Q. No.Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Both statement I and statement II are correct
2. Both statement I and statement II are incorrect
3. Statement I is correct but statement II is incorrect
4. Statement I is incorrect but statement II is correct
| Statement I: | Mutations are random and direction less, while Darwinian variations are small and directional. |
| Statement II: | Darwin's finches represent one of the best examples of adaptive radiation. |
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Both statement I and statement II are correct
2. Both statement I and statement II are incorrect
3. Statement I is correct but statement II is incorrect
4. Statement I is incorrect but statement II is correct
Subtopic: Â Darwin's Theory |Â Hugo De Vries Theory of Evolution |
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Read the following statements carefully about natural selection
A. Any population has built-in variations in characteristics and adaptive ability is inherited
B. Adaptive ability has a genetic basis
C. Fitness is the end result of the ability to adapt and get selected by nature
D. The rate of appearance of new forms is linked to the life-cycle or the life span
E. We cannot treat evolution as consequence of a process called natural selection
1. Only statements A, B and C are correct
2. Only statements B, C and D are correct
3. Statements A, B, C and D are correct
4. Statements C, D and E are correct
A. Any population has built-in variations in characteristics and adaptive ability is inherited
B. Adaptive ability has a genetic basis
C. Fitness is the end result of the ability to adapt and get selected by nature
D. The rate of appearance of new forms is linked to the life-cycle or the life span
E. We cannot treat evolution as consequence of a process called natural selection
1. Only statements A, B and C are correct
2. Only statements B, C and D are correct
3. Statements A, B, C and D are correct
4. Statements C, D and E are correct
Subtopic: Â Darwin's Theory |
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| Assertion (A): | In terms of determination, evolution is a directed process |
| Reason (R): | Nature selects those variants which are able to reproduce better and leave more progeny in the changed environmental conditions |
Choose the correct answer from the options given below
| 1. | (A) is true but (R) is false |
| 2. | (A) is false but (R) is true |
| 3. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
| 4. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
Subtopic: Â Darwin's Theory |
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Match the scientists listed in column-I with their ideas listed in column-II and select the correct option
1. a(iii), b(ii), c(i), d(iv)
2. a(i), b(ii), c(iii), d(iv)
3. a(ii), b(iii), c(i), d(iv)
4. a(iii), b(ii), c(iv), d(i)
| Column-I | Column-II | ||
| a. | Lamarck | (i) | Origin of life preceded by chemical evolution |
| b. | Darwin | (ii) | Reproductive fitness |
| c. | Haldane | (iii) | Inheritance of acquired characters |
| d. | Malthus | (iv) | Populations are stable in size except for the seasonal fluctuations |
1. a(iii), b(ii), c(i), d(iv)
2. a(i), b(ii), c(iii), d(iv)
3. a(ii), b(iii), c(i), d(iv)
4. a(iii), b(ii), c(iv), d(i)
Subtopic: Â Examples of Chemical Evolution |Â Other Theories of Origin of Life |Â Theory of Evolution & Lamarckism |Â Darwin's Theory |Â Modern Theory of Evolution |
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Match column I with column II and choose the correct option
1. a(ii), b(i), c(iii)
2. a(iv), b(i), c(iii)
3. a(ii), b(iii), c(i)
4. a(ii), b(iv), c(iii)
| Column I | Column II | ||
| a. | Saltation | (i) | Lamarck |
| b. | Inheritance of acquired characters | (ii) | Hugo de Vries |
| c. | Branching descent and natural selection | (iii) | Darwin |
| (iv) | Thomas Malthus |
1. a(ii), b(i), c(iii)
2. a(iv), b(i), c(iii)
3. a(ii), b(iii), c(i)
4. a(ii), b(iv), c(iii)
Subtopic: Â Theory of Evolution & Lamarckism |Â Darwin's Theory |Â Hugo De Vries Theory of Evolution |
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Which of the following refers to correct example(s) of organisms that have evolved due to changes in environment brought about by anthropogenic action?
(a) Darwin's Finches of Galapagos islands
(b) Herbicide-resistant weeds
(c) Drug-resistant eukaryotes
(d) Man-created breeds of domesticated animals like dogs
1. (a) and (c)
2. (b), (c) and (d)
3. only (d)
4. only (a)
Subtopic: Â Darwin's Theory |Â Concept of Organic Evolution: Evidence |
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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 |
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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.
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: Â Darwin's Theory |Â Genetic Basis of Adaptation |
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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 |
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