Question

A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is

• A. Absence of mitochondria
• B. Presence of cell wall
• C. Presence of haemoglobin
• D. Absence of nucleus

Answer 1

Answer: (D)

Absence of nucleus

The mammalian RBC's lose their nuclei at maturity and survive for a few months only. The food conducting phloem cells called sieve tubes, of flowering plants also lose their nuclei at maturity but they remain functional for several years.

So, the correct answer is 'Absence of nucleus'.