Slides in this set

Slide 1

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B3f: Controlling plant growth…read more

Slide 2

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B3f: Controlling plant growth
Page Ref: 23 Unit Sheet Box:
· Plant hormones are chemical messages called
auxins
· They travel around the plant in solution
(water)…read more

Slide 3

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Commercial use of hormones
Plant hormones are used in agriculture
(farming) to speed up or slow down plant
growth. Farmers and gardeners use plant
hormones as:
· Selective weedkillers ­ to kill weeds
· Rooting powders ­ causes roots to grow
· Keeping plants dormant
· Delaying the ripening of fruit
· Speed up or slow down plant growth…read more

Slide 4

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Tropism
· Tropism means directional growth caused by
auxins
Two types:
· Phototropism
· Geotropism…read more

Slide 5

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Plant growth
Phototropism:
Shoots will grow
towards the light
(against gravity)
Geotropism:
Roots will grow
towards moisture
(with gravity)
These responses are controlled by PLANT HORMONES…read more

Slide 6

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Phototropism
· Auxins in plant, causes shoots to grow
towards light
· Against the force of gravity…read more

Slide 7

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Slide 8

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Slide 9

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Slide 10

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lisa linsdell

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PP Presentation giving information on auxins and phototropism ect.

fernolivia

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JoHnNy McInAlLy

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tyler_chapman7

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