Question

why is Tropical rainforest also called evergreen forest

Answer 1

As tropical rain forest never shed their leaves and in tropical rain forest rainfall happens more than 200 cm

Answer 2

 Tropical rainforests or evergreen forests are found in areas receiving heavy rainfall. They are very dense.
 The tropical rainforests are also called evergreen forests as they remain green throughout the year. This is because they shed their leaves at different times of the year.