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Q.

The main function of companion cell is:

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a

protection of sieve tubes

b

maintaining the pressure gradient in sieve tubes

c

providing mechanical support to the plant

d

transporting water and minerals

answer is B.

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Detailed Solution

The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls. The companion cells help in maintaining the pressure gradient in the sieve tubes.
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The main function of companion cell is: