GR 12 PLANT HORMONES: EXAM BOOKLET MCQs

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Ms Cronje

Mrs Vissian

Ms Viljoen

OTHER

1.1. Which plant hormone promotes seed dormancy? *

Gibberellin

Auxin

Abscisic acid

Growth hormone

1.2. The graph below shows the effect of different concentrations of gibberellins on the germination of seeds. One possible conclusion drawn from the results shown, is that the... *

gibberellin concentration has no effect on the germination of the seeds.

highest percentage of seed germination occurs at the gibberellin concentration of 1500 mg/l.

highest percentage of seed germination occurs at the gibberellin concentration of 1000 mg/l.

lowest percentage of seed germination occurs at a gibberellin concentration of 1000 mg/l.

1.3. A gardener removes the apical buds from a rose bush in her garden regularly. As a result the rose bush will... *

produce more lateral branches.

grow taller.

remain the same size.

produce fewer roses.

1.4. Which ONE of the following is a function of gibberellins? *

Apical growth

Stimulation of seed germination

Inhibition of side branches

Dropping of leaves in winter

1.5. Which ONE of the following plant hormones is responsible for the germination of seeds? *

Growth hormone

Abscisic acid

Gibberellin

Auxin

1.6. Which is used by plants to reduce the chances of being fed upon by herbivores? *

Chemicals

Thorns

Both of the above

None of the above

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