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Biology
Paper 2
Plant hormones
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Cards (54)
What do plants produce that regulate growth and development?
Chemicals called
hormones
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What is the role of auxins in plants?
They control
growth
at the tips of
shoots
and
roots
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How do auxins move through the plant?
They move through the plant in
solution
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Where are auxins produced in the plant?
In the tips of
shoots
and
roots
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What process do auxins stimulate in cells?
Cell elongation
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How do auxins affect plant responses to light?
They promote
growth towards
light
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What happens when a shoot tip is exposed to light?
It accumulates more
auxins
on the shaded side
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How does the distribution of auxins affect shoot growth?
It causes
bending
towards the light source
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What is the effect of auxins on root growth?
They promote growth
downwards
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How do auxins respond to gravity?
They promote
downward
growth of roots
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What happens to auxin distribution when a root grows sideways?
More
auxins
accumulate on the lower side
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How does gravity affect the growth direction of roots?
Roots bend downwards due to
auxin
distribution
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What type of phototropism do shoots exhibit?
Positive
phototropism
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What happens when a shoot tip is exposed to light?
It accumulates
auxins
on the shaded side
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How does bending towards light affect a shoot's growth?
It allows for more
light absorption
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What is the effect of auxins on shoot growth in shaded areas?
They
promote
faster growth
in
shaded
areas
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What type of gravitropism do roots exhibit?
Positive
gravitropism
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How do roots respond to gravity?
They
grow downwards
towards
gravity
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How does the growth of roots differ from shoots in response to gravity?
Roots grow
towards
gravity, shoots grow
away
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What is the effect of auxins on root growth?
They promote
downward
growth
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How do auxins affect the growth direction of roots?
They promote growth towards
gravity
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What happens to the growth of roots when they are exposed to uneven gravity?
They
grow
faster
on the
lower side
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How does the growth of roots differ from shoots in response to light?
Roots grow
away
from light, shoots grow
towards
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What is the effect of auxins on shoot growth in the dark?
They promote
elongation
quickly
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How do auxins affect the growth of shoots in the dark?
They promote rapid
elongation
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What happens to shoots growing in complete darkness?
They elongate quickly and bend towards
light
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How
does the growth of shoots in the dark compare to those in light?
They grow faster in the dark
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What is the effect of auxins on the growth of shoots in light?
They
promote growth
towards
the
light
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How do auxins influence the direction of shoot growth?
They cause shoots to bend towards
light
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What happens to auxin levels when a shoot is exposed to light?
They accumulate more on the
shaded
side
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How does the bending of shoots towards light affect their growth?
It
enhances
their
ability
to
absorb
light
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What is the effect of auxins on the growth of shoots in the dark?
They promote rapid
elongation
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How do auxins affect the growth of roots in the dark?
They promote
downward
growth
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What happens to roots growing in complete darkness?
They
grow downwards quickly
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How does the growth of roots in the dark compare to those in light?
They grow faster in the
dark
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What is the effect of auxins on the growth of roots in light?
They promote
downward
growth
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How do auxins influence the direction of root growth?
They cause roots to grow
downwards
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What happens to auxin levels when a root is exposed to light?
They accumulate more on the
shaded
side
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How does the bending of roots towards gravity affect their growth?
It enhances their ability to
anchor
in soil
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What is the effect of auxins on the growth of roots in the dark?
They promote
downward
growth
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