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Biology
plant hormones 1
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Created by
Yasmin Younis
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Cards (25)
What environmental stimuli do plants respond to in order to survive?
Light,
gravity
, and touch
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How do plants respond to stimuli compared to animals?
Plants respond much more
slowly
than animals
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Why do plants grow their shoots towards the light?
To maximize
photosynthesis
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Why do plants grow their roots downwards?
To fix themselves and find
water/minerals
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What do plants rely on entirely to respond to their environment?
Hormones
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Do plant hormones act locally or throughout the entire organism?
Locally
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Which plant hormones control growth at the ends of shoots and roots?
Auxins
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After production in the tips, how do auxins move along the shoot or root?
They dissolve and
diffuse
backwards
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What effect do auxins have on shoots?
Stimulate
growth
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What effect do auxins have on roots?
Inhibit
growth
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What is the name for a plant's response to light?
Phototropism
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What is the name for a plant's response to gravity?
Geotropism
or
gravitropism
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Where do auxins accumulate in relation to light?
On the
shaded
side
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Where do auxins accumulate in relation to gravity?
On the
lower side
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Are shoots positively or negatively phototropic?
Positively phototropic
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Are
shoots
positively
or
negatively
geotropic
?
Negatively geotropic
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Why does a shoot curve towards the light when auxin accumulates on the shaded side?
Shaded side
cells
grow
faster
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How does gravity affect auxin distribution in a shoot lying horizontally?
Auxin collects on the
lower
side
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Why does a shoot curve upwards when auxin accumulates on its lower side due to gravity?
Lower side
cells
grow faster
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Are roots positively or negatively phototropic?
Negatively phototropic
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Are roots positively or negatively gravitropic?
Positively
gravitropic
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What happens when roots are exposed to light?
Auxins
accumulate on the shaded side
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Why does a root curve downwards when auxins accumulate on its lower shaded side?
Upper
side grows faster
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If a root is horizontal, how does gravity affect its growth?
Upper
side grows faster
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Why does the upper side of a horizontal root grow faster due to gravity?
Auxins
inhibit growth on lower side
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