Grow in the correct direction of the resource needed.
Photo tropism = grow towards or away form light. Geo tropism = grow up or down in response to the gravity field.
Plant geotropism (or, more properly gravitropism) is the growth of a plant in response to gravity. Yes, it's just that simple, though different aspects of plant growth may not indicate this. You...
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Chloroplasts allow plants to produce carbohydrates through photosynthesis.