How Do Plants Respond to Light and Gravity?

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Phototropism is a plant's response to light.

A stimulus is anything that causes an organism to respond.

Gravitropism is an adaptation that causes some plants to live longer than others.

Gravitropism is an adaptation that makes sure a plant's roots grow down, and its stem grows up.

Gravitropism will cause the roots to respond to the pull of gravity and grow toward the soil.

A plant's response to a stimulus is called a tropism.

Some plants have parts that can move in response to being touched.

A plant bends toward the light because the cells on the side of the plant facing the light are shorter.