Question

what is Vestigual Organ? write some examples!!!!!

Answer 1

A type of organ,they have lost , totally lost their original function. they are smaller and simpler than other organ.
Example:- vermiform appendix.- in human.

Answer 2

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Vestigial organs are commonly described as organs that are no longer used, and have therefore been reduced by evolution until they are mere remnants without function. Examples include things like eyes in blind cavefish.

However, this is a misunderstanding of vestigiality; or rather, it is only one particular case. There's no rule that says that a vestigial organ must be non-functional. All it means is that the organ is a vestige of some other structure that shows clearly that it used to have a different function, whether it is now functionless or has been exapted to serve a new function. For example: humans do not have tails, so our tailbones are clearly vestigial: they're precisely homologous to the bones at the base of the normal mammalian tail. But while we don't have a tail, the bones can still serve to anchor muscles. Or another example: the vermiform appendix is a vestigial organ, may be reduced vestige of the caecum, a pouch where herbivorous mammals have bacteria to break down cellulose; but the human appendix does have functions other than killing you, playing a role in the immune system. Boas and pythons have so-called pelvic spurs, tiny vestigial legs -- obviously no longer used for locomotion, but exapted to help clasp to the female during mating.

So a vestigial organ is simply an organ which can be clearly seen as a reduced and modified version of an ancestral organ, no longer serving the same purpose; it may or may not serve another purpose in its vestigial form.