Question

Which of the following plant cell undergoes programme cell death to become functional?

• A. Phloem sieve tube member
• B. Xylem vessel member
• C. Stomatal gaurd cell
• D. Bundle sheath cell

Answer 1

The correct option is A Phloem sieve tube member

In mature phloem sieve tube member undergoes programmed cell death. It is highly selective degradation in which organelles like vacuole, cytoskeleton, ribosomes, golgi bodies, and nucleus. The modification of ER occurs which lacks ribosomes called sieve endoplasmic reticulum. The mitochondria, plasma and its proteins and plastids arrange at the edge of sieve tubes. This is important as it creates space that allows water, mRNA, signal proteins and photoassimilates to transport through it. During maturation cell wall that connects SE get perforated and connects one SE with another SE.

So the correct option is 'phloem sieve tube member'.