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Q.

The mature sieve tube element lacks a nucleus. So it’s function is controlled by the nucleus of the

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a

phloem parenchyma 

b

adjacent xylem vessels

c

ray parenchyma 

d

companion cells

answer is B.

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Detailed Solution

A mature sieve element possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus. The functions of sieve tubes are controlled by the nucleus of companion cells.

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The mature sieve tube element lacks a nucleus. So it’s function is controlled by the nucleus of the