plant hormones

1. Which plant hormone is responsible for phototropism and gravitropism?

•    a) Gibberellins

• b) Cytokinins

•    c) Ethylene

• d) Auxins

2. Which hormone triggers fruit ripening and leaf senescence in plants?

•    a) Cytokinins

• b) Gibberellins

• c) Ethylene

•    d) Abscisic Acid

The figure above shows an experiment

that is done on two plants of the same species. Both plants are left in the open.

What will happen to the two plants after two weeks

I Plant B bends towards the opening of

the box.

II The auxin in stem A is distributed

uniformly.

III The auxin in stem B is not distributed

uniformly.

IV Plant A bends to the right.

• I, II and III only.

• I, II and IV only.

• I, III and IV only.

• II, III and IV only.

What is the reaction that is shown by the plant in the figure above?

• Positive hydrotropism.

• Negative phototropism.

• Positive thigmotropism.

• Negative geotropism.

What is the phenomenon that is affecting the growth of the bean shoot

• gravitrophism

• phototropism

• thigmotrophism

• rapid movement

Stimulates cell division

• abscisic acid

• auxin

• cytokinins

• gibberellin

• ethylene

Which of the following are plant hormones

• Auxin

• Cytokinin

• Gibberellin

• Abcissic acid, ethylene

• All

Auxins are responsible for _____________ of a plant

• Colour change

• Watering

• Phototropism

• Growth

The figure above shows four coleoptiles P, Q, R and S that are exposed to unilateral light. After two days, which coleoptile will move towards the light?

• P only.

• R only.

• P and R only.

• P, Q and S only.

The figure above shows a mimosa plant. What is the conclusion that can be derived based on the reaction in the figure.

• The mimosa plant shows a seismonastic reaction.

• The leaf of the mimosa becomes sturgid when touched.

• The osmotic pressure in the mimosa cell increases when touched.

• The temperature of the glass rod becomes very high until the leaf fades when touched.