In aerobic respiration which of the following is a reactant

Options

A. `CO_(2)`
B. `O_(2)`
C. `H_(2)O`
D. Sugars

Answer

### Step-by-Step Solution:

1. **Understanding Reactants and Products**:
- In any chemical reaction, reactants are the substances that undergo change, while products are the substances formed as a result of the reaction.

2. **Identifying the Process of Aerobic Respiration**:
- Aerobic respiration is a biological process where glucose (C6H12O6) is broken down in the presence of oxygen to produce energy. The general equation for aerobic respiration can be represented as:
\[ \text{Glucose} + \text{Oxygen} \rightarrow \text{Carbon Dioxide} + \text{Water} + \text{Energy (ATP)} \]

3. **Analyzing the Given Options**:
- The options provided are:
- A) Carbon Dioxide
- B) Oxygen
- C) Water
- D) Sugars
- We need to determine which of these is a reactant in the context of aerobic respiration.

4. **Evaluating Each Option**:
- **Carbon Dioxide**: This is a product of aerobic respiration, not a reactant.
- **Oxygen**: This is essential for aerobic respiration and is consumed in the process, making it a reactant.
- **Water**: This is also a product formed during the process of aerobic respiration.
- **Sugars**: While glucose is a type of sugar, the term "sugars" is too broad and does not specify that we are referring to glucose, which is the primary reactant in aerobic respiration.

5. **Conclusion**:
- Based on the analysis, the only correct reactant in the context of aerobic respiration is **Oxygen**. Therefore, the correct answer is **Option B: Oxygen**.