Carbon dioxide enters a plant from the atmosphere through pores called
A. guard cells.
B. companion cells.
C. sieve tubes.
D. nodes.
E. stomata.
Ans: E. stomata.
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A variety of finch species within the Hawaiian Islands have acquired different types of beaks needed for utilizing specific food resources. The process by which these different species of finches came about is likely to have involved
A. natural selection. B. evolution. C. an accumulation of harmful genetic mutations. D. both natural selection and evolution. E. None of these choices are correct.
As a consequence of repeated use of a drug, larger and larger doses of the drug may be necessary in order to achieve the same effect. This is a consequence of the development of:
A) sensitization B) tolerance C) withdrawal D) cross-tolerance
Mechanical isolation may occur when two species have different:
A) sized and shaped copulatory organs B) courtship displays C) times of the day that they are sexually active D) habitat ranges E) chemical compatibilitie of their gametes
You manage 300 acres of patchy temperate forest. Which one of the following actions would increase the net primary productivity of the area the most?
A) adding fertilizer to the entire area B) introducing 100 rabbits into the area C) planting 500 new trees D) relocating all of the deer found in the area E) allowing dead trees to rot in the forest instead of removing them