Plant Hormones and Responses Quiz

What is thigmotropism?

• A plant’s growth in response to light

• A plant’s growth in response to gravity

• A plant’s growth in response to touch

• A plant’s movement due to temperature

Which plant hormone is most closely associated with cell elongation and phototropism?

• Cytokinin

• Ethylene

• Auxin

• Gibberellin

Which of the following best describes a positive thigmotropic response?

• Roots growing away from water

• Tendrils coiling around a support

• Leaves turning toward light

• Roots growing downward

Which hormone promotes fruit ripening and leaf fall?

• Gibberellin

• Auxin

• Cytokinin

• Ethylene

What is the main role of gibberellins in plants?

• Preventing cell division

• Promoting seed germination and stem elongation

• Inhibiting flowering

• Triggering leaf loss

Which hormone delays aging and promotes cell division?

• Auxin

• Gibberellin

• Cytokinin

• Abscisic acid

What effect does abscisic acid have on seeds?

• Stimulates growth

• Causes ripening

• Inhibits germination

• Promotes flowering

Which plant movement is not a type of tropism?

• Thigmotropism

• Gravitropism

• Hydrotropism

• Photosynthesis

Where is auxin mainly produced in a plant?

• In the roots

• In the stem

• In the leaves

• In the shoot tip

What happens to auxin when light hits one side of a shoot?

• It breaks down

• It moves evenly throughout the plant

• It moves to the shaded side, causing the plant to bend toward light

• It evaporates