Fibrous bands present in endothecium of anther wall is made up of

Options

A. sporopollenin
B. a-cellulose
C. pectin
D. lignin

Answer

To answer the question regarding the fibrous bands present in the endothecium of the anther wall, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Anther**:
- The anther is composed of two lobes and is divided into two thecae. It has several layers, including the epidermis, endothecium, middle layer, and tapetum.

2. **Identify the Relevant Layer**:
- The question specifically asks about the endothecium, which is one of the layers of the anther wall.

3. **Examine the Composition of the Endothecium**:
- The endothecium is known to have fibrous bands that provide structural support.

4. **Review the Options Provided**:
- The options given are sporopolynin, alpha cellulose, pectin, and lignin.

5. **Analyze Each Option**:
- **Sporopolynin**: This is a resistant organic matter found in the outer covering of pollen grains, not in the endothecium.
- **Alpha Cellulose**: This is a component of the cell wall and is known to be present in the fibrous bands of the endothecium.
- **Pectin**: This is a polysaccharide that helps in cell adhesion and is not specifically associated with the fibrous bands.
- **Lignin**: This provides rigidity and strength to cell walls but is not the primary component of the fibrous bands in the endothecium.

6. **Conclude the Correct Answer**:
- After analyzing the options, the fibrous bands present in the endothecium of the anther wall are made up of **alpha cellulose**.

### Final Answer:
The fibrous bands present in the endothecium of the anther wall are made up of **alpha cellulose**.

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