The growth response of a plant to certain environmental stimuli.
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What is phototropism?
Phototropism is where auxin builds up on the shaded side of the plant, causing the cells on that side to elongate. Therefore the plant bends towards the light.
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Explain why phototropism occurs.
Auxin builds up on the shaded side of the plant, they then bend so they can maximise the amount of light leaves absorb from photosynthesis.
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What is geotropism?
Geotropism is where auxin builds up on the lower side of the plant, which causes the cells to elongate less on the lower side and more on the upper side.
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Explain why geotropism occurs.
Auxin builds up on the lower side, resulting in the upper side elongating, to ensure the roots obtain the maximum amount of water and nutrients.
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Which way do shoots and roots grow as a result of phototropism?
Shoots will grow towards the light and roots will show no response but can occasionally grow away from the sunlight.
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Which way do shoots and roots grow as a result of geotropism?
Shoots will grow away from gravity and roots will grow towards gravity.
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Other cards in this set
Card 2
Front
What is phototropism?
Back
Phototropism is where auxin builds up on the shaded side of the plant, causing the cells on that side to elongate. Therefore the plant bends towards the light.
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