term1 Definition1term2 Definition2term3 Definition3
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Tropism
°directional growth in response to an internal and/or external stimulus
°Positive: toward stimulus
°Negative:away from stimulus
Phototropism
♢Undirectional light
♢"acid growth" hypothesis
♢migration of Auxin to shaded side of stem
Gravitropism
◆In roots:
-are positive
-Root cap must be present
>Amyloplast
>interaction with calcium and IAA
◆Stems:
-Are negative
-Elongation on lower side to turn stem up
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