Tropisms and Turgor Pressure

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Presentation transcript:

Tropisms and Turgor Pressure TEKS 7.7C

Tropism - The response of plants to external stimuli

Phototropism - The tendency of a plant to grow towards light

Geotropism (Gravitropism) - The tendency of a plant to grow in a direction in response to gravity (roots-down)

Geo and Phototropism

Thigmotropism - Response of plants to touch such as in vines and climbing plants on trees

Thigmotropism in a Venus Fly Trap

Turgor Pressure Water pressure in a cell that pushes against the cell membrane and cell wall. It makes plants cells firm and rigid. Loss of it is referred to as wilting.

Cool Turgor Pressure Video