- 1(current)
Q. No.Evolutionary biology
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | is the subfield of biology that studies the evolutionary processes (natural selection, common descent, speciation) that produced the diversity of life on Earth. |
| II: | is also defined as the study of the history of life forms on Earth. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Origin of Life | A BRIEF ACCOUNT OF EVOLUTION |
91%
Level 1: 80%+
Hints
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | When we look at stars on a clear night sky we are, in a way, looking back in time. |
| Reason (R): | When we see objects in our immediate surroundings we see them instantly and hence in the present 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. | (A) is False but (R) is True. |
Subtopic: Origin of Life |
76%
Level 2: 60%+
Hints
In the solar system of the milky-way galaxy, the earth was supposed to have been formed about:
| 1. | 20 billion years back | 2. | 10 billion years back |
| 3. | 4.5 billion years back | 4. | 3.0 billion years back |
Subtopic: Origin of Life |
81%
Level 1: 80%+
Hints
Given the following statements about activities in the early earth:
Select the correct statements:
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. All are correct
| I: | Water vapour, methane, carbon dioxide, and ammonia released from molten mass covered the surface. |
| II: | The UV rays from the sun broke up water into Hydrogen and Oxygen and the lighter H2 escaped. |
| III: | Oxygen combined with ammonia and methane to form water, CO2, and other gases. |
| IV: | As it cooled, the water vapour fell as rain, filling all the depressions and forming oceans. |
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. All are correct
Subtopic: Origin of Life |
82%
Level 1: 80%+
Hints
The figure shows an experiment that demonstrated that life comes only from pre-existing life. This experiment was conducted by:
1. Spallanzani
2. Francesco Redi
3. Louis Pasteur
4. van Helmont
1. Spallanzani
2. Francesco Redi
3. Louis Pasteur
4. van Helmont
Subtopic: Origin of Life |
95%
Level 1: 80%+
Hints
Oparin of Russia and Haldane of England proposed that:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | The first form of life could have come from pre-existing non-living organic molecules (e.g. RNA, protein, etc.) |
| II: | The formation of life was preceded by chemical evolution, i.e., the formation of diverse organic molecules from inorganic constituents. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Origin of Life |
88%
Level 1: 80%+
Hints
Given below is the diagrammatic representation of Miller’s experiment where ‘X’ represents the gases used in the experiment. Identify the correct combination of the gases used by Miller in his experiment from the options given:
| 1. | Methane, Carbon dioxide, Oxygen, and Hydrogen |
| 2. | Methane, Ammonia, Water vapour, and Hydrogen |
| 3. | Hydrogen cyanide, Carbon dioxide, Ammonia, and Hydrogen |
| 4. | Hydrogen sulphide, Ammonia, Oxygen, and Hydrogen |
Subtopic: Origin of Life |
94%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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