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Chapter 1: Evolution


Evolutionary biology is the study of history of life forms on the Earth. To understand the evolution in flora and fauna over a period of millions of years on the earth, we must understand the origin of the beginning with the evolution of the earth, of stars, and the universe itself. Origin of life is believed to be a unique event in the history of universe. The Big Bang Theory attempts to explain to us the again of universe.

Chapter Analysis:

A lot of questions have been asked in the past two papers from this chapter with 4 in the later one and 3 in the former one. However, in 2017, no questions were asked. Also, in 2013 and 2012, 4 questions were asked in both the year. A total of 26 questions were asked in the past 11 years. So, we can atleast expect 2-4 questions in the coming years.
The below given graph illustrates the number of questions asked from this chapter in the previous years:

Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Number 1 1 1 4 4 2 1 3 0 3 4

The important topics to cover from this chapter are:
• Biological Evolution and Evidences for Biological Evolution
• Darwin’s Contribution
• Mechanisms of Evolution – Variation and Natural Selection with examples and types of natural selection.
• Gene Flow and Genetic Drift
• Hardy-Weinberg’s Principle