Plant Hormones Flashcards

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1
Q

Why do plants produce hormones?

A
  • Plants produce hormones to co-ordinate and control responses to light and gravity.
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2
Q

What is the response to light (by growth/ movement) called in plants?

A
  • Phototropism.
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3
Q

What is the response to gravity (by growth/ movement) known as in plants?

2 different KEYWORDS

A

1.) Gravitropism.
2.) Geotropism

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4
Q

What is meant by “seed germination?”

A
  • When a seed becomes a plant.
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5
Q

Why are gibberellins (a hormone) important in plants?

A
  • Gibberellins are important in initiating seed germination.
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6
Q

What does ethene (a hormone in plants) control?

A
  • Ethene controls cell division and ripening of fruits.
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7
Q

What are responses to light and gravity controlled by in plants?

A
  • Responses to light/ gravity are controlled by the hormone: auxin.
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8
Q

What is the difference between agriculture and horticulture?

A
  • Agriculture: growing food crops/ could include animals.
  • Horticulture: growing plants for gardens.
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9
Q

What are the 3 main uses of auxins in agriculture and horticulture?

A

1.) Auxins are used as weed killers.
2.) as rooting powders (powders to put cuttings of plants in.)
3.) for promoting growth in tissue cultures (promoting growth of cuttings…)

() - extra info for understanding…

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10
Q

What are the 3 main uses of gibberellins?

A

1.) Gibberellins can be used to end seed dormancy (encourage a seed to geminate into a plant quickly.)
2.) Giberellins can be used to encourage flowering.
3.) Giberellins can be used to increase fruit size.

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11
Q

What is ethene used for in agriculture?

A
  • Ethene is used to control the ripening of fruit during storage and transport.
  • Ie. fruits may be harvested before they are ripe. Ethene would be used to trigger the fruit to ripen just before it is sold.
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12
Q

What causes unequal growth rates in plant roots and shoots?

A
  • Unequal distributions of auxin cause unequal growth rates in plant roots/ shoots.
  • This will allow the plant roots/ shoots to move and change shape - responding to gravity/ light.
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