Plant responses: investigating tropisms

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  • Created by: Esme.B
  • Created on: 01-11-17 14:11
Definition of Geotropism
A directional growth response to gravity
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Definition of phototropism
A directional growth response to light
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List the 5 types of meristem which provoke the growth of the plant.
1. Apical meristems 2. lateral meristems 3.root tips 4. shoot tips 5.Intercalary meristem
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Give an example of an experiment which investigates the phototropic responses?
1. control plant=illuminated from all sides. 2. experimental plant=illuminated from just one side. Results demonstrate- shoot bend towards light because the shady side of the shoot elongated more than illuminated side/
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What's the main result displayed by the experiment of the plants being illuminated?
Mean + standard deviation of the lengths between the marks has increased on the shady side.
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Give an example of an experiment which investigates the geotropic responses?
1. control plant= constantly spun by a Klinostat(ensure gravity is applied equally on all sides) -root+shoot grow horizontally. 2. experimental plant=root bends downwards+shoot bend upwards due to lower side of shoot elongated more than the upper sid
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What did Darwin's experiment confirm?
Shoot tip= responsible for phototropic responses.
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What did Boysen-Jensen's work confirm?
1. water/or solutes need to be able to move backwards from shoot tip for phototropism to happen. 2. Permeable gelatine inserted behind shoot tip=positive phototropism.3. Impermeable mica block inserted =no phototropic response.
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What effect does agar have on auxin?
1. agar blocks impregnated with different Conc of auxin=same results 2. using a series of different Conc of auxin(created by serial dilution)= gives shoot curvature in proportion to amount of auxin.
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where's auxins produced?
Apex of the shoot
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Card 2

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Definition of phototropism

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A directional growth response to light

Card 3

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List the 5 types of meristem which provoke the growth of the plant.

Back

Preview of the front of card 3

Card 4

Front

Give an example of an experiment which investigates the phototropic responses?

Back

Preview of the front of card 4

Card 5

Front

What's the main result displayed by the experiment of the plants being illuminated?

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