In earthworm the buccal cavity extends upto

Options

A. 4th segment
B. 3rd segment
C. 8th segment
D. 9th segment.

Answer

To determine how far the buccal cavity extends in an earthworm, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure**: The buccal cavity in earthworms is described as a short, wide, and thin-walled tube. This anatomical feature is important for its function in feeding.

2. **Identify the Segments**: Earthworms have a segmented body plan. Each segment is numbered, starting from the anterior (head) end of the worm.

3. **Locate the Buccal Cavity**: The buccal cavity is located at the front of the earthworm. It is crucial to know which segments are involved in its structure.

4. **Determine the Extent**: According to the information provided, the buccal cavity extends from the second segment and reaches up to the middle of the third segment.

5. **Select the Correct Option**: Given the options:
- 1st option: 4th segment
- 2nd option: 3rd segment
- 3rd option: 8th segment
- 4th option: 9th segment

The correct answer is the second option, which is the 3rd segment.

### Final Answer:
The buccal cavity in an earthworm extends up to the **3rd segment**.

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