What do you think would result if nitrogen-fixing cyanobacteria populations suddenly declined?
A. Aquatic primary production would decline, particularly in regions not subject to fertilizer runoff.
B. Legumes would cease to grow, but other types of plants would be unaffected.
C. Both the aquatic and terrestrial populations of autotrophs would collapse.
D. Populations of denitrifying bacteria would expand to take over their role, creating only a temporary disruption.
E. More nitrogen would become available for other aquatic autotrophs.
A. Aquatic primary production would decline, particularly in regions not subject to fertilizer runoff.
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A mutualistic association between a plant root and a fungus is known as a
(a) sac fungus. (b) lichen. (c) mycorrhizal root. (d) club fungus.
When scientists examined fossils of Ordovician trilobites, they found that a sample from any given stratum was almost
always intermediate in their morphology between samples from strata just above or below it, providing evidence of ____.
a. convergent evolution b. rapid speciation c. adaptive radiation d. punctuated equilibrium e. phyletic gradualism
While on a field trip near the ocean coastline, you visit a company that harvests jellylike substance from protists. This substance can be used as food, or in biology lab dishes for culturing organisms that have red-blue pigments, and store starch like plants. The company extracts the substance from multicellular plant-like organisms. You are observing the economic values of
A. algin. B. gelatin. C. carrageenan. D. red ooze. E. agar.
Solid color allele is dominant to striped, and long
hair allele is dominant to short hair in a laboratory animal. If the mating of a long, solid animal with a short, striped animal produces the maximum number of phenotypes, how many will be produced? a. 1 b. 2 c. 4 d. 8