Tropisms in plants

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Phototropism
A plants growth response to light
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Geotropism
A plants growth response to gravity
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Why are a plants tropisms important from the beginning?
Because when a seed is in the ground it needs to use its tropisms to make sure the shoot grows above ground and the roots grow into the ground
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What type of plants are easiest to use when investigating tropisms and why?
Monocot seeds/ plants because they usually have a shoot that emerges as a single spike making them a lot easier to manipulate
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What is unilateral light?
Light that only shines from one side
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What happens to the auxin in the shoot in response to unilateral light?
The auxin moves into the area of the shoot with less light, there is a greater concentration of auxin on the unilluminated side so it stimulates this side to grown bending it towards the light, once light isnt unilateral anymore, auxin is equal
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Why do plants grow straight upwards in normal lighting?
Because the auxin is equally distributed around the shoot so it just grows up towards the light
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What happens to a plant when it is grown in the dark?
It grows rapidly so it can reach light to photosynthesise
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What plant hormone has evidence suggested is involved in this growth spurt in the dark?
Gibberellins- cause extreme growth in the internodes in order to have the most growth and reach light
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What type of geotropic are the shoots and the roots?
Shoots- negatively geotropic, roots- positively geotropic
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Other cards in this set

Card 2

Front

Geotropism

Back

A plants growth response to gravity

Card 3

Front

Why are a plants tropisms important from the beginning?

Back

Preview of the front of card 3

Card 4

Front

What type of plants are easiest to use when investigating tropisms and why?

Back

Preview of the front of card 4

Card 5

Front

What is unilateral light?

Back

Preview of the front of card 5
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