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Q. No.What, according to Lamarck, is the reason for the especially long neck seen in giraffes?
| 1. | Ancestral giraffes with longer necks got more food and left more surviving offspring. |
| 2. | Ancestral giraffes stretched their necks to get food. |
| 3. | It was a divine creation. |
| 4. | The giraffe is the mammal where the number of cervical vertebrae is much more than the number of cervical vertebrae in other mammals. |
Subtopic: Theory of Evolution & Lamarckism | Biological Evolution |
82%
From NCERT
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The theory of spontaneous generation was conclusively disproved with careful experimentation by:
1. Louis Pasteur
2. Spallanzani
3. Francesco Redi
4. Miller and Urey
1. Louis Pasteur
2. Spallanzani
3. Francesco Redi
4. Miller and Urey
Subtopic: Origin of Life |
92%
From NCERT
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Evolution of life shows that life forms had a trend of moving from:
1. land to water
2. dry land to wet land
3. fresh water to sea water
4. water to land
1. land to water
2. dry land to wet land
3. fresh water to sea water
4. water to land
Subtopic: Origin of Life | A BRIEF ACCOUNT OF EVOLUTION |
94%
From NCERT
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Consider the given two statements:
| Assertion (A): | One-third of all indigenous inhabitants of Sub-Saharan Africa carry the allele of sickle cell trait. |
| Reason (R): | In areas where malaria is common, there is a survival value in carrying only a single sickle-cell allele (sickle cell trait). |
| 1. | Both (A) and (R) are True but the (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and the (R) correctly explains (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Genetic Basis of Adaptation |
76%
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In evolutionary terms, variations due to mutations are:
1. random and directionless
2. random and directional
3. small and directional
4. random, small and directional
1. random and directionless
2. random and directional
3. small and directional
4. random, small and directional
Subtopic: Hugo De Vries Theory of Evolution | Mechanism of Evolution |
78%
From NCERT
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What conditions of the primeval earth, as proposed by Oparin, were simulated in his experiment by S. L. Miller in 1953?
| 1. | low temperature, volcanic storms, atmosphere rich in oxygen |
| 2. | low temperature, volcanic storms, reducing atmosphere |
| 3. | high temperature, volcanic storms, non-reducing atmosphere |
| 4. | high temperature, volcanic storms, reducing atmosphere containing CH4, NH3 etc. |
Subtopic: Origin of Life |
92%
From NCERT
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Consider the given two statements:
| Assertion (A): | Almost all fossils are preserved in sedimentary rock. |
| Reason (R): | Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. |
| 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: Palentological Evidences of Evolution |
From NCERT
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About 65 mya, the dinosaurs suddenly disappeared from the earth. The reason for their sudden disappearance may be:
1. Only (a)
2. Only (b)
3. The truth may live in between (a) and (b).
4. Neither (a) nor (b).
| (a) | Climatic changes killed them. |
| (b) | Most of them evolved into birds. |
1. Only (a)
2. Only (b)
3. The truth may live in between (a) and (b).
4. Neither (a) nor (b).
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
85%
From NCERT
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A sudden and large mutational change from one generation to the next, potentially causing single-step speciation is called as:
| 1. | Punctuated equilibrium | 2. | Saltation |
| 3. | Allopatric speciation | 4. | Sympatric speciation |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
98%
From NCERT
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Consider the given two statements:
| Assertion (A): | Evolution by natural selection, in a True sense would have started when cellular forms of life with differences in metabolic capability originated on earth. |
| Reason (R): | Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
| 4. | (A) is False but (R) is True |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
From NCERT
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