Case Study Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare

Home » Biology » Case Study Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare

Case Study Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare

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)

You may also like:

  • Case Study and Passage Based Questions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants

    In CBSE Class 12 Biology Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked. Here, we have provided … Continue reading Case Study and Passage Based Questions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants

  • Case Study and Passage Based Questions for Class 12 Biology Chapter 3 Human Reproduction

    In CBSE Class 12 Biology Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked. Here, we have provided case … Continue reading Case Study and Passage Based Questions for Class 12 Biology Chapter 3 Human Reproduction

  • Case Study Questions for Class 12 Biology Chapter 8 Human Health and Diseases

    Case Study Questions for Class 12 Biology Chapter 8 Human Health and Diseases Question 1: In a study to test a new vaccine against a viral disease, mouse model testing is done. In this process, mice are vaccinated and their blood samples were tested. Mice developed mild disease symptom. After few days those mice were … Continue reading Case Study Questions for Class 12 Biology Chapter 8 Human Health and Diseases

  • Case Study Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare

    Case Study Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare 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 … Continue reading Case Study Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare

  • Case Study Questions for Class 12 Biology Chapter 11 Biotechnology – Principles and Techniques

    Case Study Questions for Class 12 Biology Chapter 11 Biotechnology – Principles and Techniques Question 1: The DNA, which is transferred from one organism into another by joining it with the vehicle DNA is called passenger or foreign DNA. Generally three types of passenger DNAs are used. These are complementary DNA (cDNA), synthetic DNA (sDNA) … Continue reading Case Study Questions for Class 12 Biology Chapter 11 Biotechnology – Principles and Techniques

  • Case Study Questions for Class 12 Biology Chapter 12 Biotechnology and Its Applications

    Case Study Questions for Class 12 Biology Chapter 12 Biotechnology and Its Applications Question 1: Transgenic cows have extra gene or genes inserted into their DNA. Firstly the genes for the desired product is identified and sequenced. Then a gene construct containing this desired gene is introduced into female cow cells. Transgenic bovine cells are … Continue reading Case Study Questions for Class 12 Biology Chapter 12 Biotechnology and Its Applications

  • Case Study Questions for Class 12 Biology Chapter 13 Organisms and Populations

    Case Study Questions for Class 12 Biology Chapter 13 Organisms and Populations Question 1: Organism P has thick lips and tongue so that it can easily feed on the commonly available spiny plants. Organism Q has thick layer of insulating fat under the skin. It was strong hooves to walk steadily on steep surfaces and … Continue reading Case Study Questions for Class 12 Biology Chapter 13 Organisms and Populations

  • Case Study Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation

    Case Study Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation Question 1: Within a region, species richness increases with increasing explored area, but only upto a limit. The given graph explains this relationship. (i) What does the given figure show?(a) Rivet-popper hypothesis(b) Species-area relationship(c) Proportionate number of species of major taxa(d) a-ecological diversity … Continue reading Case Study Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation

  • Case Study and Passage Based Questions for Class 12 Biology Chapter 1 Reproduction in Organisms

    Case Study/Passage Based Questions: Question 1: Given below is the diagram of a ginger rhizome. Answer the questions given below based onthe diagram. (i) Why do vegetative propagules in sugarcane and ginger appear from the nodes?(ii) Name the vegetative propagules in (a) Potato, and (b) Pistia.(iii) How does potato multiply? Answer Ans. (i) This is … Continue reading Case Study and Passage Based Questions for Class 12 Biology Chapter 1 Reproduction in Organisms

  • Case Study and Passage Based Questions for Class 12 Biology Chapter 4 Reproductive Health

    Case Study and Passage Based Questions for Class 12 Biology Chapter 4 Reproductive Health Case Study/Passage Based Questions: Question 1: Study the diagram of the female reproductive system given below. Answer the questionsbased on the diagram. (i) What does the diagram depict?(ii) At what stage zygote can be introduced in the fallopian tube in Zygote … Continue reading Case Study and Passage Based Questions for Class 12 Biology Chapter 4 Reproductive Health

Leave a Reply

PowerPoint Presentations (PPTs) for Class 7 to 12

%d bloggers like this:
search previous next tag category expand menu location phone mail time cart zoom edit close