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Q. No.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
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| 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. |
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| 1. | 20 billion years back | 2. | 10 billion years back |
| 3. | 4.5 billion years back | 4. | 3.0 billion years back |
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| 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
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| 1. | Spallanzani | 2. | Francesco Redi |
| 3. | Louis Pasteur | 4. | van Helmont |
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| 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
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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
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