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All main topics / Biology / Plants

Tropisms, Growth Regulators (6 Cards)

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1
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Define phenotypic plasticity.
A measure of the extent to which genetically identical organisms may differ due to environmental causes.
2
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Describe the mechanisms of plant response (3 things)
1. perception: detects a stimulus, activates a messenger molecule
2. Transduction: converts perception into action
3. Response: changes in phenotype (growth, physiology)

3
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Name 3 different types of tropism.
Phototropism = response to light
gravitroprism = response to gravity
thigmotropism = response to touch
autotropism = orientation of other organs
4
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Where is phototropism located?
Stem tips. Growth regulator auxin is transported down and away from light.
5
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Where is gravitropism located?
Root tips. Auxin produced in shoot, travels to root tip, redistributes, regulates cell elongation.
6
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List the 8 growth regulators.
Include major functions.
1. auxins
- phototropism
2. cytokinins
- overcome apical dominance
3. ethylene
- induce fruit ripening
4. abscisins
- proote stomatal closure
5. gibberrelins
- induce seed germination
6. brassinosteroids
- reduce stress
7. systemin
- signals wounding has occured
8. salicylic acid and jasmonic acid
- perceive/response to herbivores
Flashcard set info:
Author: zeestree
Main topic: Biology
Topic: Plants
Published: 04.05.2010
 
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