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biology paper 2
topic 5 - homeostasis
plant hormones
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Cards (13)
What should you be able to describe by the end of the video?
How plants use
hormones
to respond to
light
and
gravity
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What is phototropism?
Growth of plant
shoots
towards light
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What hormone is suggested to control phototropism?
Auxin
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What happened when scientists removed the tips of the shoots?
The shoots did not go towards the
light
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What does covering the tips of the shoots with foil indicate?
Tips are sensitive to
light
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What was the result when the lower parts of the shoots were covered with foil?
The shoots grew towards the
light
as normal
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How do shoots use auxin to grow towards light?
Auxin produced at the tip of the shoot
Auxin triggers
cell growth
Light causes auxin to concentrate on the darker side
Cells on the darker side grow faster
Shoots bend towards the light
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What is gravitropism also known as?
Geotropism
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How does gravity affect auxin in roots?
Gravity causes auxin to concentrate on the
lower
side
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What is the effect of auxin on root cell growth?
Auxin
inhibits
cell growth in roots
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What are the roles of gibberellins and ethylene in plants?
Gibberellins
: Start
germination
of seeds
Ethylene: Controls
cell division
and fruit ripening
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What type of students need to know about gibberellins and ethylene?
Higher-tier
students
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Where can students find more questions on plant hormones?
In the
vision workbook
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