Write the intrinsic and extrinsic growth factors.

Answer

### Step-by-Step Solution

**Step 1: Define Intrinsic Growth Factors**
Intrinsic growth factors are internal factors that influence the growth of an organism. They are primarily related to the organism's internal biological processes.

**Step 2: Identify Examples of Intrinsic Growth Factors**
1. **Enzymes**: These are biological catalysts that speed up chemical reactions in the body, facilitating growth and development.
2. **Hormones**: These are signaling molecules that regulate various physiological processes. In plants, important growth hormones include:
- **Auxins**: Promote root and shoot growth.
- **Gibberellins**: Aid in seed germination and stem elongation.
- **Cytokinins**: Stimulate cell division and growth.
- **Florigen**: Promotes flowering.

**Step 3: Define Extrinsic Growth Factors**
Extrinsic growth factors are external factors that affect the growth of an organism. These factors are influenced by the environment and external conditions.

**Step 4: Identify Examples of Extrinsic Growth Factors**
1. **Light Availability**: The amount and quality of light can significantly affect plant growth and development.
2. **Temperature**: Optimal temperature ranges are crucial for metabolic processes and overall growth.
3. **Water Availability**: Water is essential for photosynthesis and nutrient transport in plants.
4. **Climatic Conditions**: Weather patterns and seasonal changes can impact growth rates and development stages.

### Summary
- **Intrinsic Growth Factors**: Enzymes, hormones (Auxins, Gibberellins, Cytokinins, Florigen).
- **Extrinsic Growth Factors**: Light, temperature, water availability, climatic conditions.

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