Tropical forests are dense due to

Options

A. Low rainfall and low temperature
B. High rainfall and low temperature
C. Low rainfall and high temperature
D. High rainfall and high temperature

Answer

### Step-by-Step Solution:

1. **Understanding Tropical Forests**: Tropical forests are characterized as dense, closed canopy forests that are typically found near the equator.

2. **Climate Conditions**: These forests thrive in regions that experience high temperatures and high humidity. The temperature in tropical regions generally ranges around 28 degrees Celsius.

3. **Rainfall**: Tropical forests receive an annual rainfall of more than 200 centimeters, which contributes significantly to their density. This high level of precipitation creates a moist environment conducive to plant growth.

4. **Decomposition Process**: The combination of high temperatures and moisture facilitates the rapid decomposition of dead organic matter (plants and animals). This process enriches the soil with humus, which is essential for supporting a diverse range of plant life.

5. **Conclusion**: Given the conditions of high rainfall and high temperature, tropical forests are dense because these factors promote abundant plant growth and a rich ecosystem.

6. **Final Answer**: Therefore, the correct option is **D) high rainfall and high temperature**.