_________ fertilization takes place in land animals such as insects, birds, dogs, cats, cattle and human beings.

Options

A. External
B. Internal
C. Both (a) and (b)
D. Bisexual

Answer

**Step-by-Step Text Solution:**

1. **Understanding Fertilization Types**: Fertilization can be categorized into two main types: internal and external. Internal fertilization occurs inside the female body, while external fertilization takes place outside the female body.

2. **Identifying the Animals**: The question mentions various land animals, including insects, birds, dogs, cats, cattle, and human beings.

3. **Analyzing Fertilization in Each Animal**:
- **Insects**: Many insects undergo internal fertilization, although some may have different methods.
- **Birds**: Birds also exhibit internal fertilization, where the male fertilizes the eggs inside the female.
- **Dogs and Cats**: Both of these mammals reproduce through internal fertilization.
- **Cattle**: Cattle, being mammals, also utilize internal fertilization.
- **Humans**: Human beings reproduce through internal fertilization.

4. **Conclusion**: Since all the mentioned animals (insects, birds, dogs, cats, cattle, and humans) primarily undergo internal fertilization, the answer to the question is "Internal Fertilization."

**Final Answer**: Internal Fertilization

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