Select Chapter Topics:
Q. No.
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.
Subtopic: Other Theories of Origin of Life | A BRIEF ACCOUNT OF EVOLUTION |
83%
Level 1: 80%+
Hints
| 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. |
Subtopic: Theory of Evolution & Lamarckism | Modern Theory of Evolution | Natural Selection | Genetic Basis of Adaptation |
81%
Level 1: 80%+
Hints
| 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: 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%
Level 2: 60%+
Hints
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 |
88%
Level 1: 80%+
Hints
| 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. |
Subtopic: Introduction to Human Evolution | Evolution Prior to Ape Man: 1 | Evolution Prior to Ape Man: 2 | Evolution of Homo Sapiens |
55%
Level 3: 35%-60%
Hints
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: 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 |
75%
Level 2: 60%+
Hints
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 |
67%
Level 2: 60%+
Hints
| Assertion (A): | Big bang theory says that the universe is still expanding. |
| Reason (R): | The expansion of the universe caused the decrease in temperature. |
| 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: Cosmic Evolution |
55%
Level 3: 35%-60%
Hints
| 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: Darwin's Theory | Summary of Darwin's Theory | Modern Theory of Evolution |
89%
Level 1: 80%+
Hints
| Assertion (A): | The new forms of life have arisen at different times in the history of the earth. |
| Reason (R): | Studies showed that life forms varied over time and certain life forms are restricted to certain geological timespans. |
| 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: Concept of Organic Evolution: Evidence |
51%
Level 3: 35%-60%
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