we see eyes of planaria ,insects, octopus and vertebrates .can be grouped together in case of tje above mention animals to estabilsh a common evolutionary origin ? why
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Development of eye is not a point utilised 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 animls 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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Your answer is
Development of eye is not a point utilised 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 animls 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.
Its Lovv roy
I think this will help u ;)
Mark as brainlist
#$%&$@$&*$##%&*%#%*--$##&*--$#$&*-$#$&
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Evolutionary origin
Explanation:
- Planaria, insects, octopus and vertebrates all have eyes
- Though, the eyes in Planaria, insects, octopus and vertebrates vary greatly in their structure
- 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 a highly specialized eye
- Only presence of eyes cannot be considered as a criteria to group together these animals or establish common evolutionary origin
- A lot of other characteristics like cellular organisation, the complexity of body structure, the presence of notochord etc. are used for the purpose of grouping organisms together
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