Plant Responses to Stimuli Flashcards

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In biology, what is a stimulus?

A stimulus is any change in the environment that can cause a living thing to respond.

It is how a plant changes its growth or behaviour when something in its environment changes.

Plants can detect light and gravity. They can also detect things like water and touch.

Plants need light for photosynthesis, so they respond by growing towards light to make more food.

Gravity helps roots grow down into the soil and shoots grow upwards, which helps support the plant and find light and water.

Plant responses are slower and usually involve growth and plant hormones, not fast movement using a nervous system.

A tropism is a growth response in which a plant grows towards or away from a stimulus.

In a positive tropism the plant grows towards the stimulus. In a negative tropism it grows away from the stimulus.

Phototropism is a plant’s growth response to light, such as a shoot growing towards a light source.

Gravitropism is a plant’s growth response to gravity, such as roots growing downwards in the direction of gravity.