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Biology: Module 5 - Plant Responses > Summary of plant Hormones > Flashcards

Summary of plant Hormones Flashcards

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1
Q

what are an example of auxins?

A
  • IAA
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2
Q

Give an example of gibrellins ?

A
  • Gibbrellic acid
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3
Q

where are auxins made?

A
  • root tips
  • shoot tips
  • young leaves
  • growing parts of the plants
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4
Q

where are gibrellins made?

A
  • seeds
  • young leaves
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5
Q

where is ethene made?

A
  • old leaves
  • ripening fruit
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6
Q

give an example of absiisic acids?

A
  • ABA
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7
Q

what causes growth of auxins?

A
  • growth in shoots by cell division
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8
Q

what promotes gibrellins?

A
  • seed germination
  • flowering
  • stem elongation
  • lateral shoot growth
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9
Q

what promotes ethene?

A
  • leaf loss/drop
  • fruit ripening
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10
Q

what promotes Abscissic acid?

A
  • closing stomata
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11
Q

what inhibits auxins?

A
  • growth in root tips
  • leaf loss
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12
Q

what inhibits abscissic aicd?

A
  • gibrellins (seed germination)
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13
Q

what is the commercial use of auxins?

A
  • rooting powders
  • weed killers
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14
Q

what is the commercial use of gibrellins?

A
  • seedless grapes
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15
Q

what is the commercial use of ethene?

A
  • ripen demands in supermarkets
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16
Q

what is the commercial use of abscissic acid?

A
  • reduces drought stress
17
Q

What happens in stomata closure?

A
  • stomata closes to secure water (transpiration)
  • guard cells turgid - open
    -ABA binds to receptors in guard cell membrane
  • open calcium and potassium channels
    ions diffuse out of guard cells
  • increases water potential of guard cells
    water will leave the guard cell by osmosis - flaccid - stomata closes
18
Q

explain leaf loss by ethene?

A
  • old leaves make ethene
  • causes layer of cells in stalk of leave to expand and break
  • leaf falls
  • water and nutrients
19
Q

Explain seed germination?

A

starch is hydrolysed into glucose in seeds
- glucose is respired (ATP)
- seeds can germinate

Biology: Module 5 - Plant Responses (4 decks)

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