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Question

Which one of the following is dead but work efficiently?


A

xylem plates

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B

Vessels

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C

Companion cells

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D

Sieve tube

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Solution

The correct option is D

Sieve tube


Sieve tubes are dead cells with thin cellulosic walls. They are enucleated at maturity. These are conducting elements of phloem. Companion cells are thin-walled, living cells which remain associated with sieve tubes. They help in transport of food along the sieve tubes.


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