Question

Which of the following tissues has dead cells?

• A. Parenchyma
• B. Sclerenchyma
• C. Collenchyma
• D. Epithelial tissue

Answer 1

The correct option is B

Sclerenchyma

The correct option is option B.

Explanation of correct option:

1. One of the permanent tissues present in the plants is sclerenchyma cells.
2. They provide stiffness and hardness to the plant and comprise dead cells.
3. The cells of sclerenchyma are long and narrow and thickened because of the presence of lignin.
4. These cells are present in the stems around the vascular bundles, in the hard covering of the seeds and nuts, and in the veins of leaves.
5. The husk of the coconut is formed of sclerenchyma cells.

Explanation of incorrect options:

Option A:

1. The living tissues with a thin cell wall formed of cellulose comprising a central vacuole and dense cytoplasm are parenchyma.
2. These cells are located in the soft parts like the cortex and the pith.
3. These cells exchange gas, store food, and assist in the process of photosynthesis.

Option C:

1. The living tissues possessing a lengthened shape and thick cell wall formed of cellulose, hemicellulose, and pectin in the corner is collenchyma.
2. In collenchyma, the cell walls are not even in shape.
3. They are located in the stem, leaf veins, and below the epidermis.
4. These cells provide elasticity and mechanical support to the plant permitting easy bending without breakage.

Option D:

1. Epithelial tissues form the outer covering all over the body, it functions as protective tissue.
2. It develops a barrier to separating different systems of the body.

Final answer: Sclerenchyma tissues have dead cells.