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Q. No.
Assertion (A): As per Darwin, over many generations, survivors will leave more progenies.
Reason (R): Survivors have variations that make resource utilization better for them.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Theory of Evolution & Lamarckism | Darwin's Theory | Summary of Darwin's Theory | Modern Theory of Evolution |
84%
From NCERT
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Assertion (A): deVries believed that mutation caused speciation.
Reason (R): The mutation causing speciation is known as saltation as per Darwin.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason (R): The mutation causing speciation is known as saltation as per Darwin.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Genetic Basis of Adaptation |
77%
From NCERT
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| Assertion (A): | The probability of genotype Aa is 2pq in the Hardy-Weinberg population. |
| Reason (R): | Hardy-Weinberg equilibrium, p2 +2pq+q2=1. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: Hardy Weinberg Law |
54%
From NCERT
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| Assertion (A): | Habitat fragmentation and genetic drift ultimately result in evolution. |
| Reason (R): | These phenomena accentuate variations that lead to speciation. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: Introduction to Human Evolution |
76%
From NCERT
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| Assertion (A): | Pouched mammals of Australia survived after continental drift. |
| Reason (R): | There was a lack of competition from any other placental mammals. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
87%
From NCERT
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Which of the following is not true for Homo erectus?
| 1. | Fossils discovered in Java |
| 2. | Lived about 1.5 mya |
| 3. | Had a large brain around 900cc |
| 4. | Probably, did not eat meat |
Subtopic: Introduction to Human Evolution | Evolution of Homo Sapiens |
80%
From NCERT
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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
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 |
72%
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 |
76%
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% |
Subtopic: Hardy Weinberg Law |
83%
From NCERT
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