Plants Flashcards

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1
Q

Define tropism

A

Growth movement in response to stimulus

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2
Q

Describe negative tropism

A

Growing away from stimulus

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3
Q

Describe positive tropism

A

Towards stimulus

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4
Q

Describe negative phototropism

A

Growth away from light

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5
Q

Describe geotropism

A

Growth away from light

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6
Q

Auxin function

A

Promotes growth

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7
Q

Causes of tropisms

A
  • sunlight breaks down auxin
  • area of plant with shade= auxin accumulates
  • more growth on shaded side
    = lop sided growth
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8
Q

Why do plants compete

A
  • light and water
  • nutrients
  • space
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9
Q

Define phototropism

A

Shoots growing towards the light

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10
Q

Where is auxin produced

A

The tips of the plant

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11
Q

Describe how auxin works

A
  • light causes auxin to concentrate on the darker side of the shoot tip
  • auxin now spreads down the shoot
  • cells on darker side grow faster than cells in lighter side
    = causes shoot to grow towards light
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12
Q

Define geotropism

A

Plants growing towards gravity
(Downwards)

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13
Q

Describe how geotropism works

A
  • auxin produced at the root
    But
  • gravity causes auxin to concentrate on lower side
    = lower side grows more slowly than upper side
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14
Q

Use of giberellins

A

Starting the germination of seeds

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15
Q

Use of ethene

A

Controls cell division and the ripening of fruits

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16
Q

Uses of auxins in farming etc

A
  • weed killers
  • rooting powders
  • promoting growth in tissue culture
17
Q

Uses of giberellins in farming etc

A
  • end seed dormancy
  • encourage plants to flower
  • grow larger fruit
18
Q

Use of ethene eg farming

A
  • tigger bananas to ripen just before they are sold in the UK
19
Q

Function of fertilisers

A

Increase growth and reproduction of algae
= more food for plants
= higher plant population

20
Q

Use of auxin in roots

A

Inhibits cell growth
= lower side grows slower than upper side
= cause roots to grow towards force of gravity