Biology - Control in plants (tropisms) - B1.2.3

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  • Created by: shcoool
  • Created on: 16-05-15 16:38
What are plants sensitive to?
light, moisture and gravity
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Where do their shoots grow?
Shoots grow towards light and against the force of gravity
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Where do their roots grow?
Roots grow towards moisture and in the direction of the force of gravity
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How do plants control and coordinate growth?
They produce hormones
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Define a tropism
it is a plant growth in response to a stimulus
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What is the name given to a response to light and to gravity
phototropism, geotropism (geotropism)
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What is auxin?
A hormone that controls phototropism and geotropism by stimulating cell elongation ON A SHOOT and PREVENTING cell elongation ON A ROOT
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What causes the responses of plant roots and shoots to light, gravity and moisture?
They are a result of an unequal distribution of auxin
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Where is auxin produced and how does it control the growth response in shoots?
at the tips of shoots and roots, it diffuses in solution to parts of plant for cell elongation. Light destroys the auxin so other side that has auxin grows more and the shoot bends towards light.
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How does auxin control the response in roots?
Gravity makes the auxin sink to the bottom meaning the bottom does not grow as much which means it bends downwards.
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What can plant growth hormones be used for?
agriculture and horticulture as weed killers for unwelcome plants that compete with useful plants and as rooting hormones
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Other cards in this set

Card 2

Front

Where do their shoots grow?

Back

Shoots grow towards light and against the force of gravity

Card 3

Front

Where do their roots grow?

Back

Preview of the front of card 3

Card 4

Front

How do plants control and coordinate growth?

Back

Preview of the front of card 4

Card 5

Front

Define a tropism

Back

Preview of the front of card 5
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