2. Microorganisms : Friend And Foe Class 8 Science [LATEST] Solutions Chapter Review in English - CBSE Study
NCERT Solutions for Class 8 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 2. Microorganisms : Friend And Foe with detailed explanations and step-by-step answers for better exam preparation. Each Chapter Review is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 8 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 8 English Medium Science All Chapters:
2. Microorganisms : Friend And Foe
1. Chapter Review
Chapter Review:
- There are other living organisms around us which we cannot see with eyes alone. These are called microorganisms or microbes.
- Microorganisms are classified into four major groups. These groups are bacteria, fungi, protozoa and some algae.
- Viruses are quite different from other microorganisms. They reproduce only inside the host organism; bacterium, plant or animal cell.
- Microorganisms are found in air, water and in the bodies of plants and animals.
- They can live in all kinds of environment, ranging from ice cold climate to hot springs and deserts to marshy lands.
- Some microorganisms are useful for commercial production of medicines and alcohol.
- Some microorganisms decompose the organic waste and dead plants and animals into simple substances and clean up the environment.
- There are some insects and animals which act as carriers of disease causing microbes. Like housefly.
- Disease causing agents are called pathogens.
- When a disease-carrying microbe enters our body, the body produces antibodies to fight the invader.
- Several diseases, including cholera, tuberculosis, smallpox and hepatitis can be prevented by vaccination.
- Process of conversion of sugar into alcohol is known as fermentation.
- Medicines which kill or stop the growth of the disease-causing microorganisms. Such medicines are called antibiotics.
- Microorganisms like amoeba can live alone, while fungi and bacteria may live in colonies.
- Microorganisms are used to increase soil fertility by fixing nitrogen.
- Lactobacillus bacteria are found in curd, which promotes the formation of curd.
- Sugar is converted into alcohol by yeast.
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