In the experiment to demonstrate that `CO_(2)` is given out during respiration, what would you observe in the delivery tube dipped in water?

Options

A. Water level rises in the delivery tube
B. Water turns milky and rises in the delivery tube
C. Water turns milky but does not rise in the delivery tube
D. Water level in the delivery tube remains unchanged

Answer

To answer the question regarding the observation in the delivery tube dipped in water during the experiment to demonstrate that CO₂ is given out during respiration, we can follow these steps:

### Step-by-Step Solution:

1. **Setup the Experiment**:
- Use germinating seeds, as they are metabolically active and will respire quickly.
- Place the seeds in a conical flask and seal it with a cork. The cork should have a bent glass delivery tube inserted into it.

2. **Introduce KOH Solution**:
- Place a KOH (potassium hydroxide) solution in the flask. KOH is used because it absorbs carbon dioxide (CO₂).

3. **Connect the Delivery Tube**:
- The delivery tube should be connected to a beaker filled with water. The end of the delivery tube should be submerged in the water.

4. **Observe the Respiration Process**:
- As the germinating seeds respire, they will release CO₂. However, since KOH absorbs CO₂, the gas will not remain in the flask.

5. **Vacuum Creation**:
- As KOH absorbs the CO₂ released by the seeds, a vacuum is created in the flask. This vacuum causes a drop in pressure inside the flask.

6. **Water Movement**:
- Due to the created vacuum, water from the beaker will be drawn up into the delivery tube to fill the space left by the absorbed CO₂.

7. **Final Observation**:
- The final observation in the delivery tube will be that the water level rises. This rise in water level indicates that CO₂ is being produced by the seeds and absorbed by KOH, leading to a vacuum that pulls water up the tube.

### Conclusion:
The correct observation in the delivery tube dipped in water is that the water level rises in the delivery tube.