Formation of tropical forests needs mean annual temperature and mean annual precipitation as

Options

A. 18 - `25^@C` and 150 - 400 cm
B. 5 - `15^@C` and 50 - 100 cm
C. 30 - `50^@C` and 100 - 150 cm
D. 5 - `15^@C` and 100 - 200 cm

Explanation

To solve the question regarding the formation of tropical forests and the required mean annual temperature and mean annual precipitation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Tropical Forests**:
- Tropical forests are characterized by their warm temperatures and high levels of precipitation. They are typically found near the equator.

2. **Mean Annual Temperature**:
- The mean annual temperature required for the formation of tropical forests is generally between 18°C to 25°C. This temperature range is essential for the growth of diverse plant species found in these forests.

3. **Mean Annual Precipitation**:
- The mean annual precipitation (or rainfall) necessary for tropical forests is quite high. It is usually above 140 cm per year, with a more common range being from 150 cm to 400 cm, and can even reach up to 1000 cm per year.

4. **Conclusion**:
- Therefore, for the formation of tropical forests, the mean annual temperature should be between 18°C to 25°C, and the mean annual precipitation should be above 140 cm, ideally in the range of 150 cm to 1000 cm.

### Final Answer:
- The formation of tropical forests needs a mean annual temperature of **18°C to 25°C** and mean annual precipitation of **above 140 cm**.