- 1(current)
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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
| 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. |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
| 1. | 20 billion years back | 2. | 10 billion years back |
| 3. | 4.5 billion years back | 4. | 3.0 billion years back |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
| 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 others. |
| IV. | As it cooled, the water vapour fell as rain, to fill all the depressions and form 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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
| 1. | Spallanzani | 2. | Francesco Redi |
| 3. | Louis Pasteur | 4. | van Helmont |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
| 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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
- 1(current)
Q. No.
© 2024 GoodEd Technologies Pvt. Ltd.