Plant Growth Regulators Quiz

Which of the following is not a characteristic of plant growth regulators?

• Small, simple molecules of diverse chemical composition

• Can be broadly divided into two groups based on their functions

• Only involved in plant responses to wounds and stresses

• Involved in growth promoting activities

Who discovered the plant growth regulator auxin?

• F.W. Went

• E. Kurosawa

• F. Skoog

• Charles Darwin

Which plant growth regulator is used to speed up the malting process in the brewing industry?

• Auxin

• Ethylene

• Gibberellins

• Cytokinins

What is the main effect of cytokinins on plants?

• Promote nutrient mobilisation

• Promote root growth and root hair formation

• Stimulate the closure of stomata

• Delay leaf senescence

Which plant growth regulator is known as the stress hormone?

• Auxin

• Abscisic acid

• Cytokinins

• Gibberellins

What is the main effect of ethylene on fruit ripening?

• Enhances the respiration rate

• Decreases the respiration rate

• Delays the ripening process

• Promotes rapid internode/petiole elongation

Which plant growth regulator is used to initiate flowering and for synchronising fruit-set in pineapples?

• Cytokinins

• Ethylene

• Auxin

• Gibberellins

What is the main effect of abscisic acid on seed germination?

• Stimulates seed germination

• Inhibits seed germination

• Promotes rapid internode/petiole elongation

• Promotes nutrient mobilisation

Which plant growth regulator is involved in the phenomenon of apical dominance?

• Abscisic acid

• Auxin

• Gibberellins

• Cytokinins

What is the main function of plant growth regulators in the life of a plant?

• Control extrinsic factors

• Control environmental factors

• Control genomic activities

• Control intrinsic activities