2. Microorganisms : Friend And Foe Class 8 Science [LATEST] Solutions Additional Questions With Solutions 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 Additional Questions With Solutions 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
4. Additional Questions With Solutions
Additional Questions With Solutions
Que: What are the major groups of microorganisms?
Ans: (i) Bacteria (ii) Fungi (iii) Protozoa (iv) algae
Que: What are viruses?
Ans: Viruses are also microscopic. But they reproduce only inside the cells of the host organism, which may be bacteria, plant and animals etc. common cold influenza and cough are caused by viruses.
Que: Name three diseases caused by virus.
Ans: Polio, chicken pox and measles.
Que: Name three water born diseases.
Ans: Hepatitis, typhoid, cholera etc.
Que: How do microorganisms help us.
OR
Write the uses of microorganisms for various purposes.
Ans: The uses of microorganisms:-
(i) They are used in the preparation of curd, bread and cake.
(ii) They are also used in cleaning up of the environment.
(iii) They are used in the preparation of medicines.
(iv) They are used to increase soil fertility by fixing nitrogen.
Que: Name the microorganism which is found in curd.
Ans: Lactobacillus bacteria.
Que: Name the bacteria which promote the formation of curd.
Ans: Lactobacillus.
Que: What is fermentation?
Ans: The process of conversion of sugar of fruits juice into alcohol is known as fermentation.
Que: Name the gas produced by yeast during the process of fermentation.
Ans: Carbon dioxide.
Que: Name the microorganism which is used for large scale production of alcohol.
Ans: Yeast.
Que: What is food poisoning? What is its disadvantages.
Ans: Food poisoning could be due to the consumption of food spoilt by some microorganisms. Microorganisms that grow on our food sometimes produce toxic substances. These make the food poisonous causing serious illness and even death.
Que: What are antibiotics?
Ans: The medicines which kill or stop the growth of the disease causing bacteria such medicines are called antibiotics. Ex . streptomycin, penicillin and erythromycin etc.
Que: Name two antibiotics.
Ans:
(i) Streptomycin.
(ii) Penicillin
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