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All the following statements regarding sieve tube elements are correct except that

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their end walls have perforated sieve plates which become impregnated with lignin at maturity.

they possess peripheral cytoplasm as well as a large vacuole.

distinct proteinaceous inclusions, the P-proteins are seen evenly distributed throughout the lumen.

long, slender, tube-like structures arranged in longitudinal series.

answer is A.

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Detailed Solution

The end walls of sieve tube elements are perforated in a sieve like manner to form the sieve plates. A mature sieve element possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus.

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