Question

Living tubular cells with perforated end walls are ______.

Options

• sieve cells

• sieve tubes

• tracheids

• vessels

Answer 1

Living tubular cells with perforated end walls are sieve tubes.

Explanation:

Sieve tubes are living phloem cells arranged end to end, with perforated end walls called sieve plates. Tracheids and vessels are dead xylem elements; mature sieve-tube elements lack a nucleus but remain living.