In the tropics, insect-pollinated plants predominate, while wind-pollinated species are relatively rare. Why are there few wind-pollinated plants in tropical forests?
1) In the tropics, many plants are evergreen. Foliage prevents pollination of plants by the wind (makes pollen transfer difficult by wind).
Because the rainforests are very dense, there is virtually no wind.
2) The abundance of plants per unit area in the tropics (or, because the rainforests are very dense) also prevents pollen transfer
3) There are a lot of insects in the tropics that pollinate the pollinated plants.
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