What is an organic evolution? It cannot be equated with progress. Explain with the help of a suitable example.
CBSE OUTSIDE DELHI - SET 3 2017
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A sequence of gradual changes which take place in the organism over millions of years resulting in the formation of new organisms/species.
Evolution is not progress from lower form of life to higher. It has given rise to more complex body design even while simpler body designs continue to flourish.
You may take an example of human beings who have not evolved from chimpanzees, but both have common ancestors.
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List any two modes of asexual reproduction in animals. Under which mode of reproduction is vegetative propagation placed and why? List two advantages of vegetative propagation.
Name the two types of mammalian gametes. How are these different from each other? Name the type of reproduction they are involved in. Write the advantage of this type of reproduction.