Question

Formation of rudimentary eyes shows the evolution in an organism is
A. Primary stage of evolution
B. Intermediate stage of evolution
C. Final stage of evolution
D. None of the above

Answer 1

Hint:-Evolution is a slow and gradual process that takes millions of years for a character to get evolved. The evolution in organisms occurs due to various activities like deletion, insertion of a base pair. It may also occur due to some inheritable mutations. The transformed genes are passed on from one generation to another so that successful evolution can take place.

Complete Answer:-
The rudimentary organs are those organs which have developed after a long period of evolution and have led to their loss to show their basic significance which was present in the first species. The rudimentary organs develop during the embryonic development and can be completely formed or may remain undeveloped due to some reasons. The formation of the rudimentary eye is considered as an intermediate stage of evolution.
The rudimentary eyes are considered as the undeveloped and the underdeveloped eyes of some organisms. These organisms include planaria which had eye spots present in the form of rudimentary eyes. Over time the random changes helped them to make their vision sharper. These eyespots were present in a more developed form in the insects as they had the presence of the special structures called ommatidia.
The more developed eyes structures were formed in the vertebrates as they have the presence of a lens in front of the eyes. The eye design from simple has undergone many changes to form the complex eye structure of the present humans.

So, the answer is option B, ‘intermediate stage of evolution’.

Note:- The evolution of the eye structure occurred over a long period. It has led to the simple eye spot developing into a complex eye structure present in humans. The complex structure provides better visual quality than the simple structure.