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.
Correct Answer: A
Solution :
[a] 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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