Case Study Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare
Table of Contents
Question 1:
Villagers in a place near Chambur started planning to make power supply for agricultural purposes from cow dung. They have started a biogas plant for the purpose. Study the flow chart for biogas production given below and answer the following questions.
(i) Biogas is composed of majorly
(a) methane, CO2 and O2
(b) CO2, H2S and H2O
(c) methane, CO2 and H2S
(d) H2S, H and O2.
(ii) In the given flow chart, ‘A’ denotes
(a) aerobic bacteria
(b) methanogenic bacteria
(c) cellulose degrading bacteria
(d) yeast and protozoa.
(iii) What is represented by ‘B’ in the flow chart?
(a) Carbohydrates
(b) Protein polymers
(c) Organic acids
(d) Fat globules
(iv) ‘C’ in the given flow chart causes
(a) aerobic breakdown of complex organic compounds
(b) anaerobic digestion of complex organic compounds
(c) fermentation of organic compounds
(d) fermentation of monomers.
(v) If ‘A’ is not added in the procedure
(a) methane will not be formed
(b) CO2 will not be formed
(c) organic compounds will not be converted to H2S
(d) O2 will not be formed.
Answer
Answer:(i) (c) : Biogas is composed of methane (50-70%), carbon dioxide (30-40%) with traces of nitrogen, hydrogen sulphide and hydrogen.
(ii) (b)
(iii) (c) : In the second stage of biogas production, the simple soluble compounds or monomers are acted upon by fermentation causing microbes and converted into organic acids especially acetic acid.
(iv) (b)
(v) (a)
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