Question

A common structural feature of vessel elements and sieve tube elements is

• A. Thick secondary walls
• B. Pores on lateral wall
• C. Presence of p-protein
• D. Enucleate condition

Answer 1

The correct option is B Pores on lateral wall

Vessels are one of the four elements that constitute xylem, whereas sieve tube element is an element of phloem.
The walls of both vessels and sieve tube elements are perforated by large openings or pores on lateral walls. These pores facilitate the transport of materials.
Unlike the water-conducting xylem vessel elements that are dead , sieve elements are living cells. They lose their nucleus on maturity.
The walls of xylem vessels undergo secondary thickening at maturity, unlike those of the sieve-tube elements.
P-proteins are structural proteins present in phloem but not in xylem.