Asexual reproduction is absent in

Options

A. Planaria
B. Hydra
C. Sycon
D. Periplaneta

Answer

To determine which organism does not reproduce asexually among the given options, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Understanding Asexual Reproduction**:
- Asexual reproduction involves only one parent and does not require the fusion of gametes. Common methods include binary fission, budding, and fragmentation.

2. **Analyzing Option 1: Planaria**:
- Planaria are known to reproduce asexually through a process called binary fission. This means they can split into two separate organisms. Thus, Planaria do reproduce asexually.

3. **Analyzing Option 2: Hydra**:
- Hydra reproduces asexually by budding. In this process, small bulges (buds) form on the body of the Hydra and eventually detach to become new individuals. Therefore, Hydra also reproduces asexually.

4. **Analyzing Option 3: Cycone**:
- Cycone can reproduce both asexually and sexually. Asexual reproduction occurs through budding and the formation of gemmules. Hence, Cycone does have asexual reproduction.

5. **Analyzing Option 4: Periplaneta**:
- Periplaneta (commonly known as cockroaches) are dioecious organisms, meaning they have distinct male and female individuals. They reproduce sexually, with well-developed male and female reproductive systems. There is no known asexual reproduction in Periplaneta.

6. **Conclusion**:
- Based on the analysis, the organism in which asexual reproduction is absent is **Periplaneta**.

### Final Answer:
**Periplaneta**