The following are the characteristics of a tropical rainforest:

• High annual rainfall (2000 mm)

• Daily temperature of about 28°C. It does not drop below 20°C or exceeds 35°C.

• Hot and humid atmosphere

• The climate is consistent with no seasons all year round.

• Nutrient-poor soil

• High levels of biodiversity 

For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• Environment & Ecology Trend Analysis: UPSC Strategy
• UPSC Environment and Ecology