In which of the following group, all the organisms are homosporous

Options

A. (a) Funaria, Salvinia, Dryopteris
B. (b) Azolla, Selaginella, Anthoceros
C. (c) Salvinia, Cedrus, Funaria
D. (d) Sphagnum, Pteris, Adiantum

Answer

To determine which group of organisms is entirely homosporous, we need to understand the definitions and characteristics of homospory and heterospory.

### Step-by-Step Solution:

1. **Define Homospory**:
- Homospory is a condition where all spores produced by an organism are identical in size and shape. This means that there is no differentiation between male and female spores.

2. **Define Heterospory**:
- In contrast, heterospory refers to the production of two different types of spores: microspores (smaller, male) and macrospores (larger, female). This condition is commonly found in angiosperms and gymnosperms.

3. **Identify Groups of Organisms**:
- We need to analyze the given options to see which groups consist entirely of homosporous organisms.
- The options include:
- A. Salvinia
- B. Selaginella and Azolla
- C. Salvinia
- D. Sphagnum, Terris, and Adanchum

4. **Evaluate Each Option**:
- **Option A (Salvinia)**: Salvinia is heterosporous, so this option is incorrect.
- **Option B (Selaginella and Azolla)**: Both Selaginella and Azolla are also heterosporous, making this option incorrect.
- **Option C (Salvinia)**: Again, Salvinia is heterosporous, so this option is incorrect.
- **Option D (Sphagnum, Terris, and Adanchum)**: All these organisms are homosporous, making this the correct option.

5. **Conclusion**:
- The group that consists entirely of homosporous organisms is **Option D: Sphagnum, Terris, and Adanchum**.

### Final Answer:
**D. Sphagnum, Terris, and Adanchum** are all homosporous organisms.