Green plants do not give out `CO_(2)` during day time because they

Options

A. Store the same
B. Respire very slowly
C. Do not respire
D. Consume it in photosynthesis.

Answer

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Green plants perform photosynthesis, a process where they convert light energy into chemical energy to produce their own food. This process occurs primarily in the presence of sunlight.

2. **Role of Chlorophyll**:
- The green pigment chlorophyll in plants absorbs light energy, which is essential for photosynthesis. This energy is used to convert carbon dioxide (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2).

3. **Photosynthesis Process**:
- Photosynthesis occurs in two main stages: light reactions and dark reactions (Calvin cycle).
- **Light Reactions**: These occur in the thylakoid membranes of chloroplasts, where water is split (photolysis) to release oxygen and generate energy carriers (ATP and NADPH).
- **Dark Reactions**: These occur in the stroma of chloroplasts, where CO2 is fixed using the energy from ATP and NADPH produced in the light reactions to synthesize glucose.

4. **Carbon Dioxide Utilization**:
- During the day, when photosynthesis is actively occurring, plants consume CO2 from the atmosphere to produce glucose. This means that they do not release CO2 during the daytime because it is being used in the process of photosynthesis.

5. **Conclusion**:
- Therefore, the reason green plants do not give out CO2 during the daytime is that they consume it in the process of photosynthesis, particularly during the dark reactions.

### Final Answer:
Green plants do not give out CO2 during daytime because they consume it in the process of photosynthesis.