Heterospory and origin of seed habit was noticed for the first time in :-

Options

A. Isoetes
B. Lycopodium
C. Selaginella
D. Dryopteris

Answer

To solve the question regarding where heterospory and the origin of seed habit were first noticed, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Heterospory**: Heterospory refers to the production of two different types of spores by a plant: microspores (male) and megaspores (female). This is an important evolutionary step leading to the development of seeds.

2. **Identifying the Options**: The options provided are:
- A) I seed
- B) Lycopodium
- C) Cileginella
- D) Dryopteris

3. **Analyzing Each Option**:
- **I seed**: This term is not specific to any known plant and does not relate to heterospory.
- **Lycopodium**: This is a genus of clubmosses that typically exhibits homospory, meaning it produces only one type of spore.
- **Cileginella**: This is known as a heterosporous pteridophyte, which means it produces both microspores and megaspores. This is significant in the evolution of seed plants.
- **Dryopteris**: This is a genus of ferns that also typically exhibits homospory.

4. **Conclusion**: Based on the analysis, Cileginella is the correct answer as it is the first plant where heterospory and the origin of seed habit were noticed.

### Final Answer:
Heterospory and the origin of seed habit were first noticed in **Cileginella**.

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