All the following statements regarding sieve tube elements are corr...

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All the following statements regarding sieve tube elements are correct except that:
(a) their end walls have perforated sieve plates which become impregnated with lignin at maturity.
(b) they possess peripheral cytoplasm as well as a large vacuole.
(c) distinct proteinaceous inclusions, the P-proteins are seen evenly distributed throughout the lumen.
(d) long, slender, tube-like structures arranged in longitudinal series.
\( \mathrm{P} \)
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