During respiration there is :

Options

A. loss in dry weight
B. no change in dry weight
C. increase in the overall weight
D. gain in dry weight

Answer

### Step-by-Step Solution:

1. **Understanding Respiration**: Respiration is a vital process in living organisms where complex organic molecules (like carbohydrates, proteins, and fats) are broken down into simpler molecules. This process releases energy that is used for various metabolic activities.

2. **Identifying the Nature of Respiration**: Respiration is a catabolic process, meaning it involves the breakdown of larger molecules into smaller ones, resulting in the release of energy.

3. **Examining the Effect on Dry Weight**: During respiration, complex organic molecules are metabolized. As these molecules are broken down, they are used up in the process, which leads to a decrease in the overall dry weight of the organism.

4. **Comparing with Photosynthesis**: In contrast, photosynthesis is an anabolic process where simple molecules are used to create complex organic molecules, leading to an increase in dry weight. However, during respiration, since the complex molecules are consumed, the dry weight decreases.

5. **Evaluating the Options**:
- **Loss in dry weight**: This is correct because the breakdown of complex molecules results in a decrease in dry weight.
- **No change in dry weight**: This is incorrect as there is a definite change in dry weight.
- **Increase in overall weight**: This is incorrect as respiration does not lead to an increase in weight.
- **Gain in dry weight**: This is also incorrect because, as stated, respiration leads to a loss in dry weight.

6. **Conclusion**: The correct answer to the question is **loss in dry weight**.