Q. No.Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
1.
Overproduction, variations, constancy of population size, natural selection
2.
Variations, constancy of population size, overproduction, natural selection
3.
Overproduction, constancy of population size, variations, natural selections
4.
Variations, natural selection, overproduction, constancy of population size
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According to Oparin, which one of the following was not present in the primitive atmosphere of the earth?
| 1. | Oxygen | 2. | Hydrogen |
| 3. | Water vapour | 4. | Methane |
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The age of fossils in the past was generally determined by the radiocarbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms include:
| 1. | study of the conditions of fossilization. |
| 2. | electron spin resonance (ESR) and fossil DNA. |
| 3. | study of carbohydrates/proteins in rocks. |
| 4. | study of carbohydrates/proteins in fossils. |
There are two opposing views about the origin of modern man. According to one view, Homo erectus in Asia were the ancestors of modern man. A study of variation of DNA, however, suggested the African origin of modern man. What kind of observation of DNA variation could suggest?
| 1. | Greater variation in Asia than in Africa. |
| 2. | Similar variation in Africa and Asia. |
| 3. | Variation only in Asia and no variation in Africa. |
| 4. | Greater variation in Africa than in Asia. |
Which one of the following experiments suggests that the simplest living organisms could not have originated spontaneously from non-living matter?
| 1. | Larvae could appear in decaying organic matter. |
| 2. | Meat was not spoiled, when heated and kept sealed in a vessel. |
| 3. | Microbes did not appear in stored meat. |
| 4. | Microbes appeared from unsterilized organic matter. |
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Which one of the following phenomena supports Darwin’s concept of natural selection in organic evolution?
| 1. | Production of Dolly, the sheep by cloning. |
| 2. | Development of organs from stem cells for organ transplantation. |
| 3. | Development of transgenic animals. |
| 4. | Prevalence of pesticide resistant insects. |
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At a particular locus, the 'A' allele frequency is 0.6 and that of 'a' allele is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?
| 1. | 0.24 | 2. | 0.16 |
| 3. | 0.48 | 4. | 0.34 |
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One of the important consequences of geographical isolation is:
| 1. | Random creation of new species |
| 2. | No change in the isolated fauna |
| 3. | Preventing speciation |
| 4. | Speciation through reproductive isolation |
What is true about the isolated small tribal populations?
| 1. | There is no change in population size as they have a large gene pool. |
| 2. | There is a decline in population as boys marry girls only from their own tribe. |
| 3. | Hereditary diseases like color blindness do not spread in the isolated population. |
| 4. | Wrestlers who develop strong body muscles in their lifetime pass this character on to their progeny. |
| Convergent evolution | Divergent evolution | |
| 1. | Bones of forelimbs of vertebrates | Wings of butterflies and birds |
| 2. | Thorn of Bougainvillea and tendrils of Cucurbita | Eye of Octopus and mammals |
| 3. | Eye of Octopus and mammals | Bones of forelimbs of vertebrates |
| 4. | Thorns of Bougainvillea and tendrils of Cucurbita | Wings of butterflies and birds |
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