Question

Casparian strips occur in

• A. Pericycle
• B. Endodermis
• C. Epidermis
• D. Cortex

Answer 1

The correct option is B

Endodermis

The correct option is B.

Explanation of the correct option:

1. Casparian strips are ring-like cell wall modifications found in the root of the endodermis of vascular plants.
2. Casparian strips are hydrophobic, ring-like cell wall thickenings.
3. They form a barrier to chemicals like herbicides, blocking their entry into the cell.
4. They are found in the endodermis.
5. They are found in vascular plants, the plants which have a specialized conducting system of xylem and phloem.

Explanation of the incorrect option:

Option A:

1. The pericycle is a primary tissue of cylindrical parenchyma or sclerenchyma cells.
2. They are found on the inner side of the endodermis, outside the stele of plants.
3. The functions of the pericycle involve the initiation of lateral roots and the initiation of vascular and cork cambium.

Option C:

1. The epidermis is the outermost layer of cells of plants.
2. They are derived from protoderm. it covers, the roots, leaves, stem, fruit, flower, and seed of the plant.
3. It defines the boundary between the plant and the external environment.

Option D:

1. Cortex lies beneath the epidermis of the stem or root in a plant and above the vascular tissues.
2. These cells store carbohydrates or other substances such as resins, latex, essential oils, and vitamins.

Final answer: Casparian strips occur in the endodermis.