1. | 15 mya | 2. | 20 mya |
3. | 25 mya | 4. | 30 mya |
1. | Western Africa | 2. | Eastern African grasslands |
3. | South America | 4. | South East Asia |
1. | Homo habilis | 2. | Homo erectus |
3. | Homo ergaster | 4. | Homo neanderthelensis |
1. | Tanzania; 2 | 2. | Java; 1.5 |
3. | Ethiopia; 1.5 | 4. | Australia; 2 |
1. | 450 cc | 2. | 700 cc |
3. | 900 cc | 4. | 1000 cc |
1. | Cranial capacity of around 1400 cc |
2. | Lived in East and Central Africa |
3. | Used hides to protect their bodies |
4. | Buried their dead |
1. | Neanderthals lived between 1,50,000 and 1,00,000 years back. |
2. | Modern Homo sapiens arose between 75000 and 10000 years ago. |
3. | Pre-historic cave art developed around 18000 years ago. |
4. | Agriculture came around 10000 years ago |
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. |
1. | 20 billion years back | 2. | 10 billion years back |
3. | 4.5 billion years back | 4. | 3.0 billion years back |
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. |