Phototropism and Geotropism

Phototropism and geotropism are two different types of plant responses to external stimuli, involving the growth and orientation of plant parts. These responses help plants optimize their growth and survival by positioning themselves in relation to light and gravity.

1. Phototropism: Phototropism is the movement or growth of a plant in response to light. Plants exhibit positive phototropism when they grow towards a source of light and negative phototropism when they grow away from it. The primary mechanism behind phototropism is the _______ _______ _________ _____ ______ _________ ________ _______ _______ __________.
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