Plant Hormones Flashcards

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1
Q

Auxin

A

Plant hormone which controls growth near tips of shoots and roots

Responds to phototropism, gravitropism and geotropism

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2
Q

Why do shoots grow towards light?

A

More auxin accumulates on side in shade

Makes cells elongate faster on shaded side

So shoot bends towards light

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3
Q

Why do shoots grow away from gravity?

A

Gravity produces unequal distribution of auxin in tip with more on lower side

Lower side grows faster

So shoot bends upwards

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4
Q

Why do roots grow towards gravity?

A

Root growing sideways with have more auxin on lower side

But on a root, extra auxin inhibits growth

Cells on top elongate faster

So root bends downwards

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5
Q

What method to investigate plant growth responses?

A

Using cress seeds under lamp

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6
Q

Control variables of this experiment

A

Same number of seeds in each dish

Use seeds that have all come from same packet

Stable temperature

Same amount of water

Same light intensity

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7
Q

Use of auxins commercially

A

Killing weeds

Growing from cuttings with rooting powder

Growing cells in tissue culture

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8
Q

Gibberellin

A

Stimulates plant stems to grow

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9
Q

Commercial uses of gibberellins

A

Controlling dormancy

Inducing flowering

Growing larger fruit

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10
Q

Ethene

A

Stimulates ripening of fruits

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11
Q

Commercial uses of ethene

A

Speed up ripening of fruit

Fruit can be picked whilst unripe and transported with ethene gas

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