12. In the late 1960s, Robert Paine conducted landmark studies on diversity in t
ID: 267144 • Letter: 1
Question
12. In the late 1960s, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars. After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A) The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B) The sea star kept the mussels and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C) The mussels and the barnacles parasitized the sea stars, keeping populations low enough to prevent competitive exclusion from occurring. D) The sea stars developed a mutualistic relationship with the mussels and barnacles, keeping their populations low and preventing competitive exclusion from happening. 13. A gardener treats his plants with pesticides, killing any aphids. Once the aphids die, what likely happens to the mutualistic bacteria inhabiting their digestive tracts? A) The bacteria would contribute to the decomposition of dead aphids. B) The bacteria would migrate outside of the digestive tract, and survive on the C) The bacteria would likely die without their mutualistic aphids, as this is an D) The bacteria would likely die without their mutualistic aphids, as this is an leaves of garden plants. example of a facultative relationship example of an obligate relationship. 14. Climate along the equator is due to A) Hot and dry; absorption of more sunlight per unit area. B) Hot and wet; absorption of more sunlight per unit area. C) Cold and dry; absorption of less sunlight per unit area. D) Cold and wet; absorption of less sunlight per unit area. 15. Autotrophs remove from the air and fix this into tissues providing for secondary consumers A) nitrogen; energy B) carbon dioxide; energy C nitrogen; amino acids D) carbon dioxide; inorganic moleculesExplanation / Answer
12. B. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring.
13. D. The bacteria would likely die without their mutualistic aphids, as this is an example of an obligate relationship.
14. B. Hot and wet; absorption of more sunlight per unit area.
15. B. Carbon dioxide; energy.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.