Question

Which of the following tissues consists of living cells?

• A. Vessels
• B. Tracheids
• C. Companion cells
• D. Sclerenchyma

Answer 1

The correct option is C

Companion cells

The correct option is C:

Explanation of the correct option:

1. Companion cells are living cells that are found in the phloem of flowering plants (angiosperms).
2. They are nucleated with several ribosomes, plastids, and mitochondria.
3. They are responsible for controlling the activity of sieve cells by shifting the sugar and amino acids in and out of the sieve elements.

Explanation of the incorrect option:

Option A:

1. Vessels are long cylindrical tube-like structure that is made up of many cells.
2. It is composed of dead cells.

Option B:

1. Tracheids are composed of dead cells.
2. They have thick and lignified walls.

Option D:

1. Sclerenchyma is also composed of dead cells.
2. These cells are long and have thick walls.

Final answer: Companion cells consist of living cells.