CHAPTER 14 NOTES

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What can plants respond to?
Plants can respond to gravity, light and temperature.
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How do plants control their responses?
Responses are controlled by hormones.
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What is a hormone?
A hormone is a chemical messenger that is transported to cell that are capable of responding.
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What is phototropism?
Phototropism is growth in response to light
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What is Geotropism?
Geotropism is growth in response to gravity.
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What is apical dominance?
Apical dominance is inhibition of lateral branches.
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What is fruit ripening?
Fruit ripening is conversion of starches to sugars.
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What is abcission?
Abcission is shedding of leaves and flowers
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Where is auxin produced?
Auxin is produced in the meristem and diffuses through layers of cells.
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What do gibberellins do?
Promote growth in an entire plant
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What do cytokinins do?
Promote cell division and differentiation in the presence of auxin.
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What is Abscisic Acid?
Abscisic Acid is an inhibitory hormone produced in chloroplasts.
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What are physical stimuli that plants respond to?
Day/night length, gravity, temperature and touch.
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What are chemical stimuli that plants respond to?
Water and carbon dioxide
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How do leaves track the sun as it moves?
Leaves track the sun by changing turgor.
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Are plant hormones slower acting than animal?
Yes, plants hormones are slower acting than animal.
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What is phototropism a response to?
Phototropism is a response to blue light.
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What is thigmotropism? Give an example?
Growth in response to contact with a surface. Climbing plants like peas.
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What is vernalisation?
Vernalisation is the period of winter cold that stimulates flowering.
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How do plants control their responses?

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Responses are controlled by hormones.

Card 3

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What is a hormone?

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Card 4

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What is phototropism?

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Card 5

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What is Geotropism?

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