Question

Which one of the following is a dead cell?

• A. Phloem fibres
• B. Sieve tube
• C. Companion cell
• D. Aerenchyma

Answer 1

The correct option is A

Phloem fibres

Phloem is made up of 4 types of cells:
Sieve tube elements, companion cells, phloem parenchyma and phloem fibres. Phloem fibres also called as bast fibres are the only dead cells present in the phloem. Sieve tubes, phloem parenchyma and companion cells are all living cells. Aerenchyma is a type of parenchyma.