A rigid cell wall is usually seen in members of chlorophyoeae. This cell wall is constituted of

Options

A. Cellulose (outer layer) and algin (inner layer)
B. Chitin (outer layer) and pectose (inner layer)
C. Cellulose (inner layer) and pectose (outer layer)
D. Pectose (inner layer) and peptidoglycan (outer layer)

Answer

To answer the question regarding the composition of the rigid cell wall in members of Chlorophyceae, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Class**: Recognize that Chlorophyceae is a class of green algae. Members of this class are characterized by their green color due to the presence of chlorophyll.

2. **Understand Cell Wall Composition**: The cell wall of Chlorophyceae is known to have a specific structure. It is essential to know that the cell wall is not uniform across all types of algae and can vary in composition.

3. **Outer Layer Composition**: The outer layer of the cell wall in Chlorophyceae is primarily composed of pectin (also referred to as pectose). This layer is responsible for providing flexibility and some rigidity to the cell wall.

4. **Inner Layer Composition**: The inner layer of the cell wall is made up of cellulose. Cellulose provides strength and structural support to the cell wall.

5. **Conclusion**: Therefore, the correct composition of the cell wall in members of Chlorophyceae is that the outer layer is pectose and the inner layer is cellulose.

### Final Answer:
The rigid cell wall in members of Chlorophyceae is constituted of an outer layer of pectose and an inner layer of cellulose.

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