An important character not present in platyhelminthes is

Options

A. monoecious
B. Vitelline glands
C. Flat animals
D. Flame cells

Answer

To solve the question regarding an important character not present in Platyhelminthes, we will analyze the characteristics of this group of organisms step by step.

### Step-by-Step Solution:

1. **Understand Platyhelminthes**:
- Platyhelminthes, commonly known as flatworms, are characterized by their dorsoventrally flattened bodies and bilateral symmetry. They are triploblastic, meaning they have three germ layers: ectoderm, mesoderm, and endoderm.

2. **Identify Key Features**:
- They are acoelomates, which means they lack a true coelom (body cavity).
- Many Platyhelminthes are endoparasites, living inside the bodies of their hosts, such as humans and other animals. Examples include liver flukes and tapeworms.

3. **Examine the Options**:
- The question provides several options, and we need to determine which characteristic is not present in Platyhelminthes.
- One option mentions that they are monoecious (hermaphroditic), which is true for many flatworms, allowing them to have both male and female reproductive organs.
- Another option refers to the presence of vitelline glands.

4. **Evaluate the Presence of Vitelline Glands**:
- Vitelline glands are involved in the production of yolk for eggs in some organisms, but they are not present in all Platyhelminthes.
- In fact, many flatworms do not possess these glands, especially the parasitic forms.

5. **Conclusion**:
- After evaluating the characteristics and the options, it is clear that the presence of vitelline glands is an important character that is not found in Platyhelminthes. Therefore, the correct answer to the question is option number 2: vitelline glands.

### Final Answer:
The important character not present in Platyhelminthes is **vitelline glands**.

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