Question

Which is wrong about sieve tube elements?

• A. Peripheral cytoplasm and large vacuole
• B. Perforated end wall becomes impregnated with lignin
• C. P-proteins occurs evenly distributed-throughout lumen
• D. Absence of nucleus at maturity
• E. Tube-like structures present in longitudinal series

Answer 1

The correct option is B Perforated end wall becomes impregnated with lignin

In flowering plants, elongated living cells (sieve-tube elements) of the phloem, the nuclei of which have fragmented and disappeared and the transverse end walls of which are pierced by sieve like groups of pores (sieve plates). They are conduits of food (mostly sugar) transport.

So, the correct answer is 'Perforated end wall becomes impregnated with lignin.'