Growth occurs when

Options

A. Anabolism is higher than catobolism
B. Catabolism is higher than anabolism
C. Protoplasmic synthesis is more than apoplasmatic synthesis
D. Apoplasmatic synthesis is more than protoplasmic synthesis.

Answer

### Step-by-Step Text Solution

1. **Understanding Growth**: Growth in living organisms is primarily a result of metabolic processes. Metabolism encompasses all chemical reactions occurring within the body, which can be divided into two main categories: anabolism and catabolism.

2. **Defining Anabolism and Catabolism**:
- **Anabolism**: This is the process of synthesis, where larger molecules are built from smaller ones. It is associated with the growth and building of tissues.
- **Catabolism**: This is the process of breakdown, where larger molecules are broken down into smaller ones, releasing energy.

3. **Relationship Between Anabolism and Catabolism**:
- For growth to occur, the rate of anabolism must exceed the rate of catabolism. This means that more substances are being synthesized than are being broken down.
- If anabolism equals catabolism, there is no net growth, meaning the organism maintains its size but does not increase.
- If catabolism exceeds anabolism, the organism experiences negative growth, leading to a decrease in size or mass.

4. **Analyzing the Options**:
- **Option 1**: Anabolism is higher than catabolism – This indicates positive growth, as more materials are being synthesized than broken down.
- **Option 2**: Catabolism is higher than anabolism – This indicates negative growth, as more materials are being broken down than synthesized.
- **Option 3**: Protoplasmic synthesis is more than apoplasmatic synthesis – While both types of synthesis contribute to growth, this option does not directly address the relationship necessary for growth.
- **Option 4**: Apoplasmatic synthesis is more than protoplasmatic synthesis – Similar to option 3, this does not provide a clear indication of growth.

5. **Conclusion**: The correct answer is **Option 1**: Growth occurs when anabolism is higher than catabolism, indicating that the synthesis of materials exceeds their breakdown.