Biology B1 2.6 Hormones and the control of plant growth.

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What do plants respond to?
Light, moisture and gravity.
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In which direction do shoots grow?
Towards light and away from gravity.
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In which direction do roots grow?
Towards gravity and water.
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What do plant hormones have uses in?
Agriculture and horticulture. They can be used as weed killers and to stimulate root growth.
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What are plants sensitive to?
Light, gravity and moisture.
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Plant shoots grow towards light, what is this response called?
Phototropism.
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Roots grow down toward gravity, what is this response called?
Gravitropism.
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What is the hormone that controls phototropism and gravitropism?
Auxin.
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What causes unequal growth in plants?
Unequal distribution of auxin.
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What does unequal growth in plants result in?
Bending of the shoot or root.
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What light, gravity and water in relation to plants?
Stimuli which cause the shoot and roots to respond, this response is controlled by the plant hormone auxin.
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Why do shoots bend towards light?
Unequal distribution of auxin causes unequal growth of the shoot.
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A normal young bean plant is laid on its side in soil, why does the root grow down?
More auxin gathers on the lower side of the root in response to the stimuli gravity (gravitropism) and water.
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A normal young bean plant is laid on its side in soil, why does the shoot bend upwards?
More auxin gather on the upper side of the shoot in response to the stimuli light (phototropism).
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Card 2

Front

In which direction do shoots grow?

Back

Towards light and away from gravity.

Card 3

Front

In which direction do roots grow?

Back

Preview of the front of card 3

Card 4

Front

What do plant hormones have uses in?

Back

Preview of the front of card 4

Card 5

Front

What are plants sensitive to?

Back

Preview of the front of card 5
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