Which of the following plants are heterosporous ?
1 Selaginella, Lycopodium
2 Pteris, Adiantum
3 Psilotum, Equisetum
4 Selaginella, Salvinia

Options

A. Selaginella, Lycopodium
B. Pteris, Adiantum
C. Psilotum, Equisetum
D. Selaginella, Salvinia

Answer

To determine which of the listed plants are heterosporous, we need to understand the concept of heterospory and identify the plants mentioned in the options.

### Step-by-Step Solution:

1. **Understand Heterospory**:
- Heterospory is the production of two different types of spores: megaspores (female) and microspores (male). This is in contrast to homospory, where only one type of spore is produced.

2. **Identify the Plants in Each Option**:
- **Option 1**: Selaginella, Lycopodium
- **Option 2**: Pteris, Adiantum
- **Option 3**: Psilotum, Equisetum
- **Option 4**: Selaginella, Salvinia

3. **Analyze Each Option**:
- **Option 1 (Selaginella, Lycopodium)**:
- Selaginella is heterosporous.
- Lycopodium is homosporous.
- Conclusion: This option is incorrect.

- **Option 2 (Pteris, Adiantum)**:
- Both Pteris and Adiantum are homosporous.
- Conclusion: This option is incorrect.

- **Option 3 (Psilotum, Equisetum)**:
- Both Psilotum and Equisetum are homosporous.
- Conclusion: This option is incorrect.

- **Option 4 (Selaginella, Salvinia)**:
- Selaginella is heterosporous.
- Salvinia is also heterosporous.
- Conclusion: This option is correct.

4. **Final Answer**:
- The plants that are heterosporous among the given options are **Selaginella and Salvinia** (Option 4).