plant responses

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25 Terms

1
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What is a clinostat?

A revolving platform to equalize light and gravity.

2
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Define chemotropism.

Growth response to chemicals.

3
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What is geotropism?

Growth response to gravity.

4
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What is a growth regulator?

A substance that controls the growth of a plant.

5
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Define hydrotropism.

Growth response to water.

6
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What does it mean if a plant response is negative?

It grows away from the stimulus.

7
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Define phototropism.

Growth response to light.

8
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What does it mean if a plant response is positive?

It grows towards the stimulus.

9
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What is a stimulus?

A factor that causes a response.

10
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Define thigmotropism.

Growth response to touch.

11
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What is tropism?

The growth response of a plant to a stimulus.

12
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What was the control in the IAA experiment?

A petri dish containing water with no IAA solution.

13
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What effect did low concentration of IAA have on root growth?

It promoted root growth.

14
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What does serial dilution involve?

Making a series of diluted solutions by decreasing concentration in a step-wise manner.

15
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What is the role of auxins?

Cell elongation.

16
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What are gibberellins responsible for?

Breaking dormancy, cell elongation, and division.

17
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What is the function of abscisic acid?

It inhibits shoot growth.

18
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What does ethylene influence?

Ageing processes in plants.

19
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What is the significance of auxins in rooting powders?

They are used to promote root development in plant cuttings.

20
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How do plants protect themselves from herbivores?

Through adaptations such as thorns, stinging cells, or toxic chemicals.

21
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Where is auxin produced in plants?

In the apical meristems.

22
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What is apical dominance?

The inhibition of lateral bud growth by high auxin concentration at the shoot tip.

23
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What happens to lateral buds when the apical bud is removed?

They begin to develop and the plant becomes bushy.

24
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What was the purpose of placing one set of seeds in a clinostat during the phototropism experiment?

light exposure was equal from all sides

25
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What conclusion can be drawn from the phototropism experiment with the seedlings?

Seedling shoots are positively phototrophic.