insects, octopus, planarian and vertebrates possess eyes.
can we group these animals together on the basis of eyes that they possess?
justify the answer giving reason.
Answers
Answer:
Development of eye is not a point utilized in classification rather it is an important feature in the evolution.
*Evolution of eye was not successfully explained by Darwin. It is the assumption made by the scientists that first eye-like structure could have been a light sensitive spot on the skin. This could have gone through many changes and complexities to form human eye.
*There was a simplest light-sensitive spot on the skin in ancestral organisms.
*Random changes created a depression in the light sensitive patch making the vision sharper.in animals like planarians
*In insects, the light-sensitive spot gradually evolved into special layer with structures like ommatidia.
*Later, over a period of time, lens was formed in front of the eye.
*Vertebrates and octopuses developed the eye resembling a pin-hole camera. Nerve fibres pass infront of the retina. Cephalopods have an eyes in which nerves are attached to the retina. They do not have a blind spot. Blind spot is present in the retina of the vertebrate eye whereas blind spot is absent in the octopus eye.
*Human eye is a complex structure made up of different structures which individually are incapable of vision. Altogether, the lens, the pupil, the iris and the retina make the vision possible.
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