Vital system absent in Tapeworm is

Options

A. Nervous system
B. Digestive system
C. Excretory system
D. Reproductive system .

Answer

**Step-by-Step Solution:**

1. **Understanding the Organism**: Tapeworms belong to the phylum Platyhelminthes, which are commonly known as flatworms. They are parasitic organisms that live in the intestines of their hosts.

2. **Defining Parasitism**: Parasitism is a relationship where one organism (the parasite) benefits at the expense of another organism (the host). In the case of tapeworms, they derive nutrients from the host's digested food.

3. **Nutritional Adaptation**: Since tapeworms are parasitic, they do not need to digest food themselves. Instead, they absorb nutrients directly from the host's digestive system. This means they do not require a digestive system of their own.

4. **Identifying Vital Systems**: The question asks which vital system is absent in tapeworms. The options provided are:
- Nervous system
- Digestive system
- Excretory system
- Reproductive system

5. **Analyzing Each System**:
- **Nervous System**: Tapeworms do have a simple nervous system, which helps them respond to their environment.
- **Digestive System**: Tapeworms lack a digestive system because they absorb nutrients directly from the host.
- **Excretory System**: Tapeworms possess an excretory system to remove waste products.
- **Reproductive System**: Tapeworms have a well-developed reproductive system, allowing them to produce numerous eggs.

6. **Conclusion**: The only vital system that is absent in tapeworms is the digestive system. Therefore, the correct answer is the digestive system.

**Final Answer**: The vital system absent in tapeworms is the **digestive system**.

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