Plant Tropisms A plant’s response to a stimulus is called a tropism.

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Presentation transcript:

Plant Tropisms A plant’s response to a stimulus is called a tropism. 1. Phototropism 2. Gravitropism 3. Nastic response

The growth of a plant towards light is called phototropism The growth of a plant towards light is called phototropism. It maximizes light absorption for photosynthesis.

Plants don’t have muscles for movement so they have different cells grow at different rates. Ex) When the cells on one side grow more elongated than the cells on the other side, the stem curves.

To grow towards the light, cells on the side opposite of the light must be elongated.

Auxin: a chemical produced in plant tips that stimulates growth. To which side does active transport move the auxin to create the bend? The shaded side.

Gravitropism is a plant’s growth response to the force of gravity.

stems show negative tropism (against gravity) roots show positive tropism (down with gravity).

Nastic response: plant’s reaction to touch. Ex) Venus flytrap.

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