A high auxin to cytokinin ratio provide shoot formation while a high cytokinin to auxin ratio provide root formation. Lütfen birini seçin: O a. False O b. True
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- Which combination of hormones is best for promotingthe 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 cytokininWhich 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 abscissionIdentify the wrong match a.Senescence —Both auxin and ABA promote it b.Apical dominance — Auxin induces and Cytokinin counteracts c.Dormancy — Both ethylene and GA break it d.Callus differentiation — Auxin and cytokinins
- A plant mutant that shows normal gravitropic bending butdoes not store starch in its plastids would require a reevaluationof the role of _____________ in gravitropism.(A) auxin(B) calcium(C) statoliths(D) differential growthWhich of the following statements about phototropism is/are not true? A. Red light is the most effective light wavelength for positive phototropism of plants. B. Higher auxin concentration on the lighted side causes that side to elongate more than the non illuminated side. C. Phototropins are the only effective light receptors in phototropism. D. Phototropism decreases the plant's ability to enhance photosynthetic capacity. E. All of the above F. None of the aboveWhich of the following would not be found in the shoot system of aplant?a. stemb. leavesc. rootsd. All of these are correct.
- When a dicot seed sprouts,a. a coleoptile protects the emerging shoot.b. the shoot develops more rapidly than the root.c. the shoot absorbs nutrients directly from theendosperm.d. a root cap protects the emerging root.Pruning plants can promote lateral stems and increased plant biomass by _____________. Select one: a. suppressing cytokinin transport b. suppressing auxin transport c. promoting cytokinin transport d. promoting auxin transportMatch the hormone with the description. ___ ethylene a. efflux carriers set up gradients ___ cytokinin b. produced in positive and ___ auxin negative feedback loops ___ gibberellin c. affects expression of more ___ ABA genes than any other hormone ___ nitric oxide d. works antagonistically to auxin in apical dominance e. big in stems f. active in bursts
- . Charles and Francis Darwin discovered that(A) auxin is responsible for phototropic curvature.(B) red light is most effective in shoot phototropism.(C) light destroys auxin.(D) light is perceived by the tips of coleoptiles.If you exposed seeds to a series of red light versus far-red light treatments, which of the following exposure treatments would result in seed germination? a. Red; far-red b. Far-red; red c. Red; far-red; red; far-red; red; far-red; red; far-red d. Both a and c are correct.Which of the following plant hormones is produced in the root meristems, travel upward and in higher concentration counter the apical dominance caused by ____________? a. Gibberellins b. Ethylene c. Cytokinin d. Abscisic acid
