The document discusses the key features of tropical rainforests. It notes that tall trees can reach heights of 40-50 meters to receive more sunlight. The interior of rainforests remain cool and moist as they receive 70-100% sunlight. Common plants in tropical rainforests include lianas, epiphytes, and dense undergrowth layers that receive less sunlight. Examples of tropical rainforests discussed include the Bukit Timah Nature Reserve in Singapore. The document also outlines some benefits that tropical rainforests provide, such as producing oxygen, sourcing medical drugs, preventing soil erosion, and offering recreational activities.