Roaches are a common indoor pest in the south. Why must people routinely change
ID: 92219 • Letter: R
Question
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. The direct action of insecticides on roach DNA cause individual roaches to slowly become immune. d. 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. 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 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.Explanation / Answer
5.
It is a good practice to change the brand of insecticide frequently. This is due to the fact that some insects in a population might be resistant to the insecticide. So, such individuals can survive and propagate.
If we change the brand of insecticide frequently, such small populations can also be effectively eliminated as they may not be resistant to all the chemicals in different insecticides.
So, option D is correct.
6.
Thomas Robert Malthus was an English population biologist who influenced Darwin's ideas on evolution.
He wrote 'An essay on principles of populations'.
He stated that populations increase in geometric manner whereas resources increase in arithmetic manner.
So, option A is correct.
7.
Adaptive radiation results in divergent evolution.
Divergent evolution occurs when a small group of individuals are isolated from its parent group and subjected to different selection pressure.
Divergent evolution can be seen in isolated regions with diverse habitats.
So, option B is correct.
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