This video lesson talks about micro-organisms and whether they are harmful or beneficial to us
Introduction to CBSE Class 8 Science Chapter "Microorganisms: Friend and Foe"
In this intriguing chapter, students delve into the dualistic nature of microorganisms in our lives. Microorganisms, or microbes, are tiny organisms that are not visible to the naked eye and include bacteria, fungi, protozoa, and viruses. They inhabit a variety of environments from the human body to the most extreme habitats on Earth. The chapter emphasizes that while some microorganisms are beneficial, others can cause diseases.
The beneficial aspects covered in the chapter include the use of microorganisms in food production, such as the fermentation process in bread and cheese, and in beverages like wine and beer. It also highlights the crucial role microbes play in the decomposition of organic waste, which recycles nutrients back into the environment, and their indispensable part in the Nitrogen cycle. The medical field benefits from microorganisms in the production of antibiotics and vaccines.
On the flip side, the chapter discusses how microorganisms are responsible for a range of diseases in plants and animals, including humans. It educates students on hygiene practices to control and prevent the spread of harmful microbes and touches upon food preservation methods that inhibit microbial growth to keep food safe for consumption.
Assignments for CBSE Class 8 Science Chapter “Microorganisms: Friend and Foe”
- Observation Diary: Keep a diary of fermented foods you encounter over a week and note the role microorganisms play in each.
- Hygiene Plan: Draft a personal hygiene plan that includes steps to prevent microbial infections.
- Experiment Time: Conduct a simple experiment to observe mold growth on bread and record your observations.
- Disease Report: Prepare a report on one microbial disease, describing its cause, symptoms, spread, and prevention.
- Debate Preparation: Prepare for a debate on “Are microorganisms more of a friend or a foe?”
Conclusion
“Microorganisms: Friend and Foe” is a chapter that brings to light the paradoxical nature of microbes and their extensive influence on various facets of life. It builds awareness among students about the omnipresence of these tiny entities and instills a balanced understanding of their beneficial roles and harmful impacts.
"Preparing for the Class 6 exam? Notebook is your go-to resource for learning anytime, anywhere. With courses, docs, videos, and tests covering the complete syllabus, Notebook has the perfect solution for all your study needs. Join Notebook today to get everything you need in one place.
Questions and Answers for CBSE Class 8 Science Chapter "Microorganisms: Friend and Foe"
- Q1: What are microorganisms? ANS: Microorganisms, or microbes, are tiny organisms that are usually invisible to the naked eye and include bacteria, fungi, protozoa, and viruses.
- Q2: How are microorganisms useful in food production? ANS: Microorganisms are used in the fermentation of bread, cheese, yogurt, and the production of alcoholic beverages, enhancing flavor and longevity.
- Q3: What role do microorganisms play in the environment? ANS: Microorganisms help in decomposing dead plants and animals, returning nutrients to the soil, and playing a vital part in processes like the Nitrogen cycle.
- Q4: Can microorganisms be harmful? ANS: Yes, certain microorganisms can cause diseases in plants, animals, and humans, and can be harmful if they contaminate food and water sources.
- Q5: How can the spread of harmful microorganisms be prevented? ANS: The spread can be prevented through proper sanitation, vaccination, boiling or treating water, and cooking and storing food correctly.
- Q6: What is the role of microorganisms in medicine? ANS: Microorganisms are used to produce antibiotics, which kill or inhibit the growth of disease-causing bacteria, and are used in vaccine production.
- Q7: Why is food preservation important? ANS: Food preservation is important to prevent the growth of microorganisms that can cause spoilage and foodborne illnesses.
- Q8: What hygiene practices help control the spread of microbes? ANS: Regular handwashing, disinfecting surfaces, using clean water, and safe food handling are key hygiene practices that help control microbes.
- Q9: How do microorganisms affect plants? ANS: Some microorganisms cause plant diseases that can lead to significant agricultural losses, but others can promote plant growth and health.
- Q10: What is fermentation and how do microorganisms contribute to it? ANS: Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol. Microorganisms like yeast and bacteria play a central role in this process.
