explain divergent evolution with an example of plants?

Divergent evolution means originwise common structure diverged towards different direction to perform different functions according to the need of organism.

Example- thorn of Bougainvillea and tendril of cucurbita. Thorns and tendrils both are axillary in position and are the modifications of axillary buds. But they both perform different functions as thorns are for protection and tendrils are for support.

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Divergent evolution means originwise common structure diverged towards different direction to perform different functions according to the need of organism.

Example- thorn of Bougainvillea and tendril of cucurbita. Thorns and tendrils both are axillary in position and are the modifications of axillary buds. But they both perform different functions as thorns are for protection and tendrils are for support
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The formation of dissimilar looking organisms from common ancestors is called divergent evolution. This is also known as adaptive radiation which represents evolution of new forms in several directions from the common ancestors type. The current example of such a process is the evolution of wild cabbage. For over more than 200 years, humans have cultivated wild cabbage as a food plant and generated different vegetables (like cabbage, broccoli, cauliflower, kohlrabi and kale etc) from it by different artificial selections. Thus all these structures of different vegetables are descended from the same ancestor i.e. wild cabbage.  
hope this helps you :-)
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divergent evlution is opposite of convergent evoolution
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The process of evolution in which members of same ancestral species of a large taxonomic group are evolved along different lines in different habitats of same geographical area. Homologous structures are result of divergent evolution.
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Divergent evolution simply means the structures which are common in origin i. e. Have same ancestors but functionally they are different For example - in man the forelimbs are used for grasping but in cheetah is used for running even though limbs of both have same origin but perform different functions according to their requirement
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