The biological processes that occur which could be responsible for rain in rainforests are transpiration and evaporation.
Rainforest is characterized by thick vegetation of different sizes. The plants in rainforest habitat are usually of broad leaves including trees with huge canopies.
Broad leaf area of the plants in the rainforest encourages increased transpiration and evaporation of moisture into the atmosphere.
During transpiration, water moves out of plants through stomata. This water then evaporates into the atmosphere to form clouds.
The water in form of clouds become dense and later result into precipitation.
This implies that, the more vegetation cover that exists in an habitat, the more rainfall such areas will have. The thick vegetation cover in the rainforest promotes increased rate of transpiration and evaporation of moisture which results to rainfall.
Therefore, the processes that occur in the rainforest which is responsible for rainfall are transpiration and evaporation.
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