Question

Which of the following statements is INCORRECT?

• A. In the dicot root, the vascular cambium is completely secondary in origin.
• B. Wood is the common name used for secondary xylem.
• C. A mature sieve tube element lacks peripheral cytoplasm, a large vacuole and a prominent nucleus.
• D. Lenticels are the aerating pores present in the bark of plants and are associated with gaseous exchange.

Answer 1

Answer: (C)

A mature sieve element possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus. The functions of sieve tubes are controlled by the nucleus of companion cells.