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In T.S. Pheretima, the correct sequence ...

In T.S. Pheretima, the correct sequence of body wall layers from outer to inner side (a) Circular muscles (b) Parietal peritoneum ( c) Epidermis (d) Cuticle (e) Longitudinal muscles

A

`c to b to e to a to d`

B

`d to c to e to a to b`

C

`d to c to a to e to b `

D

`d to b to a to e to c`

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct sequence of body wall layers in the transverse section of Pheretima (earthworm), we need to identify the layers from the outermost to the innermost. Here’s a step-by-step breakdown of the layers: 1. **Cuticle (D)**: The outermost layer of the body wall is the cuticle. It is a protective layer that covers the epidermis. 2. **Epidermis (C)**: Beneath the cuticle lies the epidermis, which is a layer of living cells that secretes the cuticle and is involved in various physiological functions. 3. **Circular Muscles (A)**: Following the epidermis, we find the circular muscles. These muscles are responsible for the contraction and expansion of the body, aiding in locomotion. 4. **Longitudinal Muscles (E)**: Inside the circular muscles are the longitudinal muscles. These muscles run along the length of the body and work in opposition to the circular muscles for movement. 5. **Parietal Peritoneum (B)**: The innermost layer is the parietal peritoneum, which is a thin membrane that lines the coelom (body cavity) and supports the internal organs. Thus, the correct sequence of body wall layers from outer to inner side is: **Cuticle (D) → Epidermis (C) → Circular Muscles (A) → Longitudinal Muscles (E) → Parietal Peritoneum (B)**. The final answer is: **D, C, A, E, B**.
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