Controlling Plant Growth

Includes information on: Plant responses, plant hormones (auxins) and the commercial use or plant hormones.

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What is photropism?
Phototropism is a plant's growth response to light.
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What is geotropism?
Geotropism is a plant's growth in response to gravity.
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How do the shoots of a plant respond?
The shoots of a plant are positively phototropic (they grow towards light) and negatively geotropic(they pull away from gravity).
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How do the roots of a plant respond?
The roots of a plant are negatively phototropic (they grow away from light) and positively geotrpic (they grow with the pull of gravity).
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What are auxins?
A group of plant hormones.
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Where are auxins made?
Auxins are made in the roots and shoot tips.
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How do auxins cause phototropism?
Auxin elongates plant cells and is destroyed by light, so shaded parts of the shoot will be longer than parts of the shoot in the light. This causes the shoot to bend towards the light source.
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How can plant hormones be used commercially?
They can be used as selective weed killers and rooting powders as well as accelerating fruit ripening and controlling seed dormancy.
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Other cards in this set

Card 2

Front

What is geotropism?

Back

Geotropism is a plant's growth in response to gravity.

Card 3

Front

How do the shoots of a plant respond?

Back

Preview of the front of card 3

Card 4

Front

How do the roots of a plant respond?

Back

Preview of the front of card 4

Card 5

Front

What are auxins?

Back

Preview of the front of card 5
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