Plants do not get benefits from

Options

A. `N_(2)` in air
B. `O_(2)` in air
C. `CO_(2)` in air
D. `O_(3)` in air

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which element or compound plants do not benefit from among the given options: nitrogen in air, oxygen in air, carbon dioxide in air, and ozone in air.

2. **Analyzing Each Option**:
- **Nitrogen in Air**: Nitrogen is essential for plants as it is a key component of amino acids, proteins, and nucleic acids. Plants benefit from nitrogen, especially in the form of nitrates.
- **Oxygen in Air**: While plants produce oxygen during photosynthesis, they also require oxygen for respiration. Therefore, they benefit from oxygen in the air.
- **Carbon Dioxide in Air**: Carbon dioxide is crucial for photosynthesis, where plants convert CO2 into glucose and oxygen. Thus, they benefit from carbon dioxide.
- **Ozone in Air**: Ozone (O3) is a harmful secondary air pollutant. It can damage plant tissues, leading to necrosis (cell death) and other harmful effects. Therefore, plants do not benefit from ozone.

3. **Identifying the Correct Answer**: Based on the analysis, the correct answer is **ozone in air** because it is harmful to plants, while the other options (nitrogen, oxygen, and carbon dioxide) are beneficial to them.

4. **Conclusion**: The correct option is ozone in air, as it does not provide any benefits to plants and can actually cause harm.