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Q. No.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
Subtopic: Darwin's Theory |
76%
Level 2: 60%+
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Read the following statements A and B with respect to evolution. Select the correct option.
| Statement A: | Evolution is not a directed process in the sense of determination. |
| Statement B: | It is a stochastic process based on chance events in nature and chance mutation in organisms. |
| 1. | Both statements A and B are incorrect. |
| 2. | Both statements A and B are correct. |
| 3. | Only statement A is incorrect. |
| 4. | Only statement B is incorrect. |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
89%
Level 1: 80%+
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| Assertion(A): | Coacervates are believed to be the precursors of life. |
| Reason(R): | Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules. |
| 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: Origin of Life: Chemical Evolution: 1 | Origin of Life: Chemical Evolution: 2 | Other Theories of Origin of Life | Origin of Life |
Level 3: 35%-60%
Hints
| Assertion(A): | The earliest organisms that appeared on earth were non-green and presumably anaerobes. |
| Reason(R): | The first autotrophic organisms were the chemoautotrophs that never released oxygen. |
| 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 |
63%
Level 2: 60%+
Hints
| 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: Concept of Organic Evolution: Evidence: 1 | Concept of Organic Evolution: Evidence: 2 | Concept of Organic Evolution: Evidence: 3 | Darwin's Theory | Summary of Darwin's Theory | Additional Theories of Darwin |
54%
Level 3: 35%-60%
Hints
| Assertion(A): | Human ancestors never used their tails so that tail expression gene has disappeared in them. |
| Reason(R): | Lamarck's theory of evolution is popularly called theory of continuity of germplasm. |
| 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 |
Level 3: 35%-60%
Hints
| Assertion(A): | Gene flow increases genetic variations. |
| Reason(R): | Random introduction of new alleles into recipient population and their removal from donor population affect allele frequency. |
| 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: Hardy Weinberg Law: 1 | Hardy Weinberg Law: 2 | Hardy Weinberg Law |
67%
Level 2: 60%+
Hints
| Assertion(A): | Among primates, chimpanzee is closest relative to the present day humans. |
| Reason(R): | The banding pattern of autosomes 3 and 6 of humans and chimapanzee is remarkably similar. |
| 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 | Classification of Primates | Evolution Prior to Ape Man: 1 | Evolution Prior to Ape Man: 2 | Evolution of Homo Sapiens |
80%
Level 1: 80%+
Hints
| Assertion(A): | From evolutionary point of view, human gestation period is believed to be shortening. |
| Reason(R): | One major evolutionary trend in humans has been the larger head undergoing relatively faster growth in the foetal stage. |
| 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 | Classification of Primates | Evolution of Homo Sapiens |
Level 3: 35%-60%
Hints
| 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: Darwin's Theory | Summary of Darwin's Theory | Drawbacks of Darwin's Theory |
51%
Level 3: 35%-60%
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