Some experiments were carried out using Croton sp. plants to understand the process of photosynthesis. It was observed that the leaves of the plant exposed to light for longer duration accumulated more starch. However, due to presence of pre-formed starch in the leaves, it was difficult to find the net productivity on a fixed exposure to light source. Therefore, it was necessary to obtain starch free leaves in the plant before starting the experiment.
The equation given below represents photosynthesis. Identify P and Q.
`P + "water" overset("sunlight")underset("chlorophyll")rarr "glucose + Q"`

Options

A. P-Carbon dioxide, Q - Oxygen
B. P- Oxygen, Q - Oxygen
C. P-Carbon dioxide, Q - Carbon dioxide
D. P- Oxygen, Q - Carbon dioxide

Explanation

To solve the question, we need to identify the components involved in the process of photosynthesis represented by the equation:

`P + "water" overset("sunlight")underset("chlorophyll")rarr "glucose + Q"`

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
Photosynthesis is the process by which green plants use sunlight to synthesize foods with the help of chlorophyll. The primary reactants in this process are carbon dioxide and water, which are converted into glucose and oxygen.

2. **Identifying P**:
In the equation, P represents one of the reactants in the photosynthesis process. Since we know that plants take in carbon dioxide (CO2) during photosynthesis, we can conclude that P is carbon dioxide.

3. **Identifying Q**:
The products of photosynthesis include glucose and oxygen. In the equation, Q represents one of the products. Since oxygen (O2) is released as a byproduct of photosynthesis, we can conclude that Q is oxygen.

4. **Finalizing the Equation**:
Therefore, the complete equation can be written as:
`Carbon Dioxide + Water overset("sunlight")underset("chlorophyll")rarr Glucose + Oxygen`

5. **Conclusion**:
Based on the above analysis, we identify:
- P = Carbon Dioxide
- Q = Oxygen

### Final Answer:
P = Carbon Dioxide; Q = Oxygen