Which of the following statements is incorrect ?

Options

A. In some pteridophytes (Selaginella, salvinia ) sporophylls may form distinct compact structures called or cones .
B. The pteridophytes include Horsetails and Ferns
C. In Peterborough , the main plant body is a sporophyte
D. In Pteridophyta sexual reproduction is isogamous

Answer

To solve the question, "Which of the following statements is incorrect?" we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Statement 1: In some pteridophytes, Selaginella and Salvinia, sporophylls may form distinct compact structures called strobili.**
- **Analysis:** This statement is correct. In pteridophytes like Selaginella and Salvinia, sporophylls can indeed aggregate to form structures known as strobili (or cones).

2. **Statement 2: The pteridophytes include horsetails and ferns.**
- **Analysis:** This statement is also correct. Horsetails (Equisetum) and ferns (Pteridophyta) are both classified under the group of pteridophytes.

3. **Statement 3: The main plant body of pteridophytes is a sporophyte.**
- **Analysis:** This statement is correct as well. In pteridophytes, the dominant and visible stage of the life cycle is the sporophyte, which is diploid.

4. **Statement 4: The sexual reproduction in pteridophytes is isogamous.**
- **Analysis:** This statement is incorrect. Pteridophytes exhibit oogamous reproduction, where the male gamete (sperm) is motile and the female gamete (egg) is non-motile. Isogamous reproduction involves gametes that are similar in size and shape, which is not the case in pteridophytes.

### Conclusion:
The incorrect statement among the options is **Statement 4**: "The sexual reproduction in pteridophytes is isogamous."