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Biology B1 > Controlling Plant Growth > Flashcards

Controlling Plant Growth Flashcards

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1
Q

Give four examples of hormones that control plants

A
  1. Auxins
  2. Ethylene
  3. Gibberellins
  4. Cytokinins
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2
Q

What are plants controlled by?

A

Hormones

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3
Q

What is phototropism?

A

Phototropism is growth in response to light

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4
Q

What is geotropism?

A

Geotropism is growth is response to gravity

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5
Q

What is positive phototropism?

A

The plant growing towards light

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6
Q

What is positive geotropism?

A

The plant is growing towards gravity

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7
Q

What is negative phototropism?

A

The plant is growing away from light

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8
Q

What is negative geotropism?

A

The plant is growing away from gravity

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9
Q

When is auxin produced?

A

At the tip and it diffuses backwards to stimulate cell elongation process which occurs in the cells just behind the tips

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10
Q

What does auxin do?

A

Auxin promotes growth in the shoot, but actually inhibits growth in the root

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11
Q

Explain positive phototropism?

A

Auxin collects on shaded side making cells elongate

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12
Q

Explain positive geotropism

A

Auxin collects on bottom side making cells grow less

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13
Q

Explain negative phototropism

A

Auxin collects on shaded side making cells divide less

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14
Q

Explain negative geotropism

A

Auxin collects on bottom side making cells grow more

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15
Q

Plants use hormones commercially as:

A
  1. Selective weed killers
  2. Rooting powder
  3. Fruit ripening (delay or acceleration)
  4. Control of dormancy
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16
Q

What are the type of leaves most weeds grow in fields?

A

Broad leaves

17
Q

What commercial use can affect broad leaves?

A

Selective weed killers. The disrupt their normal growth patterns, which soon kills them, whilst leaving the grass and crops untouched

18
Q

What is the name of the part of the plant that has been cut off?

A

Cuttings

19
Q

What do you add to make a cutting grow?

A

Rooting powder

20
Q

What do cuttings allow the farmers to do?

A

They allow the farmers to produce a lot of clones

21
Q

What is it useful to use plant hormones to delay ripening?

A

Because it’s easier to transport

22
Q

What is a seed that won’t germinate until it experiences certain conditions called?

A

Dormancy

23
Q

What hormone allows the seeds to germinate?

A

Gibberellin

24
Q

Why is gibberellin useful for commercial growers?

A

Because commercial growers can treat seeds with gibberellin to make them germinate at times of year when they wouldn’t normally. It also helps to make sure all the seeds in a batch germinate at the same time

Biology B1 (8 decks)

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