Plant response to environment is mainly through

Options

A. Induction of dormancy
B. Abscission of parts
C. Synthesis of pigments
D. Growth.

Answer

To answer the question "Plant response to environment is mainly through," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Plant Responses**:
- Plants respond to their environment in various ways. These responses can be classified into different types such as phototropism and geotropism.

2. **Identifying Phototropism**:
- Phototropism refers to the growth of plant parts (like stems) towards light. This is a crucial response as plants need light for photosynthesis.

3. **Identifying Geotropism**:
- Geotropism is the growth of plant parts (like roots) in response to gravity. Roots typically grow downward, anchoring the plant and seeking water and nutrients.

4. **Growth as a Response Mechanism**:
- Both phototropism and geotropism involve growth. The common factor in these responses is that they are driven by the growth of the plant.

5. **Defining Growth**:
- Growth in plants is defined as the irreversible increase in size of an organ. This means that when plants grow in response to environmental stimuli, it leads to a permanent change in size.

6. **Excluding Other Responses**:
- Other processes such as dormancy, abscission, or pigment synthesis do not primarily mediate the plant's response to the environment. They are more about survival, shedding leaves, or coloration rather than direct growth responses.

7. **Conclusion**:
- Therefore, the main way plants respond to their environment is through growth processes, making the correct answer option number four.