Question

Sieve tube differs from vessels in

• A. Absence of nucleus
• B. Less deposition of lignin
• C. Being dead
• D. Lack of cytoplasm

Answer 1

Answer: (B)

Less deposition of lignin

A mature sieve tube is different from a vessel in absence of lignin in walls. The main function of the sieve tube is the transport of carbohydrates, primarily sucrose, in the plant. Unlike the water-conducting xylem vessel elements that are dead whereas the mature, sieve elements are living cells. They are devoid of the nucleus at maturity.

So, the correct answer is option B.