If an earthworm is possessing 100 segments, rectum starts from 23rd, in how many segments typhosole is extended ? 

Options

A. a. 48
B. b. 50
C. c. 52
D. d. 49

Answer

To solve the question regarding the extension of the typhosole in an earthworm with 100 segments where the rectum starts from the 23rd segment, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Earthworm**:
- An earthworm is segmented, and in this case, it has a total of 100 segments.

2. **Identify the Starting Point of the Rectum**:
- The rectum begins at the 23rd segment.

3. **Determine the Starting Point of the Typhosole**:
- The typhosole, which is an internal fold of the intestine, starts from the 27th segment.

4. **Calculate the Number of Segments Occupied by the Typhosole**:
- The typhosole extends from the 27th segment to the segment just before the rectum starts (which is the 23rd segment).
- Since the rectum starts at the 23rd segment, we need to count the segments from 27 to 100 (the total number of segments).
- The segments occupied by the typhosole can be calculated as follows:
- Total segments = 100
- Segments before the rectum starts = 23
- Therefore, segments occupied by the typhosole = 100 - 23 = 77 segments.
- However, we need to consider that the typhosole starts from the 27th segment and goes up to the 100th segment.
- Thus, the number of segments occupied by the typhosole = 100 - 27 + 1 = 74 segments.

5. **Final Calculation**:
- The typhosole extends from the 27th segment to the 100th segment, which means it occupies 74 segments.

### Conclusion:
The typhosole is extended over **74 segments**.