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Adaptations of Plants to Rainforests

Geography: AQA GCSE, topic 2.2.3

How are Plants Adapted to Tropical Rainforests?

Plants have adapted to the tropical rainforest biome via evolution and natural selection. The adaptations have helped them to survive among the heavy precipitation and lack of sunlight on the rainforest floor.

Buttress roots

Buttress roots

  • Buttress roots are specially adapted tree roots that spread out across a very wide area and go deep underground.
  • Being spread so wide and deep allows buttress roots to absorb more nutrients.
  • However, they also spread out into the soil that other plants would use to absorb nutrients - so they compete with other plants for nutrients.
Waxy coating and pointed leaf tips

Waxy coating and pointed leaf tips

  • Many leaves in tropical rainforests have a waxy coating. This helps the plants to resist the rain. Without the waxy coating, the leaves could absorb the rain and become so heavy that they would be pulled off the tree.
  • The pointed leaf tips funnel the water off leaves in a single channel.
  • Both of these adaptations stop the heavy rainfall from damaging the plant.
A smooth layer of thin bark

A smooth layer of thin bark

  • Bark in the UK on trees like oak trees is very thick and rough.
  • Tree bark usually tries to conserve water, but if anything, plants in a rainforest need to ensure that they don't absorb too much water.
  • Having very smooth bark, like having a waxy coating on leaves, helps the rain to run off the tree easily.
Climbing vines

Climbing vines

  • Lianas and other climbing vines/plants try to compete for sunlight by growing up other trees' tree trunks. This conserves energy and allows them to reach the sunlight that they need to photosynthesise and survive.
Adapted to a particular layer

Adapted to a particular layer

  • There are 4 layers of flora in tropical rainforests. A plant living at each layer will adapt differently to survive:
  • The top layer is called the emergent layer and this layer captures the most sunlight. Being the tallest plant matters more here.
  • The lowest layer is called the forest floor. Plants are more likely to have a high surface area on their leaves to absorb the most sunlight here.

Test yourself on Adaptations of Plants to Rainforests

  • How are plants adapted to tropical rainforests?

  • What conditions do plants have to be adapted to in tropical rainforests?

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