Control in plants

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What are plant responses called and what do they do?
tropisms which ensure that any growth is towards sources of light and water,
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What is a tropism where light is gthe stimuli?
phototropism
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What is a tropism where gravity is gthe stimuli?
Geotropism
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In a shoot, what happens if light is the stimuli?
Positive phototropism-Grows towards the light
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In a root, what happens if light is the stimuli?
Negative phototropism- Grows away from the light
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In a shoot, what happens if gravity is the stimuli?
Negative geotropism-Grows against the force of gravity
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In a roots, what happens if gravity is the stimuli?
Positive geotropism-Grows in the direction of the force of gravity
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What are auxins and where in the plant are they found?
A family of hormones found in plants on the tips of shoots and roots,
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In high concentrations of auxins, what do cells in shoots do?
Grow more
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In high concentrations of auxins, what do roots do?
Grow less
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What shade of the shoot contains more auxins and why?
The shaded side as it causes the shaded side to grow longer to bend towards the light
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What shade of the roots contain more auxins and why?
The shaded side contains less auxins so this side grows less so it grows away from the light,
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Tissue culture is a type of asexual reproduction. Describe reproduction. (3marks)
-Doesnt involve fertilisation of the fusion of gametes, -No genetic material is mixed, -Involves one parent only, -Produces a clone with no variation,
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What is one advantage of using tissue culture and not using cuttings to produce plants?
-It produces more offspring from one plant, -Less damage to plant,
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Card 2

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What is a tropism where light is gthe stimuli?

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phototropism

Card 3

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What is a tropism where gravity is gthe stimuli?

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Card 4

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In a shoot, what happens if light is the stimuli?

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Card 5

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In a root, what happens if light is the stimuli?

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