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Q. No.The given diagrammatic representation of the operation of natural selection on a trait shows:
1. Stabilizing selection
2. Directional selection
3. Disruptive selection
4. Discontinuous selection
Subtopic: Hardy Weinberg Law |
90%
From NCERT
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In an area where Biston betularia is found, environmental pollution is controlled after strict law enforcement. What do you expect should happen to the colour of moths found in the area?
| 1. | dark-colored moths should change to light-colored |
| 2. | light-colored moths should change to dark-colored |
| 3. | dark-colored moths should become more common |
| 4. | light-colored moths should become more common |
Subtopic: Concept of Organic Evolution: Evidence |
71%
From NCERT
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Study the given two statements:
| Statement I: | The eye of the octopus and the eye of mammals are homologous. |
| Statement II: | Sweet potato and potato are an example of homology. |
| 1. | Statement I is incorrect; Statement II is correct |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Concept of Organic Evolution: Evidence |
75%
From NCERT
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The frequencies of dominant and recessive alleles of a gene in a population are 0.7 and 0.3 respectively. The expected frequency for heterozygotes in the population is likely to be:
1. 42%
2. 49%
3. 21%
4. 9%
1. 42%
2. 49%
3. 21%
4. 9%
Subtopic: Hardy Weinberg Law |
83%
From NCERT
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Identify the correct statement:
| 1. | Evolution by natural selection works best on a population having no variation. |
| 2. | Mutation is a relatively unimportant source of variation and is not the foundation for evolution. |
| 3. | The effects of genetic drift are most apparent in small populations. |
| 4. | Inbreeding increases the proportion of heterozygous individuals in a population. |
Subtopic: Difference Between Drift & Selection | Hardy Weinberg Law |
79%
From NCERT
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Embryological support for evolution was proposed by:
1. Ernst Mayr
2. Ernst Haeckel
3. Hugo de Vries
4. Kary Mullis
Subtopic: Embryological Evidence of Evolution |
83%
From NCERT
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A process in which heritable variations enabling better survival are enabled to reproduce and leave greater number of progeny is called:
1. Evolution
2. Saltation
3. Speciation
4. Natural selection
1. Evolution
2. Saltation
3. Speciation
4. Natural selection
Subtopic: Hardy Weinberg Law |
77%
From NCERT
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In 1953, S.L. Miller created conditions similar to those suggested by Oparin and Haldane in a laboratory where he created electric discharge in a closed flask containing:
| 1. | CH4, H2, NH3 and water vapour at 800°C |
| 2. | CH4, H2, HCN and hydrogen sulphide at 400°C |
| 3. | CO2, H2, NH3 and water vapour at 800°C |
| 4. | CO2, H2, HCN and hydrogen sulphide at 400°C |
Subtopic: Urey & Miller Experiment |
94%
From NCERT
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Darwin’s finches represent one of the best examples of:
1. Saltation
2. Sympatric speciation
3. Adaptive radiation
4. Convergent evolution
1. Saltation
2. Sympatric speciation
3. Adaptive radiation
4. Convergent evolution
Subtopic: Additional Theories of Darwin | Concept of Organic Evolution: Evidence |
94%
From NCERT
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Populations at genetic equilibrium [Hardy Weinberg equilibrium]:
1. are very small
2. are not experiencing any natural selection
3. have individuals frequently going out and coming in
4. are mating randomly
Subtopic: Hardy Weinberg Law |
62%
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