3. Responses in Plants
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9 Terms
Phototropism
the growth of a plant in response to light
Gravitropism
the growth of a plant in response to gravity
auxins
hormone-like chemical that speeds up or slows down plant growth.
where are auxins produced?
in the tips of shoots
how and where do auxins move
Growth factors called auxins are produced in the tips of shoots and diffuse to the shady part of the shoot to stimulate the cell just behind the tips to elongate.
IAA
Indoleacetic acid
where is IAA produced?
shoots and roots
How does IAA move?
diffusion and active transport.
Where does IAA move in the shoot and the roots and what is the effect?
shoots: moves to the shaded parts, elongating the shoot and bending it towards the light.
roots: moves to the shaded parts, inhibiting the growth of the root, making it bend away from the light.
Note 
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