Which one is product in respiration and reagent in photosynthesis?

Options

A. `O_(2)`
B. `CO_(2)`
C. `CO`
D. `N_(2)`.

Answer

To solve the question "Which one is a product in respiration and reagent in photosynthesis?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Processes**:
- **Photosynthesis**: This is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. The general equation for photosynthesis is:
\[ 6 \text{CO}_2 + 6 \text{H}_2\text{O} \xrightarrow{\text{light energy}} \text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \]
- **Respiration**: This is the process by which cells break down glucose into energy, using oxygen. The general equation for respiration is:
\[ \text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O} + \text{energy (ATP)} \]

2. **Identify the Products and Reagents**:
- In photosynthesis, the reagents (inputs) are carbon dioxide (CO₂) and water (H₂O), and the products (outputs) are glucose (C₆H₁₂O₆) and oxygen (O₂).
- In respiration, the reagents are glucose (C₆H₁₂O₆) and oxygen (O₂), and the products are carbon dioxide (CO₂) and water (H₂O).

3. **Analyze the Options**:
- The options given are:
- A) Oxygen
- B) Carbon Dioxide
- C) Carbon Monoxide
- D) Nitrogen
- From the reactions, we see that carbon dioxide (CO₂) is produced during respiration and is used as a reagent in photosynthesis.

4. **Select the Correct Answer**:
- Since carbon dioxide is produced in respiration and used in photosynthesis, the correct answer is:
\[ \text{B) Carbon Dioxide (CO}_2\text{)} \]

### Final Answer:
The product in respiration and reagent in photosynthesis is **B) Carbon Dioxide (CO₂)**.