Response to Stimuli: Plants
- Plants need to be able to grow in response to certain stimuli
- For example, plants need to be able to grow in response to light, to ensure their leaves can absorb light for photosynthesis
- They also need to be able to grow in response to gravity, to ensure that shoots grow upwards and roots grow downwards
- The directional growth responses made by plants in response to light and gravity are known as tropisms
- If the growth is towards the stimulus, the tropism is positive and if the growth is away from the stimulus, the tropism is negative
