B1 Controlling plant growth

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Phototropism is...
A plant's growth response to light
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Geotropism is...
A plant's growth response to gravity
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Which part of a plant is negatively phototropic and positively geotropic and what does it mean?
Roots are negatively phototropic so they grow away from light and positively geotropic so they grow with the pull of gravity
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Which part of a plant is positively phototropic and negatively geotropic and what does it mean?
Shoots are positively phototropic so they grow towards the light and negatively geotropic so they grow away from the pull of gravity
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What is involved in phototropism and geotropism?
Auxins
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What are auxins?
A group of plant hormones
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Where are auxins made?
In the tips of the roots and shoots
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Why do shoots curve towards the light?
There are more auxins in the shady parts of the shoots and the length of cells increase with a higher amount of auxin so the increase in cell length of the shady side of shoots makes it curve towards the light
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Name a commercial use of plant hormones...
Selective weedkillers (kill specific weeds & increase crop yield)
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Name a commercial use of plant hormones...
Rooting powder (increase root growth of cuttings)
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Name a commercial use of plant hormones...
To delay or accurate fruit ripening (in order to meet market demands)
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Name a commercial use of plant hormones...
To control dormancy in seeds
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Other cards in this set

Card 2

Front

A plant's growth response to gravity

Back

Geotropism is...

Card 3

Front

Roots are negatively phototropic so they grow away from light and positively geotropic so they grow with the pull of gravity

Back

Preview of the back of card 3

Card 4

Front

Shoots are positively phototropic so they grow towards the light and negatively geotropic so they grow away from the pull of gravity

Back

Preview of the back of card 4

Card 5

Front

Auxins

Back

Preview of the back of card 5
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