Question

Where do the casparian bands occur?

• A. epidermis
• B. endodermis
• C. pericycle
• D. phloem.

Answer 1

The Correct Option is B

The question asks about the location of Casparian bands, which is a topic in plant anatomy. Understanding this requires knowledge of the structure of plant roots.

The Casparian bands, also known as Casparian strips, are a characteristic feature of the plant endodermis. Let's understand this in more detail:

• Epidermis: This is the outermost layer of cells in plant roots and leaves. Its primary function is protection and it does not contain Casparian bands.
• Endodermis: This is the innermost layer of the cortex in plant roots. Here, the Casparian band is found, which is a band-like thickening made of suberin. It regulates the flow of water and nutrients into the xylem by blocking the passive flow between cells.
• Pericycle: This is a layer of cells just inside the endodermis, involved in the formation of lateral roots but does not possess Casparian bands.
• Phloem: This tissue is responsible for transporting sugars and other metabolic products downward from the leaves. It is not related to Casparian bands.

Conclusion: The correct location for Casparian bands is the endodermis of the plant root. This band plays a crucial role in controlling the uptake of water and solutes into the plant's vascular system.