Plant Hormones

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What are the two types of plant hormones?
Auxins and gibberellins
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List the ways that humans use plant hormones.
Selective weed killers, rooting powders
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How do selective weed killers work?
Selective weed killers contain growth hormone that cause the weeds to grow too quickly and then die. The weed killer is absorbed in larger quantities by the weeds than the beneficial plants, which stay healthy.
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How is rooting poweder used?
Rooting powder contains growth hormones to make stem cuttings quickly develop roots.
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How do cells in shoots react to high concentrations of auxins?
They grow more
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How do cells in roots react to high concentrations of auxins?
They grow less
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Why do plants bend towards the light?
(Phototropisms) In a shoot, the shaded side contains more auxin. This means that the shaded side grows longer, causing the shoot to bend towards the light.
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Gravitropisms
Auxins are also involved in gravitropisms. In a root placed horizontally, the bottom side contains more auxin than the top side. This makes the bottom side grow less than the top side, causing the root to bend in the direction of the force of gravity
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Card 2

Front

List the ways that humans use plant hormones.

Back

Selective weed killers, rooting powders

Card 3

Front

How do selective weed killers work?

Back

Preview of the front of card 3

Card 4

Front

How is rooting poweder used?

Back

Preview of the front of card 4

Card 5

Front

How do cells in shoots react to high concentrations of auxins?

Back

Preview of the front of card 5
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