Two important intrinsic controls which are important in plant growth and development are

Options

A. PGRs
B. Genomic control
C. Both (a) and (b)
D. `O_(2)` concentration

Answer

To answer the question regarding the two important intrinsic controls that are crucial for plant growth and development, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding Plant Growth and Development**:
- Plant growth and development are influenced by various factors, which can be categorized into intrinsic and extrinsic controls.

2. **Defining Intrinsic Controls**:
- Intrinsic controls are internal factors that regulate growth and development. The two main intrinsic controls are genetic factors and hormonal factors.

3. **Identifying the Two Intrinsic Controls**:
- **Genetic Control**: This refers to the genetic makeup of the plant, which determines its growth patterns, development processes, and responses to environmental stimuli.
- **Hormonal Control**: This involves plant growth regulators (PGRs), also known as phytohormones, which include hormones such as auxins, cytokinins, gibberellins, ethylene, and abscisic acid. These hormones play significant roles in various growth processes, such as cell division, elongation, and differentiation.

4. **Conclusion**:
- The two important intrinsic controls in plant growth and development are:
- **1. Genetic Control**
- **2. Hormonal Control (PGRs)**

5. **Final Answer**:
- Therefore, the answer to the question is that the two important intrinsic controls are genetic control and hormonal control (PGRs).