is uploaded into phloem sieve tubes by passive transport

b

Loading of sugar at the source produces a hypertonic condition in the phloem

c

Photosynthate trans-located into phloem as sucrose

d

As sugars are removed from phloem, the osmotic pressure decreases and water moves out

answer is A.

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Detailed Solution

The sugar is moved in the form of sucrose into the companion cells and then into the living phloem sieve tube cells by active transport of the phloem.

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Which of the following is not correct about the mass flow in phloem?