Select the incorrect statement with respect to the prothallus of pteridophyta.

Options

A. It is gametophytic phase .
B. It is multicellular and free-living .
C. It is well differentiated with vascular tissue .
D. It is small and undifferentiated.

Answer

To solve the question regarding the incorrect statement about the prothallus of pteridophytes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Prothallus**: The prothallus is the gametophyte stage of pteridophytes, which includes ferns and horsetails. It is a small, free-living structure that is typically photosynthetic.

2. **Identify Characteristics of Prothallus**:
- It is **multicellular**.
- It is **free-living**.
- It is **small** in size.
- It is generally **undifferentiated** (meaning it does not have specialized tissues like vascular tissues).

3. **Examine the Statements**: The question asks us to select the incorrect statement regarding the prothallus. We need to evaluate each option given in the question to identify which one does not align with the characteristics of the prothallus.

4. **Analyze the Options**:
- If an option states that the prothallus has vascular tissues, it would be incorrect, as prothallus is undifferentiated and lacks vascular tissues.
- If an option describes the prothallus as being part of the sporophyte generation, that would also be incorrect since the prothallus is part of the gametophyte generation.

5. **Select the Incorrect Statement**: After analyzing the options, we can conclude that the statement claiming the prothallus has vascular tissues is incorrect.

### Conclusion:
The incorrect statement with respect to the prothallus of pteridophyta is that it is well differentiated with vascular tissue.

---