Biology B1.2-Plant Growth Hormones

How do plants respond to different stimuli?
by regulating their growth
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What is a tropism?
A plants growth response
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What is a positive tropism?
When a plant grows towards a stimulus
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What is phototropism?
the growth of a plant in response to light
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What is gravitropism or geotropism?
the growth of a plant in response to gravity
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What is Auxin
A plant hormone that controls growth at the tips of shoots and roots
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How does Auxin make the plant grow longer?
it is produced in the tips and diffuses backwards to stimulate the cells behind the tips to elongate
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What happens if the tip is removed?
No auxin is produced so the plant will stop growing
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What does high concentration of auxin create?
The inhibit of growth of the shoot
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How are shoots positively phototrophic?
When the tip is exposed to light more auxin accumulates on the side that is in the shade which makes the cells grow faster on the shaded side so it bends towards the light. This is to get the light for photosynthesis
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How are roots positivity geotropic?
When a root grows sideways gravity produces an unequal amount of auxin at the tip so it goes to the lower side. The extra auxin inhibits growth so the cells on the top grow and it bends downwards. This allows plants to extend theor roots in the soil
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What are roots positively geotropic?
This allows plants to extend their roots in the soil and absorb more minerals and water
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What does gibberelin do?
it stimulates seed germination, stem growth and flowering
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What do plants grow towards?
The light
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How can we use plant hormones as selective weedkillers?
most weeds have very broad leaves. The plant hormones disrupt the broad leaves weeds growth and kills them but not other plants.
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How do we use plant hormones to grow cuttings?
By adding rooting powder which will allow the roots to produce rapidly starting growth as a new plant
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How do we use plant hormones control the ripening of fruit?
A ripening hormone is added and the fruit will ripen whenever it us added whether it is on the journey to the supermarket or still on the plant,
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How do we use plant hormones to produce seedless fruit?
If the plant does not get pollinated by insects no seeds will grow. Hormones are added to the un-pollinated flowers of the plant so no seed will be produced.
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Other cards in this set

Card 2

Front

What is a tropism?

Back

A plants growth response

Card 3

Front

What is a positive tropism?

Back

Preview of the front of card 3

Card 4

Front

What is phototropism?

Back

Preview of the front of card 4

Card 5

Front

What is gravitropism or geotropism?

Back

Preview of the front of card 5
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