Which class of hormones produced in the roots of plants promotes cell division and growth and retards the aging of flowers and leaves?
A) gibberellins
B) phytochromes
C) cytokinins
D) ethylene
Answer: C
Biology & Microbiology
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Autotrophy has been observed among the ________.
A. cyanobacteria B. extreme thermophiles C. methanogens D. All of the choices are correct.
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Top-down factors that can control the population sizes of plants or animals include
A. seed-dispersing birds. B. parasites and predators. C. widespread phoresy. D. resource partitioning. E. Batesian mimicry.
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Species identification is based on all of the following except:
a. DNA-DNA Hybridization. b. 16sRNA sequencing. c. Cell wall composition. d. Colonial pigmentation.
Biology & Microbiology
The different beaks of the many Galapagos finch species are homologous because they are variations of a common ancestral body plan.
a. true b. false
Biology & Microbiology