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Q. No.The ultimate source of allelic variations in a population is:
1. Recombination
2. Mutation
3. Genetic drift
4. Gene flow
Subtopic: Population Genetics |
56%
From NCERT
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Consider the given two statements:
| Assertion (A): | One-third of all indigenous inhabitants of Sub-Saharan Africa carry the allele of sickle cell trait. |
| Reason (R): | In areas where malaria is common, there is a survival value in carrying only a single sickle-cell allele (sickle cell trait). |
| 1. | Both (A) and (R) are True but the (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and the (R) correctly explains (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Genetic Basis of Adaptation |
76%
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The theory of spontaneous generation was conclusively disproved with careful experimentation by:
1. Louis Pasteur
2. Spallanzani
3. Francesco Redi
4. Miller and Urey
1. Louis Pasteur
2. Spallanzani
3. Francesco Redi
4. Miller and Urey
Subtopic: Origin of Life |
92%
From NCERT
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A sudden and large mutational change from one generation to the next, potentially causing single-step speciation is called as:
| 1. | Punctuated equilibrium | 2. | Saltation |
| 3. | Allopatric speciation | 4. | Sympatric speciation |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
98%
From NCERT
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Which lineage of the extinct reptiles directly led to the evolution of mammals?
1. Thecodonts
2. Pelycosaurs
3. Therapsids
4. Sauropsids
1. Thecodonts
2. Pelycosaurs
3. Therapsids
4. Sauropsids
Subtopic: Evolution Prior to Ape Man: 1 |
64%
From NCERT
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The unit of organic evolution will be:
1. An individual
2. A population
3. A biological community
4. A species
1. An individual
2. A population
3. A biological community
4. A species
Subtopic: Definition & Types of Evolution |
60%
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If we say that the embryos of reptiles, birds, and mammals look very similar during their early stages of development, this would suggest that these organisms:
1. have stopped evolving
2. have a common ancestor
3. live in the same types of environments
4. will get extinct if the environment changes
1. have stopped evolving
2. have a common ancestor
3. live in the same types of environments
4. will get extinct if the environment changes
Subtopic: Embryological Evidence of Evolution |
93%
From NCERT
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In 1938, a fish caught in South Africa which was thought to be extinct, was a:
| 1. | Jawless fish | 2. | Armoured fish |
| 3. | Lobe finned fish | 4. | Ray finned fish |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
74%
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Which of the following periods in geological time scale is not included in the Palaeozoic era?
1. Silurian
2. Cretaceous
3. Devonian
4. Carboniferous
1. Silurian
2. Cretaceous
3. Devonian
4. Carboniferous
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
74%
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Identify the correct statements:
| a. | Homology indicates common ancestry. |
| b. | Sweet potato and potato are examples for homology. |
| c. | Analogous structures are a result of convergent evolution. |
| d. | Vertebrate hearts or brains are analogous structures. |
| 1. | a and b only | 2. | c and d only |
| 3. | a and c only | 4. | b and d only |
Subtopic: Palentological Evidences of Evolution |
89%
From NCERT
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