explain evolution by stages of pg 155 Related: Short and Long Answer Question, Chapter 9 - Heredity and Evolution, Science, Class 10

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explain evolution by stages of pg 155 Related: Short & Long Answer Qu...

Evolution by stages is said because the process of evolution had took place over a long period of time. The complex organs are created bit-by bitover generations.

Increasing complexity of organs:

The eye was present in the earliest organisms in the form of a simple patch of photosensitive cells called an eyespot. This was found in lower organisms such as Euglena.

Decreasing complexity of organs:

There are some organs in the human body, which are present in the reduced form and do not perform any function. For example, the nictitating membrane of the eye, third pair of molars, vermiform appendix, body hair, nipples in males etc.

Changed functions of organ:

Some structures during the course of evolution changed their functions. For example, some past reptiles (which later evolved into bird ancestors) would have had feathers, which were not necessarily used for flying, but instead only provided them with protection.

These are certain stages of evolution.

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