Question

One of the characteristics of sieve tube is that it

• A. is enucleated living cell
• B. transports water
• C. is dead cell
• D. has annular thickenings on side walls

Answer 1

The correct option is A is enucleated living cell

An enucleated plant cell is sieve tube cells. The nucleus of the sieve tube cell gets fragmented and disappears at maturity. The sieve tube is an elongated living cell of the phloem which helps in conducting or transporting food in plants (from leaves to fruits and roots).
Annular thickenings are commonly found in the vessels and tracheids. They are components of xylem.