NCERT Grade 8 Science Chapter 2, Microorganisms: Friend and Foe deals with harmful and useful types of microbes and their importance in various areas. Where do Microorganisms Live? Microorganisms and Us, Harmful Microorganisms, Food Preservation, Nitrogen Fixation and Nitrogen cycle are some of the main topics covered in this chapter.
A chapter full of colourful images and diagrams; it tells us about the life cycle of microorganisms, their habitat, how do they contribute in different industries and also their adversities. NCERT Grade 8 Science Chapter 2, Microorganisms: Friend and Foe deals with the role of microorganisms such as bacteria, yeast and fungi in the making of curd, bread, alcohol and antibiotic medicines. It also helps the students to learn how microorganisms such as cyanobacteria and algae help in nitrogen fixation and cleaning the environment.
The next section of the chapter deals with harmful effects of microorganisms. Pathogens are disease causing organisms that spread diseases. This section involves the role of different bacteria, virus and protozoa in the spread of diseases by using insects as the vector.The chapter also deals different methods such as cooling, heating, pasteurisation and others to prevent food from microbial attack and preserve it for a long time. The chapter concludes by discussing the process of nitrogen fixation and nitrogen cycle that help to maintain environmental balance.
Get 100 percent accurate NCERT Solutions for Class 8 Science Chapter 2 (Microorganisms : Friend and Foe) explained by expert Science teachers. We provide solutions for the questions given in Class 8 Science textbook as per CBSE Board guidelines from the latest NCERT book for Class 8 Science. The topics and sub-topics in Chapter 2 Microorganisms : Friend and Foe are given below
Ex 2.1 - Microorganisms
Ex 2.2 - Where do Microorganisms Live?
Ex 2.3 - Microorganisms and Us
Ex 2.4 - Harmful Microorganisms
Ex 2.5 - Food Preservation
Ex 2.6 - Nitrogen Fixation
Ex 2.7 - Nitrogen Cycle.
We cover all exercises in the chapter given below:-
Chapter 2 - 9 Questions with Solutions.
Other than given exercises, you should also practice all the solved examples given in the book to clear your concepts on Microorganisms : Friend and Foe. Download the free PDF of Chapter 2 Microorganisms : Friend and Foe and take the print out to keep it handy for your exam preparation.