The typhlosole in an earthworm is a structure that plays a crucial role in its digestive system. It is a fold of the intestinal wall that increases the surface area for nutrient absorption. The location of the typhlosole in the earthworm can vary, but in general, it starts from segment 26.

Explanation:
1. Earthworm Anatomy:
- Earthworms have long, tube-like bodies that are divided into segments called metameres or somites.
- The first segment is called the prostomium, and the last segment is called the pygidium.
- The segments in between are numbered sequentially from the anterior to the posterior end.

2. Typhlosole Function:
- The typhlosole is a specialized structure found in the intestine of earthworms.
- It increases the surface area of the intestine, allowing for more efficient absorption of nutrients from the ingested soil and organic matter.

3. Location of Typhlosole:
- The typhlosole starts from a specific segment in the earthworm's body.
- According to the given information, the typhlosole in an earthworm begins from segment 26.

4. Importance of Typhlosole:
- The typhlosole greatly enhances the earthworm's ability to extract nutrients from its environment.
- The increased surface area provided by the typhlosole allows for more efficient absorption of organic matter and minerals present in the ingested soil.

5. Other Earthworm Segments:
- While the typhlosole starts from segment 26, it is important to note that the earthworm's digestive system extends throughout its entire body.
- The digestive system includes other structures like the pharynx, esophagus, crop, gizzard, intestine, and anus, which span multiple segments.

In conclusion, the typhlosole in an earthworm begins from segment 26. This specialized fold of the intestinal wall increases the surface area for nutrient absorption, contributing to the earthworm's efficient digestive system.

According to Ncert its given that typhosole begins from anterior end of 27 segment and increases absorptive surface area