Which ones are not hermaphrodite ?

Options

A. Polychaetes
B. Leeches
C. Flatworms
D. Earthworm

Answer

To determine which organisms among the given options are not hermaphrodites, we will analyze each option based on the definition of hermaphroditism.

### Step-by-Step Solution:

1. **Understand the Definition of Hermaphrodite**:
- Hermaphrodites are organisms that possess both male and female reproductive organs within the same individual. This means they can produce both sperm and eggs.

2. **Analyze Each Option**:
- **Polychaete**:
- Polychaetes are a class of annelids that typically have separate sexes (dioecious). They do not possess both male and female reproductive organs in the same individual. Therefore, polychaetes are **not hermaphrodites**.
- **Leech**:
- Leeches are known to be hermaphrodites. Each individual has both male and female reproductive organs.
- **Flatworm**:
- Flatworms (Platyhelminthes) are also hermaphroditic. They have both male and female reproductive structures within the same organism.
- **Earthworm**:
- Earthworms are another example of hermaphroditic organisms. They possess both male and female reproductive organs.

3. **Conclusion**:
- From the analysis, the only organism that is not a hermaphrodite is the **polychaete**. The other options (leeches, flatworms, and earthworms) are all hermaphrodites.

### Final Answer:
The organism that is not hermaphrodite is **polychaete**.