Question
Differentiate between primary and secondary succession.
| S.No. | Primary Succession | Secondary Succession |
| (i) | The ecological succession that takes place in a place, where no life existed before, is called primary succession. | The ecological that takes place in a region where life existed in the past but got wiped out completely is called secondary succession. |
| (ii) | It is comparatively slow as suitable soil has to be formed. | It is comparatively faster as soil or sediment is already present. |
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| S. No. | Name of the drug | Plant source | Organ system affected |
| (i) | a | Poppy plant | b |
| (ii) | Marijuana | c | d |
OR
How is mutation explained by Hugo de Vries different from the Darwinian variations?OR
How do Darwin and de Vries differ in their views on the mechanism of evolution of life on earth?