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Description
Flashcards by s.ghillean, updated more than 1 year ago
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Created by s.ghillean
almost 12 years ago
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| Question | Answer |
| A tropism | A 'tropism' is a growth in response to a stimulus. Plants grow towards sources of water and light, which they need to survive and grow. |
| Different types of tropisms | Tropism – growth in response to a stimulus Positive tropism – towards the stimulus Negative tropism – away from the stimulus Phototropism – growth in response to the direction of light Geotropism – growth in response to the direction of gravity |
| positive tropism | -Stem tip -Growth towards light -To get maximum light for photosynthesis |
| negative phototropism | -Root tip -Growth away from light -Less chance of drying out |
| positive geotropism | -Root tip -Towards gravity -More chance of finding moisture |
| negative geotropism | -Stem tip -Away from gravity -More chance of finding light |
| auxin | Auxin is a plant hormone responsible for controlling the direction of growth of root tips and stem tips in response to different stimuli including light and gravity. |
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