B1 Controlling Plant Growth

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Plant hormones are chemicals that control what?
1. the growth of shoots and roots 2. flowering and the ripening of fruits
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What are auxins?
one group of plant hormones that move through the plant in solution
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How do auxins affect the plant's growth?
by responding to gravity (geotropism) and light (phototropism)
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How do shots grow?
towards the light (positive phototropism) against gravity (negative geotropism)
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How do roots grow?
away from light (negative phototropism), downwards in the direction of gravity (positive geotropism) to absorb water and provide support for the plant
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Where is auxin made?
in the shoot tip
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What is an auxin's distribution determined by?
light and can therefore be unequal
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What happens when the light shines on a shoot?
1. the hormones in direct sunlight are destroyed 2. the hormones on the shaded side continue to function causing the cells to elongate 3. the shoot bends towards the light
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What are plant hormones used to do in agriculture?
to speed up or slow down plant growth
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What is rooting powder?
a hormone which encourages the growth of roots in stem cuttings, so many plants can be obtained from one plant
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What is fruit-ripening hormone?
causing fruit to either ripen quicker or slower
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What is control of dormancy?
hormones can be used to speed up or slow down plant growth and bud development
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What is selective weed killer?
hormones in the weedkiller disrupt the growth patterns of their target plants.
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Other cards in this set

Card 2

Front

What are auxins?

Back

one group of plant hormones that move through the plant in solution

Card 3

Front

How do auxins affect the plant's growth?

Back

Preview of the front of card 3

Card 4

Front

How do shots grow?

Back

Preview of the front of card 4

Card 5

Front

How do roots grow?

Back

Preview of the front of card 5
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