In which forest type do all trees not shed leaves together even with high rainfall?

Correct answer: Tropical evergreen forest

Direct answer: Option A, tropical evergreen forest, is correct. Evergreen forests occur in areas with heavy rainfall and sufficient warmth. Their trees do not lose all their leaves during one particular dry season. Instead, different trees shed old leaves and grow new leaves at different times, so the forest remains green throughout the year. Option A works because this staggered leaf replacement is the defining idea in the question. Option B is wrong: dry deciduous forests shed most or all leaves together during a dry period to reduce water loss. Option C is wrong: thorn forests grow in low-rainfall, dry regions and have small leaves, thorns or spines. Option D is wrong: alpine vegetation occurs at high mountains above the tree line, where cold conditions prevent normal tall forests. Do not confuse ‘evergreen’ with one tree keeping the same leaves forever; it means the whole forest stays green because leaf replacement is continuous. Memory cue: heavy rain plus year-round green means tropical evergreen forest.