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Q.

The sieve tube elements and Companion cells are connected with each other through

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a

Plasmodesmata present at pit fields of common longitudinal walls

b

Plasmodesmata present at pit fields of common transverse walls

c

Plasmodesmata present at pit fields of common transverse and longitudinal walls    

d

Pit membrane present at Simple pits.

answer is A.

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Detailed Solution

Longitudinal walls of sieve tube elements and companion cells are associated with each other at which there are pit fields in the primary wall. These pit fields are traversed by branched or unbranched plasmodesmata through which the signals are sent from companion cells to sieve tube elements to regulate the activities of sieve tube elements.

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