Intrinsic factors affecting development include

Options

A. Intracellular (genetic) factors
B. Intercellular factors like light
C. Intercellular factors like PGRS
D. a and c

Answer

**Step-by-Step Solution:**

1. **Understanding Intrinsic Factors**:
- Intrinsic factors are internal factors that affect the development of plants. They are primarily genetic and hormonal in nature.

2. **Types of Intrinsic Factors**:
- Intrinsic factors can be categorized into two types:
- **Intercellular Intrinsic Factors**: These factors involve interactions between cells.
- **Intracellular Intrinsic Factors**: These factors are related to the genetic makeup and hormonal influences within the cells.

3. **Genetic Factors (Intracellular Intrinsic Factors)**:
- Genetic factors are crucial as they define the characteristics of the plant. These factors are referred to as the genotype, which is the complete set of genetic material in a plant. The genotype determines specific traits and characteristics of the plant.

4. **Plant Growth Regulators (PGRs)**:
- PGRs, also known as plant hormones or phytohormones, are another category of intrinsic factors that influence plant development. They regulate various growth processes and can be classified into two main groups:
- **Plant Growth Hormones**: These promote growth.
- **Plant Inhibiting Hormones**: These inhibit growth.

5. **Examples of Plant Hormones**:
- Some key examples of plant hormones include:
- **Abscisic Acid**: Involved in stress responses.
- **Gibberellic Acid**: Promotes stem elongation and seed germination.
- **Ethylene**: Affects fruit ripening and flower wilting.
- **Cytokinins**: Promote cell division and growth.

6. **Conclusion**:
- The intrinsic factors affecting development include both genetic factors (genotype) and plant growth regulators (hormones). Therefore, options related to these factors can be considered correct.