Which of the following statements are true about photosynthesis?
1. In this process, solar energy is converted into chemical energy. 2. In photosynthesis, `CO_2` and` H_2O ` are used. 3. In photosynthesis, `CO_2` is released and `O_2` is consumed. 4. In photosynthesis, `O_2` is released and carbon monoxide is consumed.

Options

A. 3 and 4
B. 1 and 4
C. 1 and 2
D. 2 and 3

Explanation

To determine which statements about photosynthesis are true, let's analyze each statement step by step.

### Step 1: Analyze Statement 1
**Statement:** In this process, solar energy is converted into chemical energy.
**Analysis:** This statement is true. During photosynthesis, plants capture solar energy using chlorophyll and convert it into chemical energy stored in glucose.

### Step 2: Analyze Statement 2
**Statement:** In photosynthesis, CO2 and H2O are used.
**Analysis:** This statement is also true. Photosynthesis requires carbon dioxide (CO2) from the atmosphere and water (H2O) from the soil to produce glucose and oxygen.

### Step 3: Analyze Statement 3
**Statement:** In photosynthesis, CO2 is released and O2 is consumed.
**Analysis:** This statement is false. In photosynthesis, carbon dioxide (CO2) is consumed (used) to produce glucose, and oxygen (O2) is released as a byproduct.

### Step 4: Analyze Statement 4
**Statement:** In photosynthesis, O2 is released and carbon monoxide is consumed.
**Analysis:** This statement is also false. While oxygen (O2) is indeed released during photosynthesis, carbon monoxide (CO) is not consumed; it is toxic to plants and does not play a role in the process.

### Conclusion
Based on the analysis:
- Statement 1: True
- Statement 2: True
- Statement 3: False
- Statement 4: False

Thus, the true statements about photosynthesis are **1 and 2**.

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