Zygote is formed by the process of

Options

A. Isogamy
B. Anisogamy
C. Oogamy
D. Syngamy.

Answer

To answer the question "Zygote is formed by the process of," we will analyze the options provided and explain the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Zygote Formation**:
- A zygote is the initial cell formed when two gametes (sperm and egg) fuse during fertilization. This process is crucial for sexual reproduction.

2. **Identifying the Processes**:
- The options given are:
A. Isogamy
B. Anisogamy
C. Oogamy
D. Syngamy

3. **Defining Each Process**:
- **Isogamy**: This is the fusion of two similar gametes (same size and shape). It is common in some algae and fungi.
- **Anisogamy**: This refers to the fusion of two dissimilar gametes (different sizes), typically a larger egg and a smaller sperm. This is common in many animals.
- **Oogamy**: This is a form of anisogamy where the female gamete is large and non-motile (egg), and the male gamete is small and motile (sperm).
- **Syngamy**: This is the process of fertilization where the male and female gametes fuse to form a zygote. It is also known as amphimixis.

4. **Conclusion**:
- The correct answer is **D. Syngamy**, as it specifically refers to the fertilization process that leads to the formation of a zygote.

### Final Answer:
The zygote is formed by the process of **syngamy** (option D).

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