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Q. No.Assertion(A): Natural selection is the outcome of difference in survival and reproduction among individual that have shown variation in one or more traits.
Reason(R): Adaptive forms of a given trait to become more common. Less adaptive ones become less common or disappear.
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): Adaptive forms of a given trait to become more common. Less adaptive ones become less common or disappear.
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: Â Concept of Organic Evolution: Evidence: 1 |Â Concept of Organic Evolution: Evidence: 2 |Â Concept of Organic Evolution: Evidence: 3 |Â Darwin's Theory |Â Summary of Darwin's Theory |Â Additional Theories of Darwin |
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Assertion(A): Fitness is the end result of ability to adapt and get selected by nature.
Reason(R): Some organisms are better adapted to survive in an otherwise hostile environment.
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): Some organisms are better adapted to survive in an otherwise hostile environment.
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: Â Darwin's Theory |Â Summary of Darwin's Theory |Â Drawbacks of Darwin's Theory |
 53%
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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: Â Darwin's Theory |Â Summary of Darwin's Theory |Â Drawbacks of Darwin's Theory |Â Hardy Weinberg Law: 1 |Â Hardy Weinberg Law: 2 |Â Hardy Weinberg Law |
 75%
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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: Â Examples of Chemical Evolution |Â Darwin's Theory |Â Summary of Darwin's Theory |Â Hardy Weinberg Law: 1 |Â Hardy Weinberg Law: 2 |Â A BRIEF ACCOUNT OF EVOLUTION |
 71%
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Assertion (A): According to Darwin, fitness means reproductive fitness.
Reason (R): Those who are a better fit in the environment will leave more progenies.
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): Those who are a better fit in the environment will leave more progenies.
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: Â Darwin's Theory |Â Summary of Darwin's Theory |Â Modern Theory of Evolution |
 86%
From NCERT
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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.
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: Â Theory of Evolution & Lamarckism |Â Darwin's Theory |Â Summary of Darwin's Theory |Â Modern Theory of Evolution |
 83%
From NCERT
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Q. No.
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