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Q. No.Consider the given two statements:
Assertion:
Unlike amphibians, reptiles were truly successful on land.
Reason:
Unlike amphibians, reptiles lay thick-shelled eggs which do not dry up in sun.
1.
(A) is false but (R) is true
2.
(A) is true but (R) is false
3.
Both (A) and (R) are true and (R) is the correct explanation of (A)
4.
Both (A) and (R) are true but (R) is not the correct explanation of (A)
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
78%
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In geological time scale, the correct sequence of periods [beginning with earliest] will be:
| 1. | Silurian → Devonian → Carboniferous → Permian |
| 2. | Permian → Devonian → Carboniferous → Silurian |
| 3. | Silurian → Carboniferous → Devonian → Permian |
| 4. | Permian → Carboniferous → Devonian → Silurian |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
73%
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Natural selection can lead to:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | stabilisation in which more individuals acquire mean character value |
| II: | directional change in which more individuals acquire value other than the mean character value |
| III: | disruption in which more individuals acquire peripheral character value at both ends of the distribution curve |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Natural Selection |
88%
From NCERT
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The loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population is called as:
1. Edge effect
2. Genetic bottleneck
3. Founder effect
4. Saltation
1. Edge effect
2. Genetic bottleneck
3. Founder effect
4. Saltation
Subtopic: Hardy Weinberg Law: 2 |
82%
From NCERT
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The frequency of the recessive allele for a trait is recorded to be 0.25 [Assume only two alleles for the gen and complete dominance]. What would the expected frequency of the heterozygotes in this population?
1. 0.0625
2. 0.5625
3. 0.375
4. 0.1875
1. 0.0625
2. 0.5625
3. 0.375
4. 0.1875
Subtopic: Hugo De Vries Theory of Evolution |
69%
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Hugo de Vries believed that:
| 1. | discontinuous variations due to mutations are important for evolution |
| 2. | continuous variations due to recombination are important for evolution |
| 3. | evolution is a function of time |
| 4. | evolution is a deterministic process |
Subtopic: Hugo De Vries Theory of Evolution |
80%
From NCERT
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It is possible that Darwin was influenced by the essay on populations by:
| 1. | Carl Correns | 2. | Charles Lyell |
| 3. | Thomas Malthus | 4. | A. R. Wallace |
Subtopic: Modern Theory of Evolution |
84%
From NCERT
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Consider the given two facts:
What inference(s) can be definitely drawn from the given facts?
A. there had been competition for resources
B. the best adapted survive the competition
1. Only A
2. Only B
3. Both A and B
4. Neither A nor B
| I: | Theoretically, population size will grow exponentially if everybody reproduced maximally |
| II: | Population sizes in reality are limited |
A. there had been competition for resources
B. the best adapted survive the competition
1. Only A
2. Only B
3. Both A and B
4. Neither A nor B
Subtopic: Population Genetics |
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“Giraffes, in an attempt to forage leaves on tall trees, had to adapt by elongation of their necks and they passed on this acquired character of elongated neck to succeeding generations” – this explanation of long necks can best be ascribed to:
| 1. | Charles Darwin | 2. | Lamarck |
| 3. | Hugo de Vries | 4. | Louis Pasteur |
Subtopic: Theory of Evolution & Lamarckism |
94%
From NCERT
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Consider the given two statements:
Assertion: Natural selection can be regarded as ‘differential reproduction’.
Reason: Nature selects for fitness.
Assertion: Natural selection can be regarded as ‘differential reproduction’.
Reason: Nature selects for fitness.
| 1. | Both Assertion and Reason are true and Reason correctly explains the Assertion. |
| 2. | Both Assertion and Reason are true but Reason does not correctly explain the Assertion. |
| 3. | Assertion is true but Reason is false. |
| 4. | Assertion is false but Reason is true. |
Subtopic: Natural Selection |
From NCERT
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