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Q. No.Assertion(A): Sickle cell anaemia in malaria endemic area is an example of directional selection.
Reason(R): Individuals for sickle cell anaemia have defective gene in X chromosomes.
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. Both (A) and (R) are false.
Subtopic: Darwin's Theory | Genetic Basis of Adaptation |
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Assertion(A): Australian marsupials can be taken as an example of adaptive radiation.
Reason(R): A number of marsupials, evolved from an ancestral stock, but all within the Australian island continent.
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. Both (A) and (R) are false.
Reason(R): A number of marsupials, evolved from an ancestral stock, but all within the Australian island continent.
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. Both (A) and (R) are false.
Subtopic: Theory of Evolution & Lamarckism | Modern Theory of Evolution | Genetic Basis of Adaptation |
76%
From NCERT
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Assertion(A): Analogous structures are a result of convergent evolution.
Reason(R): Different structures evolving for the same function and hence having similarity.
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. Both (A) and (R) are false.
Reason(R): Different structures evolving for the same function and hence having similarity.
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. Both (A) and (R) are false.
Subtopic: Concept of Organic Evolution: Evidence: 1 | Concept of Organic Evolution: Evidence: 2 | Concept of Organic Evolution: Evidence: 3 | Modern Theory of Evolution |
90%
From NCERT
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Assertion(A): Evolution is not occurring at all at present.
Reason(R): Evolution takes a very short time.
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. Both (A) and (R) are false.
Reason(R): Evolution takes a very short time.
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. Both (A) and (R) are false.
Subtopic: Other Theories of Origin of Life | A BRIEF ACCOUNT OF EVOLUTION |
82%
From NCERT
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Assertion(A): Evolution is not a directed process in the sense of determination.
Reason(R): It is stochastic process based on chance events in nature and chance mutation in the organisms.
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. Both (A) and (R) are false.
Reason(R): It is stochastic process based on chance events in nature and chance mutation in the organisms.
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. Both (A) and (R) are false.
Subtopic: Theory of Evolution & Lamarckism | Modern Theory of Evolution | Natural Selection | Genetic Basis of Adaptation |
77%
From NCERT
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Assertion(A): Branching descent and natural selection are the two key concepts of Darwinian theory.
Reason(R): Hardy-Weinberg's equilibrium is not affected by Darwinian natural selection.
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. Both (A) and (R) are false.
Reason(R): Hardy-Weinberg's equilibrium is not affected by Darwinian natural selection.
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. Both (A) and (R) are false.
Subtopic: Darwin's Theory | Summary of Darwin's Theory | Drawbacks of Darwin's Theory | Hardy Weinberg Law: 1 | Hardy Weinberg Law: 2 | Hardy Weinberg Law |
75%
From NCERT
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Assertion(A): Continental drift caused survival of pouched mammals of Australia.
Reason(R): It was due to lack of competition from any other mammal.
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. Both (A) and (R) are false.
Reason(R): It was due to lack of competition from any other mammal.
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. Both (A) and (R) are false.
Subtopic: Definition & Types of Evolution | Concept of Speciation |
87%
From NCERT
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Assertion(A): Human beings possess the property of language skills and self-consciousness.
Reason(R): Chimpanzee are also animals with the property of self-consciousness.
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. Both (A) and (R) are false.
Reason(R): Chimpanzee are also animals with the property of self-consciousness.
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. Both (A) and (R) are false.
Subtopic: Introduction to Human Evolution | Evolution Prior to Ape Man: 1 | Evolution Prior to Ape Man: 2 | Evolution of Homo Sapiens |
53%
From NCERT
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Read the following statements :
(i) Diversifying (disruptive) selection is a mode of natural selection that favours variants of opposite extremes over intermediate forms
(ii) In the evolution of life on Earth, the early primitive cells that were present must have obtained their energy by glycolysis and fermentation
(iii) Darwin's theory of evolution was highly influenced by the Mendel's crossing experiments with peas
(iv) Hardy-Weinberg's principle can be used to interpret whether evolution has occurred in a population or not
(v) The half-life of carbon-14 is approximately 5730 years
Which of the above statements are correct?
1. (i), (ii)
2. (iii), (iv)
3. (ii), (iii), (iv), (v)
4. (i), (ii), (iv), (v)
(i) Diversifying (disruptive) selection is a mode of natural selection that favours variants of opposite extremes over intermediate forms
(ii) In the evolution of life on Earth, the early primitive cells that were present must have obtained their energy by glycolysis and fermentation
(iii) Darwin's theory of evolution was highly influenced by the Mendel's crossing experiments with peas
(iv) Hardy-Weinberg's principle can be used to interpret whether evolution has occurred in a population or not
(v) The half-life of carbon-14 is approximately 5730 years
Which of the above statements are correct?
1. (i), (ii)
2. (iii), (iv)
3. (ii), (iii), (iv), (v)
4. (i), (ii), (iv), (v)
Subtopic: Examples of Chemical Evolution | Darwin's Theory | Summary of Darwin's Theory | Hardy Weinberg Law: 1 | Hardy Weinberg Law: 2 | A BRIEF ACCOUNT OF EVOLUTION |
71%
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Which of the following is appropriately related to genetic drift phenomenon?
I. Chance occurrence
II. Directional
III. Random change in allele frequency
IV. Fixation or elimination of alleles
1. I, II, III, IV
2. I, III, IV
3. III and IV only
4. I and II only
I. Chance occurrence
II. Directional
III. Random change in allele frequency
IV. Fixation or elimination of alleles
1. I, II, III, IV
2. I, III, IV
3. III and IV only
4. I and II only
Subtopic: Hardy Weinberg Law: 1 | Hardy Weinberg Law: 2 |
65%
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