Read the following statements about embryogenesis and select the incorrect option.

Options

A. It is the process of development of embryo from zygote.
B. During this process, zygote undergoes cell division and cell differentiation.
C. Cell divisions decrease the number of cells in developin embryo.
D. Cell differentiation helps groups of cells to undergo certain modification to form specialised tissues and organs.

Explanation

### Step-by-Step Solution:

1. **Understanding Embryogenesis**:
- Embryogenesis is the process of development of an embryo from a zygote, which is formed by the fertilization of an egg by a sperm.

2. **Analyzing the Statements**:
- We need to evaluate four statements regarding embryogenesis to identify the incorrect one.

3. **Evaluating Each Statement**:
- **Statement 1**: "The process of development of embryo from the zygote."
- This is correct because embryogenesis indeed begins with the zygote.

- **Statement 2**: "During this process, zygote undergoes cell division and cell differentiation."
- This is also correct as the zygote undergoes multiple cell divisions and differentiations to develop into an embryo.

- **Statement 3**: "Cell divisions decrease the number of cells in the developing embryo."
- This statement is incorrect. In fact, cell divisions increase the number of cells in the developing embryo, not decrease them.

- **Statement 4**: "Cell differentiation helps groups of cells to undergo certain modifications to form specialized tissue and organs."
- This statement is correct because differentiation allows groups of cells to develop into specialized tissues and organs.

4. **Identifying the Incorrect Statement**:
- Upon evaluation, Statement 3 is the incorrect option as it contradicts the fundamental principle of embryogenesis, where cell divisions lead to an increase in cell number.

5. **Conclusion**:
- The incorrect option regarding embryogenesis is **Statement 3**.