Which ecological problem might result from fertilizing a golf course with phosphorus-rich fertilizer?
A) poisoning of the grass caused by excess phosphorus
B) heavy growth of algae and cyanobacteria in lakes and rivers caused by phosphorus runoff
C) accumulation of toxic levels of phosphorus in animals in the vicinity, especially those higher on the food chain
D) a slowdown in the weathering of rock that releases phosphates into the soil under natural conditions
Answer: B
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Mutations are _____________.
A.usually weeded out of a population. B.usually neutral. C.usually beneficial. D.necessary for evolution. E.usually detrimental.
Oncogenes are often ____
a. mutant forms of cell cycle genes b. normal forms of cell cycle genes c. needed for normal cells to metastasize d. required for normal contact inhibition of cells e. not involved in cell division
What ultimately is the greatest threat to
biodiversity?
a. plant pathogens b. exotic species c. unthinking humans d. mineral and energy use e. conservation efforts
If you get a Simpson's index of 1, this means
A) there is only one species in the community. B) all species are in equal proportions. C) the calculation is incorrect as this is theoretically impossible. D) the Shannon index will equal 0.