In pheretima accessory glands are present in which segments-

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question refers to "Pheretima," which is a genus of earthworms. It is important to recognize that Pheretima is commonly used to refer to earthworms in general.

2. **Locate Accessory Glands**: Accessory glands in earthworms are specialized glands that play a role in reproduction.

3. **Determine the Segments**: According to biological studies, the accessory glands in Pheretima are specifically located in the 17th and 19th segments of the body.

4. **Description of Accessory Glands**: These glands are described as paired, rounded, and white fluffy masses. They are situated in the ventrolateral body wall, which means they are located on the underside and towards the sides of the earthworm's body.

5. **Positioning Relative to Other Structures**: The accessory glands are positioned one on either side of the nerve cord, indicating their bilateral symmetry in the organism.

**Final Answer**: In Pheretima, accessory glands are present in the 17th and 19th segments.

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