1. Most commercial pesticides are effective for only two or three years because:
ID: 192406 • Letter: 1
Question
1. Most commercial pesticides are effective for only two or three years because: A) the chemicals induce mutations that provide immunity B) the chemicals mutate and become ineffective. C) the pests learn to hide when the chemicals are being applied. D) those pests born with mutations that provide immunity will survive and reproduce. E) new pests invade the area. 2. 2 Why was Darwin and Wallace's theory of evolution by natural selection revolutionary? A) It proved that individuals acclimated to their environment over time. B) It dismissed the idea that species are constant and emphasized the importance of variation and change in populations. C) It was the first time a biologist had proposed that species changed through time. D) It was the first theory to refute the ideas of special creation 3. 3. Many crustaceans (eg, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have d are not used in swimming. This is an example of A) a homologous structure C) natural selection B) a vestigial trait D) an adaptation 4. Wh en unrelated organisms living under similar environmental demands evolve superficially 4 similar structures, it is called: A) comparative anatomy C) superficial selection. B) coevolution. D) convergent evolution. 5. Cotton-topped tamarins are small primates with tufts of long white hair on their heads. 5. While studying these creatures, you notice that males with longer hair opportunities to mate and father more offspring. You believe that having longer hair is adaptive to these males. You should get more A) conclude that natural selection will lead to males with longer hair in your population B) conclude that longer haired males survive better than their shorter haired counterparts C) conclude that there is not enough variation in hair length for natural selection to act D) look for evidence that longer haired males have higher fitnessExplanation / Answer
1. D Most pesticides fail to work after few years of application because the pests learn mechanism to avoid the action of thoses chemicals upon them, Also these changes are introduced as mutation in their genome and hence they become resistant.
2 B. Darwin's and Wallace's theory became revolutionary because it proved that species do not remain contant over the ages and they change in order to adapt to their environment.
3B. This seems to be a vestigeal trail in crab. Vestigeal organs are those which has been present in organisms of same genus but have lost function over time.
4D. This is the definition of convergent evolution where unrelated organism evolve together in order to suit the environment.
5D. If female counterparts prefer long hair males, then they should be fit enough to become a choice as a father.
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