Plants Responses to Environment

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State 5 reason why plants need to respond to environment
1. to cope with changing conditions 2. to avoid abiotic (non living) stress 3. to maximise photosynthesis (obtain more light/water/minerals) 4. to avoid grazing 5. to ensure germination/seed dispersal/pollination in suitable conditions
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What is tropism?
tropism is directional growth in which growth occurs in a certain direction according to direction of external stimuli
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State 6 types of tropism
1. chemotropism 2. geotropism 3. phototropism 4. thermotropism 5. hydrotropism 6. thigmotropism
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what is chemotropism?
directional response to chemicals
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what is geotropism?
directional response to gravity (roots grow towards pull of gravity. take up water, mineral and nitrate ions from soil)
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what is phototropsim?
directional response to light
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what is thermotropism?
directional response to temperature
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what is hydrotropism?
directional response to water
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what is thigmotropism?
directional response to touch plants grow around solid objects or other plants for suport)
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What are 'growth substances'?
plant hormones
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Card 2

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What is tropism?

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tropism is directional growth in which growth occurs in a certain direction according to direction of external stimuli

Card 3

Front

State 6 types of tropism

Back

Preview of the front of card 3

Card 4

Front

what is chemotropism?

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Preview of the front of card 4

Card 5

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what is geotropism?

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