Dead protoplast is observed in all except

Xylem vessels

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Scelerenchyma fibres

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Phloem fibres

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Sieve element

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Solution

The correct option is D Sieve element
Sieve elements which constitute to form phloem are long tube-like structures, arranged longitudinally and are associated with the companion cells. It possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus.
So the correct option is 'Sieve element'.

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