B1 Plant Hormones

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what is auxin
a plant hormone that controls growth near the tips of shoots and roots
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what is geotropism
growth of a plant in response to gravity
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what is gravitropism
growth of a plant in response to gravity
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what is hydrotropism
growth of a plant in response to moisture
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2 ways auxin is used in agriculture
made into selective weedkillers, made into rooting powder to make plant cuttings grow
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what happens when a shoot tip is exposed to light
more auxin accumulates on the side that in the shade
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why does this happen
makes the cells elongate faster on the shaded side so the shoot bends towards the light
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what happens when a shoot is growing sideways
gravity produces an unequal distribution of auxin in the tip with more auxin on the lower side
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why does this happen
causes the lower side to grow faster, bending the shoot upwards
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what happens when a root is growing sideways
more auxin on the lower side
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what does extra auxin in a root do
inhibits growth so the root bends downwards
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what happens with auxin when there is uneven amount of moisture on either side of the root
more auxin is produced on the side with more moisture
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what does this do
inhibits growth on that side causing the root to bend towards the moisture
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Card 2

Front

what is geotropism

Back

growth of a plant in response to gravity

Card 3

Front

what is gravitropism

Back

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Card 4

Front

what is hydrotropism

Back

Preview of the front of card 4

Card 5

Front

2 ways auxin is used in agriculture

Back

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