The ozone layer of Earth's atmosphere helps to filter ultraviolet radiation. As the ozone layer is depleted, more ultraviolet radiation reaches Earth's surface. This increase in ultraviolet radiation may be harmful because it can directly cause
a) photosynthesis to stop in all marine organisms
b) tissue damage
c) increased cooling of the atmosphere
d) abnormal migration patterns in waterfowl
Ans: b) tissue damage
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a. natural abortion b. death around the age of 1 year c. survival until the early teens d. survival until the mid-thirties e. death around the age of 1 month
Which plants are widely planted in cities because of their resistance to air pollution?
a. lycopods b. ginkgos c. cycads d. conifers e. grasses
Development of drug resistance is encouraged by ________.
A. use of two drugs simultaneously with the hope that each will prevent the emergence of resistance to the other B. avoidance of indiscriminate use of drugs C. widespread use of broad-spectrum drugs D. use of a high enough concentration of the drug to destroy any spontaneous resistant mutants that might arise E. using drugs appropriate for the infectious agent being treated
Leaf abscission:a
occurs as a response to increased temperatures in temperate climates. b. occurs as a response to dry conditions in tropical climates. c. involves the formation of a tendril at the base of the petiole. d. occurs year-round on deciduous plants. e. does not occur in conifers