Biology homeostasis - plant hormones

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10 Terms

1
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Positive gravitropism

Growth towards gravity

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Positive Phototropism

Growth towards light

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Where is auxin produced?

Root and shoot tips.

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What effect does auxin have in the shoots?

Promotes cell elongation creating growth.

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What effect does auxin have in the roots?

Auxin inhibits cell elongation decreasing growth.

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Which way do auxins diffuse in the presence of light?

Away from the light - towards the shaded side.

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Which device negates the effect of gravity?

A clinostat

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Uses of auxins

Selective weedkillers, promoting growth in tissue culture and as rooting powders.

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Uses of ethene

Controlling the ripening of fruit during storage and transport.

Ethene speeds up ripening, so taking it away slows down ripening.

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Uses of gibberellins

Promote flowering

Increase fruit size

Promote seed germination (ending seed dormancy)