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Q.

During phloem transport, at the source (leaf):

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a

the sugar and water of mesophyll cells are dumped actively into the sieve tubes of phloem

b

the sugar sucrose is passively dumped from mesophyll cells into sieve tubes via companion cells and water is actively moved from vessels of xylem into sieve tubes.

c

the sugar sucrose is passively dumped from mesophyll cells into sieve tubes via companion cells and water is osmosed from vessels of xylem

d

the sugar sucrose is actively dumped from mesophyll cells into sieve tubes via companion cells and water is osmosed from vessels of xylem

answer is B.

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Detailed Solution

During phloem transport, at the source (leaf), the sugar sucrose is actively dumped from mesophyll cells into sieve tubes via companion cells and water is osmosed from vessels of xylem.

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During phloem transport, at the source (leaf):