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Q. No.For differential success in reproduction, all the following must be present except:
1.
Gene flow between populations.
2.
Variations must be genetically inherited.
3.
Certain variations allow an individual to produce more offspring that survive in the next generation.
4.
There must be variations in the phenotypes of individuals.
Subtopic: Sources of Variation |
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Identify the correct statement:
| 1. | As the coacervates do not have lipid outer membranes and cannot reproduce, they alone could not have been the precursors of life. |
| 2. | The microspheres could not be induced to constrict but had a large amount of diversity. |
| 3. | The earliest life was probably not driven by solar energy as is seen today. |
| 4. | Protobionts cannot separate a combination of molecules from the surroundings or maintain an internal environment, but are able to reproduce. |
Subtopic: Examples of Chemical Evolution | Other Theories of Origin of Life |
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Which of the following statements is incorrect regarding an evolutionary trend?
| 1. | It is the continuous change of a character within an evolving lineage. |
| 2. | The number of trends in any lineage is the same as the number of characters evolving. |
| 3. | A trend may be progressive or retrogressive. |
| 4. | Direction and speed of evolutionary trends in a lineage are universal throughout the family and are not subject to variations. |
Subtopic: Modern Theory of Evolution |
70%
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Which of the following is not a major evolutionary trend seen in the evolution of horses?
| 1. | Progressive increase in the number of toes |
| 2. | Increase in the complexity of the molar teeth |
| 3. | Lengthening of the limbs in general |
| 4. | Enlargement of the brain |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
61%
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Which of the following is not a proposition of Lamarckism?
| 1. | Living organisms or their component parts tend continually to increase in size |
| 2. | Production of new organs results from a new need due to a change in the environment |
| 3. | If an organ is used constantly, it tends to get developed, whereas disuse results in degeneration |
| 4. | Modifications produced by the above mechanisms during the lifetime of an individual will not be inherited |
Subtopic: Theory of Evolution & Lamarckism |
76%
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Around 200 mya, some land reptiles went back to the water to evolve into fish-like reptiles, for example:
| 1. | Pareiasaurus | 2. | Pelycosaurus |
| 3. | Ichthyosaurs | 4. | Archosaurus |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
93%
From NCERT
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The loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population is called as:
| 1. | the bottleneck effect | 2. | the founder effect |
| 3. | assortative mating | 4. | random mating |
Subtopic: Hardy Weinberg Law | Sources of Variation |
61%
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The extinct reptilian lineage that evolved into dinosaurs and later on the birds is:
| 1. | Pelycosaurs | 2. | Synapsids |
| 3. | Tuataras | 4. | Thecodonts |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
54%
From NCERT
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Fishes with stout and strong fins that could move on land and go back to water existed about:
| 1. | 500 mya | 2. | 350 mya |
| 3. | 320 mya | 4. | 300 mya |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
69%
From NCERT
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According to the Darwinian concept of evolution, a giraffe has a long neck because:
| 1. | it was always like that since the beginning |
| 2. | during evolution the number of cervical vertebrae got increased |
| 3. | its ancestors stretched their necks to get food |
| 4. | ancestral giraffes with longer necks got more food and left more surviving offspring |
Subtopic: Theory of Evolution & Lamarckism | Darwin's Theory | Additional Theories of Darwin |
71%
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