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Question

Enucleate thin-walled cells with perforated septa are

A
Prosenchyma
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B
Sieve cells
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C
Sieve tube elements
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D
Companion cells.
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Solution

The correct option is C Sieve tube elements
Sieve-tube elements are almost always adjacent to nucleus-containing companion cells, which have been produced as sister cells with the sieve element from the same mother cell. Companion cells apparently function with the enucleate sieve-tube elements and die when they break down. The sieve cells of non-angiospermous vascular plants lack true companion cells, although other adjacent cells may serve a similar function.
So, the correct answer is 'Sieve tube elements.'

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