Q. No.The natural selection operating as shown in the given figure is called as:
1.
Disruptive
2.
Directional
3.
Stabilizing
4.
Retrogressive
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Similar biological structures or sequences in different taxa are homologous if they:
| 1. | always perform the same function |
| 2. | result from convergent evolution |
| 3. | do not serve any known function |
| 4. | are derived from a common ancestor |
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All the following are examples of evolution by anthropogenic action except:
| 1. | Industrial melanism seen in peppered moth |
| 2. | Pesticide resistance in pests |
| 3. | Emergence of antibiotic resistant bacteria |
| 4. | Streamlined body in dolphins |
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The process of evolution of different species in a given geographical area starting from a point and literally radiating to other areas of geography [habitats] is known as:
| 1. | Convergent evolution | 2. | Divergent evolution |
| 3. | Adaptive radiation | 4. | Artificial selection |
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1. Founder effect
2. Genetic bottleneck
3. Adaptive radiation
4. Convergent evolution
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Karn & Penrose (1951) showed that birth weight follows a normal distribution, that mortality for newborns is greater for those either under or over-weight, and that the mean birth weight (7 lbs) coincides with that showing minimum mortality.
What type of natural selection is taking place in this case?
1. Stabilizing
2. Directional
3. Disruptive
4. Natural selection is not taking place in this case
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Assume that 4 % of people in a population are born with sickle cell anemia [Sickle cell anemia is autosomal recessive]. What percentage of individuals will have the selective advantage of the sickle-cell trait?
| 1. | 16 % | 2. | 32 % |
| 3. | 36 % | 4. | 96 % |
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A thorn of Bougainvillea and a tendril of Cucurbita are an example of :
| 1. | analogous organs | 2. | vestigial organs |
| 3. | homologous organs | 4. | defense organs |
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Which theory, regarding the origin of life, is alternatively also called “panspermia”?
| 1. | Special Creation | 2. | Spontaneous Generation |
| 3. | Cosmozoan Theory | 4. | Biochemical Evolution |
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The wings of an insect and the wings of a bird are examples of:
| 1. | analogous structures | 2. | homologous structures |
| 3. | vestigial structures | 4. | phylogenetic structures |
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