Question

The nucleus is absent in the mature

• A. Sieve tube cells
• B. Monocytes
• C. Mammalian Erythrocytes
• D. Both a & c

Answer 1

The correct option is D Both a & c

The nucleus is absent in the mature sieve tube cells and mammalian Erythrocytes.
The absence of a nucleus is an adaptation of the red blood cell for its role. It allows the red blood cell to contain more hemoglobin and, therefore, carry more oxygen molecules.Sieve tube members have no cell nucleus, ribosomes, or .vacuoles. Thus, they depend on companion cells to provide proteins, ATP, and signalling molecules.