Tropisms

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A tropism is the growth of a plant in response to a such as light or gravity.
Tropisms improve a plant’s chances of and reproduction.
The tropism is described as positive if the growth is the stimulus and negative if away from the stimulus.
The two most important tropisms are and geotropism.
Phototropism is a plant's response to . It causes a plant's stem to grow up the light. This is an advantage to the plant because the leaves get more light resulting in greater production by photosynthesis.
Geotropism is a plant's response to . This causes the of a plant to grow downwards. This greatly improves anchorage and increases the absorption of water and .