Question

All of the following statements are regarding sieve tube elements that are true except

• A. Their end walls have perforated sieve plates which become impregnated with lignin at maturity.
• B. They possess a 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.
• E. They are devoid of nucleus at maturity.

Answer 1

The correct option is A Their end walls have perforated sieve plates which become impregnated with lignin at maturity.

Sieve tube members are tubular, placed in long series and have specialized sieve areas called as sieve plates occurring at end walls. These sieve plates are often inclined. In sieve plate large pores are observed.
Therefore, the correct answer is option A.