Multiple choice questions (MCQs)
choose the correct option
Greatest biological problems faced by human beings is

Options

A. Population explosion
B. Depletion of ozone layer
C. Depletion of natural resources
D. Land erosion

Answer

To solve the question regarding the greatest biological problem faced by human beings, we will analyze the options provided and determine which one qualifies as a biological issue.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Population explosion
- B) Depletion of ozone layer
- C) Depletion of natural resources
- D) Land erosion

2. **Analyze Each Option**:
- **A) Population explosion**: This refers to the rapid increase in the human population. It is a biological issue because it directly relates to human reproduction and survival.
- **B) Depletion of ozone layer**: This is primarily an environmental issue. While it affects human health, it does not directly relate to biological processes.
- **C) Depletion of natural resources**: This is also an environmental concern, affecting the availability of resources but not a biological problem in itself.
- **D) Land erosion**: This is an environmental issue that affects agriculture and ecosystems but is not a biological problem.

3. **Determine the Greatest Biological Problem**: Among the options, the only one that is fundamentally a biological issue is the population explosion. It is linked to human reproduction, health, and societal impacts.

4. **Conclusion**: Therefore, the correct answer is **A) Population explosion**.