(ii) Measles Board – CBSE. Answer: *Science , Mathematics *1.List of All Subjects Covered in RD Sharma Chapter 1 Rational Numbers Chapter 2 Powers Chapter 3 Squares and Square Roots Food preservation: Processing of food to prevent their spoilage and to retain their nutritive value for period is called food preservation. Why are children given vaccination ? Language: English. In this chapter you will study about laws of reflection, regular and diffused reflection, multiple images, kaleidoscope, structure of human eye, braille system, lateral inversion etc. S Chand Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions are free of cost for the students. They just reproduce. Question 21. Name any two human diseases caused by bacteria. Question 55 A. Text Book – SCIENCE. The S Chand Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions are crafted by subject experts who have vast knowledge over the subject. (c) What is the sex of mosquito P? B and D as these two organisms are able to fix nitrogen gas from atmosphere to enrich soil with nitrogen compounds hence increasing fertility of soil. solution. Several diseases including tuberculosis, smallpox, cholera and hepatitis can be prevented by vaccination. These make the food unfit for consumption. How do micro-organisms help in cleaning the environment? Important Keywords. Question 23. Answer: (a) by fungi The process of conversion of sugar into alcohol is known as fermentation. In this process, milk is heated to about 70oC for 15 to 30 seconds to kill bacteria. All mosquitoes breed in water . Which natural phenomenon occurring in the sky is responsible for nitrogen fixation? Question 61. When it bits a person suffering from malaria, it sucks the blood of that person which contains the malarial parasite microbes. Which of the following disease is not caused by bacteria? Question 66 B. About the book. B. fungus During this process, lactobacillus bacterium acts on lactose sugar present in milk and converts it into lactic acid. Answer: Question 8. B. sodium hydroxide The two common insects which act as carriers of disease-causing micro-organisms (or disease-causing microbes) are housefly and mosquito. Contact. And the working mechanism of the antibiotics is to break the cell wall and attack on the bacteria. Answer: Vaccine consists dead and weakened microbes which are harmless and do not cause any disease. Answer: s chand class xii physics s chand flipkart com. (v) d ; Protozoa Plasmodium causes malaria disease. How does a vaccine work? Sodium benzoate and sodium meta bisulphite are common preservatives which are used in the preservation of fruits as jams and jellies. Class – 8 (Eight). C. cholera Lactobacillus bacterium is utilized in making curd from milk. Question 69. Question 13. HIV causes AIDS disease. The Lakhmir Singh Science Chapter 2 Micro Organisms Friends And Foe Solutions Class 8 can help you make your concepts strong with the help of questions having a different level of difficulty. Answer: Answer: Answer: Author Name – Lakhmir Singh Manjit Kaur. Timely vaccination against diseases should also be taken. (viii) Malaria Next it is chilled very fast to prevent bacteria from growing. State an important function performed by blue-green algae. Visit now and download Free PDFs of solved chapter-wise solutions for Lakhmir Singh and Manjit Kaur … The bread dough rises because of: (vi) A virus (a) Fixing nitrogen The main aim of writing science solutions for class 8 to help students understand … Subject – Science. NCERT Solutions of Class 8 Science of Chapter 18 includes solutions of all 11 questions given in … (a) Foot and mouth disease is caused by a virus. B.Sc.,B.Ed. (d) Algae – (I) Spirogyra (II) Chlamydomonas (iv) Yeast Senior Teacher of Science in reputed school of Directorate of Education, Delhi. 2 Comments. B. virus The spreading of diseases by houseflies can be prevented by following ways: Question 45 A. Lactobacillus – Bacteria ; The carrier of malaria causing protozoan called plasmodium is female anopheles mosquito. These acids are utilized by various organisms. How do houseflies carry disease-causing microbes-(or pathogens)? Answer: Answer: Become our. (a) female Anopheles mosquito? Question 50. Education Franchise × Contact Us. Malaria and dengue spread by mosquitoes. (c) Yellow vein mosaic of bindi (Okra) – Virus, Question 95. These are as follows: Question 68 A. Name the causative micro-organisms do the following belong? S Chand Science Class 8 Solutions are series of books which conforms to the NCERT syllabus. 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