Types of Tropisms
Biology: Edexcel IGCSE, topic 3.5.4
Tropisms
Tropisms are controlled by auxins. They are groups of responses that can be split into:
Phototropisms
- These involve growth either towards (positively phototropic) or away from (negatively phototropic) a light source.
Gravitotropisms (or geotropisms)
- Growth either towards (positively gravitropic) or away from (negatively geotropic) the direction of gravity.
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What is a negative gravitropism?