Buccal cavity in earthwrom extends from

Options

A. 1th to 3rd segment
B. 1st to 7th segment
C. 3rd to 5th segment
D. 5th to 7th segment

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure of the Earthworm's Alimentary Canal:**
- The alimentary canal of an earthworm is divided into several parts, each located in different segments of the body.

2. **Identifying the Mouth:**
- The alimentary canal begins with the mouth, which is located at the terminal end of the earthworm.

3. **Locating the Buccal Cavity:**
- After the mouth, the alimentary canal continues into a short cavity known as the buccal cavity.

4. **Determining the Extent of the Buccal Cavity:**
- The buccal cavity is present in the first two-thirds of the body segments. Specifically, it extends from the first segment to the third segment of the earthworm.

5. **Continuing to Other Parts of the Alimentary Canal:**
- Following the buccal cavity, the alimentary canal continues into the pharynx, which is located in the fourth segment.

6. **Conclusion:**
- Therefore, the buccal cavity in an earthworm extends from the first segment to the third segment of the body.

**Final Answer:**
The buccal cavity in an earthworm extends from the first segment to the third segment.

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