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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.
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