Which of the following are homosporous pteridophytes :(i) Selaginella (ii) Lycopodium (iii) Salvinia (iv) Equisetum

Options

A. I and IV only
B. II and III only
C. II and IV only
D. III and IV only

Answer

To determine which of the given options are homosporous pteridophytes, we will analyze each option based on their reproductive characteristics.

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Homosporous**: Plants that produce spores of the same size and type.
- **Heterosporous**: Plants that produce two different types of spores (macrospores and microspores).

2. **Analyze Each Option**:
- **(i) Selaginella**: This plant is known to be heterosporous, producing both microspores and macrospores.
- **(ii) Lycopodium**: This plant is homosporous, producing only one type of spore.
- **(iii) Salvinia**: This plant is also heterosporous, producing different sizes of spores.
- **(iv) Equisetum**: This plant is homosporous, producing only one type of spore.

3. **Identify Homosporous Pteridophytes**:
- From the analysis, we find that Lycopodium and Equisetum are the only homosporous pteridophytes among the options given.

4. **Conclusion**:
- The correct answer is that the homosporous pteridophytes from the given options are **(ii) Lycopodium and (iv) Equisetum**.

### Final Answer:
The homosporous pteridophytes from the options provided are **Lycopodium and Equisetum** (options ii and iv).

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