30 Questions
Which hormone promotes cell elongation and is involved in pollen development?
Brassinosteroids
Which hormone is responsible for promoting senescence and fruit ripening?
Ethylene
Which hormone is involved in seed maturation and germination?
ABA
Which hormone is rapidly induced by wounding or herbivory and contributes to systemic defense responses?
Jasmonates
Which hormone is induced by pathogen attack and contributes to systemic acquired resistance to pathogens?
Salicylates
Which hormone is involved in floral evocation and is subject to environmental and hormonal controls?
Gibberellin
Which hormone is involved in responses to abiotic stress and biotic stress in plants?
ABA
Which hormone is known for its role in promoting senescence?
Ethylene
Which hormone is required for seed maturation and dormancy?
Abscisic Acid
Which hormone is known for its role in promoting flowering?
Gibberellins
Which hormone is involved in defense against herbivory?
Jasmonates
Which hormone is known for its role in auxin transport?
Auxin
Which hormone is involved in the green revolution?
Gibberellins
Which hormone is induced upon pathogen attack?
Salicylates
Which hormone is involved in hormone signaling?
Auxin
Which hormone is known for its role in stomatal aperture?
Abscisic Acid
Which of the following is a well-studied example of pheromones?
Yeast mating factors
What does the presence of pheromone signaling pathways in single-celled organisms suggest about the evolutionary origins of hormones in multicellular organisms?
Pheromones evolved before hormones
What might be an advantage of a signal transduction pathway that involves proteolysis of a repressive protein as a way to activate a response?
Faster response time
How does the phosphorelay system that operates downstream of cytokinin receptors differ from the protein kinase / phosphatase system that operates downstream of the ethylene and brassinosteroid receptors?
Phosphorelay system involves phosphorylation, while protein kinase/phosphatase system involves dephosphorylation
Plants with defects in ABA or gibberellin synthesis and signaling pose particular problems for geneticists. What phenotypes associated with these defects are particularly problematic?
Extreme hypersensitivity to ABA
What options are available to geneticists when faced with problems associated with plants that have defects in ABA or gibberellin synthesis and signaling?
Modify ABA or gibberellin signaling
Which of the following hormones are not yet known to have receptors?
Strigolactones
Which of the following is NOT a plant hormone?
Insulin
How many "classical" plant hormones are there?
Five
What processes contribute to plant hormone accumulation?
Transpiration
How does auxin regulate phototropism?
By stimulating cell elongation on the shaded side of a plant
True or False: Auxin and ethylene act antagonistically in most processes.
False
What are the commercial applications of controlling ethylene synthesis and response?
Delaying fruit ripening
The jasmonate receptor is very similar to the receptor of which other hormone?
Abscisic acid
Test your knowledge of gibberellin synthesis and its role in plant growth with this quiz! Learn about the biochemical pathway, the role of GA-deficient dwarf plants, and the effects of gibberellin perception on growth-inhibitory proteins. Challenge yourself with questions on gibberellin production and its impact on fungal spore dispersal.
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