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Chapter: Digestion And Absorption


The branch of biology which deals with the study of life processes is called Human Physiology. Major human physiological processes are digestion and absorption. Food is the substance used for growth, maintenance and activities of an organism and it is a mixture of nutritive and nonnutritive substances. The nutrients are the chemical substances present in food. The physiological activity by which organisms obtain food from their environment is called nutrition. Major components of food are carbohydrates, fats, proteins, minerals and vitamins. Water prevents dehydration of the body and plays an important role in metabolic processes.

Chapter Analysis:

This is one of the toughest chapters from Zoology in the NEET syllabus, and it exhibits in a way that a lot of questions have been asked from this chapter. All in all, 21 questions have been asked with 2 questions appearing in the last paper. 4 questions were asked in the year 2013. So, we can expect atleast 2-3 questions from this chapter in the coming years.
The below given graph illustrates the frequency of question coming from this chapter:

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

The important topics to cover from this chapter are:
• Alimentary Canal and Digestive Glands
• Role of digestive enzymes and gastrointestinal hormones
• Digestion, Absorption and Assimilation of Proteins, Carbohydrates and Fats.
• Calorific values of Proteins, Carbohydrates and Fats
• Nutritional Disorders like PEM, Indigestion, Constipation, Vomiting, Jaundice & Diarrhea