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10th Class Science Solved Paper - Science-2015 Outside Delhi Set-I

  • question_answer
    Explain the following:
    (a) Speciation
    (b) Natural Selection                              

    Answer:

    (a) Specification is the evolution of a new species form pre-existing species. Occuring due to accumulation of variations. By processes like genetic drift, like mountains, rivers etc. leading to incapability to reproduce amongst themselves in population.
    (b) Natural selection
                (i) Change in frequency of some genes in a population
                (ii) It gives survival advantages to a species from elimination.


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