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2. Microorganisms : Friend And Foe Science class 8 in English Medium ncert book solutions Additional Questions With Solutions
2. Microorganisms : Friend And Foe Additional Questions With Solutions – Complete NCERT Book Solutions for Class 8 Science (English Medium). Get all chapter explanations, extra questions, solved examples and additional practice questions for 2. Microorganisms : Friend And Foe Additional Questions With Solutions to help you master concepts and score higher.
2. Microorganisms : Friend And Foe Science class 8 in English Medium ncert book solutions Additional Questions With Solutions
NCERT Solutions for Class 8 Science play an important role in helping students understand the concepts of the chapter 2. Microorganisms : Friend And Foe clearly. This chapter includes the topic Additional Questions With Solutions, which is essential from both academic and examination point of view. The solutions provided here are prepared strictly according to the latest NCERT syllabus and follow the guidelines of CBSE to ensure accuracy and relevance. Each question is explained in a simple and student-friendly manner so that learners can grasp the concepts without confusion. These NCERT Solutions are useful for regular study, homework help, and exam preparation. All textbook questions are solved step by step to improve problem-solving skills and conceptual clarity. Students of Class 8 studying Science can use these solutions to revise important topics, understand difficult questions, and practise effectively before examinations. The chapter 2. Microorganisms : Friend And Foe is explained in a structured way, making it easier for students to connect the theory with the topic Additional Questions With Solutions. By studying these updated NCERT Solutions for Class 8 Science, students can build a strong foundation, boost their confidence, and score better marks in school and board exams.
2. Microorganisms : Friend And Foe
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
See other sub-topics of this chapter:
1. Chapter Review 2. Text Book Exercise 3. Text Book Exercise 4. Additional Questions With Solutions 5. Additional Questions With Solutions