All the following statements regarding sieve | vedclass

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(A) Sieve tube elements are the main conducting cells of the phloem. They are long,slender,tube-like structures arranged in longitudinal series. They

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

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(A) Sieve tube elements are the main conducting cells of the phloem. They are long,slender,tube-like structures arranged in longitudinal series. They possess peripheral cytoplasm and a large central vacuole,but they lack a nucleus at maturity. They contain $P$-proteins (phloem proteins) in their lumen. The end walls are perforated to form sieve plates,which are lined with callose,not lignin. Therefore,the statement that they become impregnated with lignin is incorrect,as lignin is a characteristic of xylem elements (tracheids and vessels).

All the following statements regarding sieve tube elements are true except

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