Multiple choice

Which of the following cells consist of an organised and differentiated cellular structure having cytoplasm without any nucleus at maturity?

  1. Phloem parenchyma

  2. Xylem parenchyma

  3. Tracheids

  4. Sieve tubes

  5. Companion cells

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sieve tube is an organised and differentiated cellular structure having cytoplasm without any nucleus. However, nucleus is present in young cells, but mature sieve tube element lacks nucleus. Its functions are controlled by the nucleus of companion cells.