casparian strip is fomred by depposition of

Options

A. mainly pectin
B. cellulose
C. suberin & lignin
D. lignin

Answer

**Step-by-Step Solution:**

1. **Understanding the Casparian Strip**: The Casparian strip is a band of cell wall material that is impregnated with suberin, a waxy substance. It is found in the endodermis of plant roots.

2. **Identifying Components**: The question asks what material is deposited to form the Casparian strip. The options provided are pectin, cellulose, suberin, and lignin.

3. **Analyzing the Options**:
- **Pectin**: This is a polysaccharide found in the cell walls of plants but is not a major component of the Casparian strip.
- **Cellulose**: This is a structural component of plant cell walls but does not form the Casparian strip.
- **Suberin**: This is the primary component of the Casparian strip and is responsible for its impermeability to water and solutes.
- **Lignin**: This is a complex organic polymer that adds rigidity to plant cell walls but is not the main component of the Casparian strip.

4. **Conclusion**: The Casparian strip is primarily formed by the deposition of suberin, with some lignin present as well. However, suberin is the major component.

5. **Final Answer**: The Casparian strip is formed by the deposition of **suberin**.

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