Which of the following set of plants exhibit homospory and homophilly?

Options

A. Selaginella, Salvinia, Azolla
B. Equisetum, Dryopteris, Lycopodium
C. Selaginella, Dryopteris, Adiantum
D. Salvinia, Equisetum, Azolla

Answer

To determine which set of plants exhibits homospory and homophily, we need to understand the definitions of these terms:

1. **Homospory**: This refers to the production of spores of the same size and type. Plants that exhibit homospory produce only one type of spore that can develop into a gametophyte.

2. **Homophily**: This refers to the condition where the gametophytes produced from the spores are morphologically similar, meaning they look alike.

Now, let's analyze the options provided:

1. **Option 1: Selaginella, Salvinia, Azolla**
- **Selaginella**: Exhibits heterospory (produces two types of spores).
- **Salvinia**: Exhibits heterospory.
- **Azolla**: Exhibits heterospory.
- **Conclusion**: This option does not exhibit homospory.

2. **Option 2: Equisetum, Dryopteris, Lycopodium**
- **Equisetum**: Exhibits homospory.
- **Dryopteris**: Exhibits homospory.
- **Lycopodium**: Exhibits homospory.
- **Conclusion**: This option exhibits homospory.

3. **Option 3: Selaginella, Dryopteris, Adiantum**
- **Selaginella**: Exhibits heterospory.
- **Dryopteris**: Exhibits homospory.
- **Adiantum**: Exhibits homospory.
- **Conclusion**: This option does not exhibit homospory.

4. **Option 4: Selaginella, Salvinia, Equisetum, Azolla**
- **Selaginella**: Exhibits heterospory.
- **Salvinia**: Exhibits heterospory.
- **Equisetum**: Exhibits homospory.
- **Azolla**: Exhibits heterospory.
- **Conclusion**: This option does not exhibit homospory.

After analyzing all the options, we can conclude that **Option 2: Equisetum, Dryopteris, Lycopodium** is the correct answer as it exhibits homospory.

### Step-by-Step Solution:
1. Understand the definitions of homospory and homophily.
2. Analyze each option for the presence of homospory.
3. Identify the plants in each option and their spore types.
4. Conclude which option contains plants that exhibit both homospory and homophily.