Chapter Questions
An important difference between plant development and animal development is that_____.a. only plant development depends on hormonesb. plants continue to develop throughout their lifetimec. animals, but not plants, have a circulatory system
Plant hormones _____.a. trigger the same responses in animals and plantsb. are cues for tropismsc. do not participate in stress responsesd. may have different effects in different tissues
A plant cell's response to a hormone depends on _____.a. which hormone receptors it hasb. the way its hormone receptors work inside the cellc. the presence or absence of other hormonesd. all of the above
_____ is the hormone in most rooting compounds.a. Gibberellinb. Auxinc. Cytokinind. ABA
A tropism is a _____ response.a. defensiveb. directionalc. dilationald. detrimental
Which of the following statements is false?A. Auxin and gibberellin promote stem elongation.b. Cytokinin triggers growth of lateral buds.C. Abscisic acid promotes water loss and dormancy.d. Ethylene promotes fruit ripening and abscission.
Which combination of hormones is best for promoting the formation of lateral roots from pericycle?a. A high auxin level and low cytokinin levelb. A low auxin level and high cytokinin levelc. A high level of auxin and cytokinin
Ethylene differs from other hormones in that it _____.a. is a gasb. participates in defensec. operates during ripeningd. none of the above
_____ are organelles involved in gravitropism.
In some plants, flowering is a _____ response.a. phototropicb. gravitropicc. photoperiodicd. thigmotropic
Stomata close in response to _____.a. ABAb. nitric oxidec. bacterial flagellind. all of the above
Match the response with its main trigger._____phototropism_____gravitropism_____thigmotropism_____photoperiodism_____vernalization_____heliotropisma. contact with an objectb. blue lightc. long period of coldd. gravitye. sun positionf. night length
Match the hormone with the description._____ethylene_____cytokinin_____auxin_____gibberellin_____ABA_____nitric oxidea. efflux carriers set up gradientsb. produced in positive and negative feedback loopsc. affects expression of more genes than any other hormoned. works antagonistically to auxin in apical dominancee. big in stemsf. active in bursts
Systemic acquired resistance _____.a. occurs in response to pathogen detectionb. causes the release of volatile chemicalsc. is a hypersensitive response to pathogensd. defends the plant against herbivorye. does not involve hormones
Match the hormone with the observation._____ethylene_____cytokinin_____auxin_____gibberellin_____ABA_____nitric oxidea. Your cabbage plants form elongated flowering stalks.b. The potted plant in your room is leaning toward the window.c. The last of your apples is getting really mushy.d. The seeds of your roommate's marijuana plant do not germinate no matter what he does to them.e. Lateral buds are sprouting.f. Your lettuce plants develop brown spots on their leaves.