Welcome to the NCERT Solutions for Class 8 Science - Chapter Microorganisms: Friend and Foe. This page offers a step-by-step solution to the specific question from Exercise 1, Question 2: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.
Tick the correct answer:
(a) Yeast is used in the production of
(i) sugar (ii) alcohol (iii) hydrochloric acid (iv) oxygen
(b) The following is an antibiotic
(i) Sodium bicarbonate (ii) Streptomycin (iii) Alcohol (iv) Yeast
(c) Carrier of malaria-causing protozoan is
(i) female Anopheles mosquito (ii) cockroach (iii) housefly (iv) butterfly
(d) The most common carrier of communicable diseases is
(i) ant (ii) housefly (iii) dragonfly (iv) spider
(e) The bread or idli dough rises because of
(i) heat (ii) grinding (iii) growth of yeast cells (iv) kneading
(f) The process of conversion of sugar into alcohol is called
(i) nitrogen fixation (ii) moulding (iii) fermentation (iv) infection
(a) (ii) Alcohol
Yeast is used in the production of alcohol. This process is known as fermentation.
(b) (ii) Streptomycin
Streptomycin is an antibiotic, it is used to relieve the pain and kills other disease causing microorganisms.
(c) (i) Female Anopheles mosquito
Malaria is caused by a mosquito. The carrier of Malaria causing protozoan is Female Anopheles mosquito.
(d) (ii) Housefly
The most common carrier of communicable disease is housefly. It spreads the disease causing microorganisms.
(e) (iii) Growth of yeast cells
This process is called as fermentation. The dough rises due to the increased growth of yeast cells.
(f) (iii) Fermentation
The conversion of sugar into alcohol with the help of yeast cells is called as fermentation.
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
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Read MoreWelcome to the NCERT Solutions for Class 8 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 2: Tick the correct answer: (a) Yeast is used in the production of (i) sugar&n....
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