5. Roaches are a common indoor pest in the south. Why must people routinely chan

Question

5. Roaches are a common indoor pest in the south. Why must people routinely change the brand of insecticide (roach killer) they use? a. The active ingredients in the insecticide break down over time. b. Antibiotic-resistance genes in roach DNA are transferred to uninfected roaches by contact with infected ones. c. The direct action of insecticides on roach DNA cause individual roaches to slowly become immune. Some individual roaches in the population may have a mutation providing some natural immunity to the first insecticide and their offspring will begin to predominate e Changes in the chemical formulation of insecticides constantly improve their effectiveness 6. Both Darwin and Wallace were greatly influenced by Thomas Malthus who observed that a. populations increase geometrically (exponentially). b. populations increase at the same rate as the food supply c. populations remain at their carrying capacity. d. food supply usually increases faster than the population that depends on it. 7. Examples of adaptive radiation of species would be easiest to find: a. near nuclear power plants b. in isolated regions with many diverse habitats. c. on mountain tops exposed to higher UV radiation. d. in moist, humid tropical rainforests. e. in areas with much human contact. 8. Gene flow is an evolutionary factor associated with: a. artificial selection b. random mating c. increased mutations d. migration of individuals e. small populations

Explanation / Answer

5. d) there may be some roaches with mutation that may have natural immunity. Over a period of time if same pesticide is used , somes roaches will get killed but those roaches who have mutation will be immune and offsprings will be also immune.So pesticides need to be changed

6.a) Thomas Malthus argued that because of the natural human urge to reproduce human population increases geometrically while food production increases arithmetically

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