In reptiles, birds, mammals, gymnosperms and angiosperms the fertilisation is

Options

A. External
B. Internal
C. Both (1) and (2)
D. Can't say

Answer

To answer the question regarding the type of fertilization that occurs in reptiles, birds, mammals, gymnosperms, and angiosperms, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Groups**: Recognize that reptiles, birds, mammals, gymnosperms, and angiosperms belong to two main categories: animals (reptiles, birds, mammals) and plants (gymnosperms and angiosperms).

2. **Understand Fertilization Types**:
- **External Fertilization**: This occurs outside the female's body, typically in water, where the male and female gametes meet.
- **Internal Fertilization**: This occurs inside the female's body, where the male gametes are deposited directly into the female reproductive tract.

3. **Analyze Each Group**:
- **Reptiles**: Most reptiles exhibit internal fertilization, where the male deposits sperm inside the female.
- **Birds**: Birds also practice internal fertilization, where sperm is transferred to the female during mating.
- **Mammals**: All mammals undergo internal fertilization, where fertilization occurs within the female's body.
- **Gymnosperms**: In gymnosperms, fertilization occurs internally as the pollen (male gamete) reaches the ovule (female gamete) within the ovule.
- **Angiosperms**: Similarly, angiosperms also have internal fertilization, where pollen fertilizes the ovule inside the ovary.

4. **Conclusion**: Since all the mentioned groups (reptiles, birds, mammals, gymnosperms, and angiosperms) exhibit internal fertilization, we conclude that the correct answer to the question is "internal."

### Final Answer:
The correct option for the question is **internal**.

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