Respuesta :
1.) The weather of tropical rainforest is hot and wet; so that trees generally have a thin, smooth bark because they don’t need thick bark to prevent moisture like plants in temperate deciduous forests. The smoothness of the bark makes it difficult for other plants to grow on their surface. Some trees have different needs, like a pine tree's environment is about the same as a human's. It could not survive in a rainforest.
2.) During the time of sufficient water grasses in tropical savannas grow very quickly and when water becomes insufficient, they turn brown to minimize water loss. They store nutrients and moisture in their roots while waiting for rain. With food and water reserves stored below ground, the grasses are able to survive the effects of fire. This fire stimulates new growth and refills the soil with nutrients. Types of grass like the Creeping Bentgrass needs full sunlight and not much water to survive. If this grass were to come into contact with fire, it would burn quickly and wouldn't survive.
3.) Mangrove soils are regularly water-logged and loaded with salt. High tides bring marine aquatic and estuarine conditions, while low tides expose mud and roots to aridity, heat and desiccation. To cope with these conditions plants have special vertical roots, called pneumatophores. The pneumatophores form from lateral roots in the mud, often projecting above soil. These roots permit some oxygen to reach the oxygen-starved submerged roots and also can exhibit development of air cavities in root tissues, designs that aid oxygenation of the tissues. The density, size and number of pneumatophores vary per tree. They are green and contain chlorophyll for example e.g. Avicennia, Sonneratia. So, for a plant that lives in the desert, such as a cactus, does not need much water so it couldn't survive in conditions like this.
(sorry for the long answer, but hope it helps)
