Plant Hormones Quiz

What is the primary function of auxins in plants?

• Promoting cell elongation and growth

• Inhibiting cell elongation and growth

• Regulating photosynthesis

• Controlling water uptake

How do auxins promote cell elongation in plants?

• By inhibiting cell division

• By decreasing the plasticity of the cell wall

• By reducing water uptake in the cells

• By increasing the plasticity of the cell wall

Name the plant hormone responsible for phototropism and geotropism.

• ethylene

• auxin

• gibberellin

• cytokinin

Explain the role of auxins in apical dominance.

• Auxins promote the growth of lateral buds

• Auxins inhibit the growth of lateral buds

• Auxins have no effect on lateral buds

• Auxins stimulate the growth of apical buds

What is the role of gibberellins in seed germination?

• Cause seed germination by inducing dormancy

• Promote seed germination by breaking dormancy and stimulating enzyme production

• Have no effect on seed germination

• Inhibit seed germination by preventing enzyme production

How do gibberellins promote stem elongation in plants?

• By reducing water uptake in the stem tissues

• By promoting leaf growth instead of stem growth

• By stimulating cell division and elongation in the stem tissues

• By inhibiting cell division in the stem tissues

Name the plant hormone responsible for inducing dormancy in seeds and buds.

• ABA

• Auxin

• Gibberellin

• Cytokinin

Explain the role of abscisic acid in stomatal closure.

• Abscisic acid promotes the opening of stomata by increasing turgor pressure in guard cells.

• Abscisic acid has no effect on stomatal closure.

• Abscisic acid causes the guard cells to shrink and die, leading to stomatal closure.

• Abscisic acid triggers the closure of stomata by causing the guard cells to lose turgor pressure.

How does abscisic acid regulate seed dormancy and germination?

• By promoting seed germination and inhibiting seed dormancy through its interaction with other plant hormones.

• By having no effect on seed dormancy and germination.

• By causing rapid seed germination and preventing seed dormancy through its interaction with other plant hormones.

• By inhibiting seed germination and promoting seed dormancy through its interaction with other plant hormones.

What is the role of abscisic acid in response to environmental stress?

• It promotes excessive water loss in plants under stress

• It helps plants respond to environmental stress by closing stomata to reduce water loss and promoting the synthesis of stress-related proteins.

• It causes plants to wilt and die under stress

• It has no role in response to environmental stress