list three ways in which tropical plants have adapted to wet habitats?

Answer 1

Most first adapt by their root systems. They become more fibrous and increase their branching roots for support.
The roots also tend to be around the soil surface also. Some have little or no roots and use the water for support instead of the soil.
The plants also become more pithy and less woody. More bully form cells form and stomates to take in nutrients with the water. This allows the ability to remove nutrients directly from the water and not so much from the soil.
These plants also form larger leaves as to compete for sunlight at the surface. This is what you see as water Lillie's and wort's. Some produce many leaves instead of larger ones to compete also, as in Duck Salad. They can form carpets on top of the water and this starving the water of oxygen and in worst cases fish can die.

Answer 2

1. Leaves are shaped with drip tips to shed excess water and not have to bear the weight.
2. Leaves are more likely to be shiny and not fuzzy or hairy, again to shed excess water.
3. Bromeliads collect the rainwater to use the water supply, but also to trap leaves and other matter which decomposes and gives the plant nutrients.