Question

The evolution of eye is an example of evolution by
A) Stages
B) Homologous
C) Both A and B
D) None of the above

Answer 1

Hint: It is believed that the eye was first formed in unicellular organisms about $540$ million a year ago. The complete evolution of the eye took place step by step and first eyespots were seen in the organisms which further started developing and changes took place in it and a complete eye was formed.

Complete answer:
Option A Stages: You know that evolutionary change in organisms occurs with time and modification in structure and function of the eye is the evolutionary change which occurs with time. The eye structure of the primitive organisms were small and used to lack ability to sense the light intensity, but later on a complex structure of the eye was developed which have photosensitive cells. This development of the eye took place in stages over several years of time.
So, option A is correct.
Option B Homologous: Homologous organs are the organs of the animals which are similar in structure but differ in their function. For example flippers of seal and wings of bat, you must be knowing that both these organs are similar in structure but their function is not similar. Seals use their flippers to swim while bats use their wings to fly.
So, option B is not correct.
Option C Both A and B: You know that development of any organ or part of the organism takes place in stages, as we humans took several years to develop our brain and this development took place in stages. Homologous organs are the organs of the animals which are similar in structure but differ in their function. So, here we can conclude that both cannot be true.
So, Option C is not correct.
Option D None of these: We know that development of any organ of an organism takes place in stages and it occurs with time.
So, option D is not correct.

So Option A is the correct answer.

Note:
Evolutionary changes is the change which is seen in the inherited trait in all the population of the organism and this change in genetics is transferred from one generation to another. This changes occurs due to several factors like mutation, natural selection, genetic drift and migration.