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Lakhmir Singh Science Class 8 Solutions Micro-Organisms – Friends and Foe (Chapter 2)

Lakhmir Singh Solutions for Class 8 Science Chapter 2 describes the harmful and useful types of microbes available around us and their importance in different areas. The main topics that are covered in this chapter are microorganisms and us, harmful microorganisms, where do microorganisms live, food preservation, nitrogen fixation, and nitrogen cycle.

In this chapter of Lakhmir Singh Solutions for Class 8 Science, you will see colourful images and diagrams that help you in understanding the chapter in a better way. It explains the life cycle of microorganisms, the habitat of microorganisms, how microorganisms contribute to various industries, and also the adversities of microorganisms. The chapter has around 5 exercises with 104 questions in total.

Lakhmir Singh Class 8 Science Chapter 2 illustrates the role of microorganisms such as yeast, bacteria, and fungi in the making of alcohol, curd, bread, and antibiotic medicines. Referring to our Lakhmir Singh Solutions for Class 8 Science will help you to learn how microorganisms such as cyanobacteria and algae help in the fixation of nitrogen and cleaning the environment.

Important Topics for Lakhmir Singh Solutions for Class 8 Science Chapter 2

The main topics and sub-topics of Chapter 2 – Microorganisms: Friends and Foe are described below. Refer to have a clear understanding of the chapter.

Microorganisms

A microorganism is an organism that is too small and is referred to as microscopic. They are often described using single-celled, or unicellular organisms; though, some unicellular species are visible to the naked eye, and some multicellular species are microscopic.

Where Do Microorganisms Live?

Microorganisms may be single-celled like bacteria, some protozoa, algae, or multicellulars such as algae and fungi. They can live under all types of environment, ranging from ice cold climate to hot springs and deserts to soggy lands. They are also found inside the bodies of animals comprising humans.

Microorganisms and Us

In this topic of Chapter 2, it has been described that microorganisms are found all around us and even inside our bodies. The category ‘Microbes’ comprises an enormous range of organisms containing viruses, algae, bacteria, fungi, archaea, and protozoa.

Harmful Microorganisms

Many of the microorganisms available in the environment are harmful to us and even cause diseases. Harmful microorganisms comprise bacteria, fungi, protozoa, etc. They cause numerous diseases in animals, human beings, and plants which can even lead to death.

Food Preservation

Food preservation stops the evolution of microorganisms, or other microorganisms, as well as reducing the oxidation of fats that cause rancidity. Food preservation may also consist of procedures that make visual deterioration, such as the enzymatic browning reaction in apples after they are cut during the preparation of food.

Nitrogen Fixation 

Nitrogen fixation is a procedure through which molecular nitrogen in the air is transformed into ammonia or allied nitrogenous composites in soil. Atmospheric nitrogen is a comparatively nonreactive molecule that is metabolically inadequate to all but a few microorganisms.

Nitrogen Cycle

It is one of the important topics to study in chapter 2 of Lakhmir Singh Class 8 Science. In this topic, the nitrogen cycle is considered as the biogeochemical cycle by which nitrogen is transformed into multiple chemical forms as it circulates among the atmosphere, terrestrial, and marine ecosystems.

The transformation of nitrogen can be carried out through both physical and biological processes. Other important processes in the nitrogen cycle consist of fixation, nitrification, ammonification, and denitrification. 

Exercise-Wise Discussion of Lakhmir Singh and Manjit Kaur Solutions of Class 8 Science Chapter 2 – Microorganisms: Friends and Foe

This chapter of Lakhmir Singh Book for Class 8 Science has a total of 5 exercises with a total of 104 questions which are entirely based on the latest exam pattern. The questions range from basic to advance level so that you can easily understand each and every topic of the chapter. Below you will see how the exercises are divided into the chapter. 

Exercise 1 – Very Short Answer Type Questions

The first exercise of the chapter has around 40 questions which are very short answer type questions. These questions are based on the harmful and useful types of microbes available around us and their importance in different areas. 

Exercise 2 – Short Answer Type Questions

This exercise has around 31 questions which are entirely based on topics like the life cycle of microorganisms, the habitat of microorganisms, and how microorganisms contribute to various industries. 

Exercise 3 – Long Answer Type Questions

This exercise set has a total of 8 questions in which you need to give proper reasoning of the situation mentioned. 

Exercise 4 – Multiple Choice Questions (MCQs)

This exercise set has a total of 20 questions in which you need to choose the right answer from the options available. 

Exercise 5 – Questions Based on High Order Thinking

This exercise set has a total of 5 questions in which you need to tell the reasoning why a situation happened. This exercise also has a diagram question which makes it easier for you to understand the question.

If you face issues in solving the questions, you can refer to Lakhmir Singh and Manjit Kaur Solutions for Class 8 Science Chapter 2 prepared by the experts at Instasolv.

Benefits of Lakhmir Singh Solutions for Class 8 Science Chapter 2 – Microorganisms: Friends and Foe

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