Question

Sieve tubes are associated with______________.

• A. Xylem tissue
• B. Cambium
• C. Phloem
• D. Cortex

Answer 1

Answer: (C)

Phloem

Sieve tubes are associated with phloem.

Sieve tube elements, also called sieve-tube members, are a specialized type of elongated cell in the phloem tissue of flowering plants. The ends of these cells are connected with other sieve-tube members, and together they constitute the sieve tube. The main function of the sieve tube is transport of carbohydrates, primarily sucrose, in the plant (e.g., from the leaves to the fruits and roots). Unlike the water-conducting xylem vessel elements that are dead when mature, sieve elements are living cells. They are unique in lacking a nucleus at maturity.