In moss antheridia and archegonia occur at the tips of two different branches of the same plant. The condition is called

Options

A. Monoecious and autoicous
B. Monoecious and paroicous
C. Monoecious and synoicous
D. Dioecious.

Answer

To solve the question regarding the occurrence of antheridia and archegonia at the tips of two different branches of the same moss plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structures**:
- Antheridia are the male reproductive structures in mosses, while archegonia are the female reproductive structures.

2. **Understand Their Arrangement**:
- In the case of mosses, antheridia and archegonia are found at the tips of different branches of the same plant.

3. **Define the Terms**:
- The term "monoecious" refers to a plant that has both male and female reproductive organs on the same individual.
- The term "dioecious" refers to plants that have male and female reproductive organs on separate individuals.

4. **Determine the Correct Condition**:
- Since both antheridia and archegonia are present on the same plant but at different branches, this condition is referred to as "monoecious."

5. **Conclusion**:
- Therefore, the condition where antheridia and archegonia occur at the tips of two different branches of the same moss plant is called "monoecious."

### Final Answer:
The condition is called **monoecious**.