15. (i) Planaria, insects, octopus and
vertebrates all have eyes. Can we
group eyes of these animals
together to establish a common
evolutionary origin? Justify your . answer. (ii) "Birds have evolved from
reptiles" State evidence to prove the
statement.
Answers
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Planaria, insects, octopus and vertebrates all have eyes. ... These organisms can be used for studying the evolution of eyes as the eye of Planaria is simple without a lens, insects have compound eyes and vertebrates have highly specialised eyes; however, all of them perform the same function that is a vision.
The function of feathers initially was to provide insulation but later on they became useful for flight in birds only. Similarly, some dinosaurs had feathers, although they could not fly using the feathers. Birds seem to have later adapted the feathers to flight. This, of course, means that birds are very closely related to reptiles, since dinosaurs were reptiles.
(b) The structure of the eye in each of these organisms is different. This indicates that, these organisms have separate evolutionary origins.
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