Question

Casparian strips are found on the:

• A. Walls of epidermal cells
• B. Walls of pericycle cells
• C. Walls of endodermal cells
• D. Walls of bundle sheath cells

Answer 1

The correct option is C

Walls of endodermal cells

The correct option is C.

Explanation of the correct option:

1. Casparian strips are the ring-like call wall modifications found in the root of the endodermis of vascular plants.
2. It acts as a barrier to harmful chemicals like herbicides.
3. So it is found in the walls of endodermal cells.
4. Endoderm forms the central and innermost layer of cortex in terrestrial plants.

Explanation of the incorrect options:

Option A:

1. The epidermis is the outermost layer of cells in plants forming the boundary between the plant and the external surface.
2. It covers the stem, root, leaf, flower, fruit, and seed.
3. It forms a barrier against mechanical injury, water loss, and infection.

Option B:

1. The pericycle is primary tissue formed of cylindrical parenchymatous cells.
2. It helps the plants to propagate and regulate the growth of the lateral cells.
3. It regulates the flow of water and dissolved substances from the surrounding cortex.

Option D:

1. Bundle sheath cells form a sheath around the vascular bundles.
2. These cells contain chloroplast and hence are a site of the Calvin cycle.
3. These are tightly packed cells seen around leaf veins made of parenchymatous cells.

Final answer: Casparian strips are found on the walls of endodermal cells.