- 1(current)
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. |
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 |
 56%
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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. |
Subtopic: Â Darwin's Theory |Â Summary of Darwin's Theory |Â Drawbacks of Darwin's Theory |
 52%
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. |
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%
From NCERT
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Read the following statements :
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 |
 74%
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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. |
Subtopic: Â Darwin's Theory |Â Summary of Darwin's Theory |Â Modern Theory of Evolution |
 88%
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. |
Subtopic: Â Theory of Evolution & Lamarckism |Â Darwin's Theory |Â Summary of Darwin's Theory |Â Modern Theory of Evolution |
 84%
From NCERT
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- 1(current)
Q. No.
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