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Q. No.Ichthyosaur was:
1. a marine retile
2. a marine amphibian
3. a fresh water amphibian
4. a flying reptile
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
56%
From NCERT
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Most common component of coal-forming ecosystems from the Carboniferous and Permian periods were:
1. Algae and protists
2. Ferns
3. Angisosperms
4. Animals
1. Algae and protists
2. Ferns
3. Angisosperms
4. Animals
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
79%
From NCERT
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How many of the given statements are correct regarding the timeline of evolution of different life forms on Earth?
1. 3
2. 4
3. 5
4. 6
| I: | By the time of 500 mya, invertebrates were formed and active. |
| II: | Jawless fish probably evolved around 350 mya. |
| III: | Sea weeds and few plants existed probably around 320 mya. |
| IV: | The first organisms that invaded land were plants. |
| V: | Lobefins evolved into the first amphibians. |
| VI: | The amphibians evolved into reptiles. |
1. 3
2. 4
3. 5
4. 6
Subtopic: Evolution Prior to Ape Man: 1 |
77%
From NCERT
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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 |
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 |
79%
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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