This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 10 Microbes In Human Welfare – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 12 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Antibiotics and what they do are used to treat conditions which of our body systems? A) Immune System. B) Skeletal System. C) Endocrine System. D) Central Nervous System. Show Answer Correct Answer: A) Immune System. 2. What serves as the inoculum? A) Biogas. B) Activated sludge. C) Floc. D) BOD. Show Answer Correct Answer: B) Activated sludge. 3. Bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of: A) Lipases and Proteases. B) Pectinases and Proteases. C) Amylases and Lipases. D) Streptokinase and Pectinases. Show Answer Correct Answer: B) Pectinases and Proteases. 4. Identify the ODD one out regarding the type of organism: A) Aspergillus niger. B) Rhizopus. C) Penicillium. D) Acetobacter aceti. Show Answer Correct Answer: D) Acetobacter aceti. 5. In paddy fields, which organism serves as an important biofertilizer? A) Rhizobium. B) Cyanobacteria (Blue Green Algae). C) Glomus. D) Methanobacterium. Show Answer Correct Answer: B) Cyanobacteria (Blue Green Algae). 6. The sediment produced in the settling tank during secondary sewage treatment is called: A) Primary sludge. B) Activated sludge. C) Anaerobic sludge. D) Bacterial flocs. Show Answer Correct Answer: B) Activated sludge. 7. Secondary treatment of sewage is mainly a A) Physical process. B) Biological process. C) Chemical process. D) Mechanical process. Show Answer Correct Answer: B) Biological process. 8. Ethanol can be produced using ..... A) Saccharomyces cerevisiae. B) Escherichia coli. C) Pseudomonas syringae. D) None of the above. Show Answer Correct Answer: A) Saccharomyces cerevisiae. 9. In gobar gas, the maximum amount is that of: A) Butane. B) Methane. C) Propane. D) Carbon dioxide. Show Answer Correct Answer: B) Methane. 10. Which one of the following helps in the absorption of phosphorus from soil by plants? A) Glomus. B) Rhizobium. C) Frankia. D) Anabaena. Show Answer Correct Answer: A) Glomus. 11. Saccharomyces cerevisiae is used primarily for A) Baking. B) Bleaching. C) Biofuel. D) None of the above. Show Answer Correct Answer: A) Baking. 12. Which of the following bacterium produces butyric acid? A) Acetobacter aceti. B) Clostridium butylicum. C) Lactobacillus. D) None of these. Show Answer Correct Answer: B) Clostridium butylicum. 13. The semi-solid organic material that comes out of a wastewater treatment plant after completion of the wastewater treatment process is called A) Wastewater. B) Pathogenic. C) Sewage. D) Sludge. Show Answer Correct Answer: D) Sludge. 14. What is effluent? A) The suspended solids in the water. B) The partially treated wastewater moving through the facility. C) The solids that come out of the digesters. D) Water-borne diseases. Show Answer Correct Answer: B) The partially treated wastewater moving through the facility. 15. In Secondary treatment, once the BOD of sewage or waste water is reduced significantly, the effluent is then passed into a: A) Anaerobic sludge digester. B) Settling tank. C) Aeration tank (again). D) River directly. Show Answer Correct Answer: B) Settling tank. 16. Biogas produced by fermentation of manure, sewage, cattle dung, etc. predominantly comprise A) Methane, nitrogen and hydrogen. B) Methane and carbon dioxide. C) Methane and carbon monoxide. D) Methane and nitric oxide. Show Answer Correct Answer: B) Methane and carbon dioxide. 17. Which of the followimg fixes nitrogen in water logged paddy fields? A) Rhizobium. B) Oscillatoria. C) Mycorrhiza. D) Azotobacter. E) Azospirillum. Show Answer Correct Answer: B) Oscillatoria. 18. Physical removal of large and small from the sewage through filtration and sedimentation is called: A) Primary treatment. B) Secondary treatment. C) Tertiary treatment. D) Quaternary treatment. Show Answer Correct Answer: A) Primary treatment. 19. Lactic Acid Bacteria (LAB) grow in milk and convert it to curd. During growth, the LAB produce acids that: A) Completely digest the milk proteins. B) Coagulate and partially digest the milk proteins. C) Increase the Vitamin C content. D) Sterilize the milk by killing all other bacteria. Show Answer Correct Answer: B) Coagulate and partially digest the milk proteins. 20. Which ministry initiated the Ganga Action Plan? A) Ministry of Agriculture. B) Ministry of Environment and Forests. C) Ministry of Health. D) Ministry of Water Resources. Show Answer Correct Answer: B) Ministry of Environment and Forests. 21. Primary treatment of sewage basically involves: A) Digestion of organic matter by fungi. B) Physical removal of particles through filtration and sedimentation. C) Formation of flocs. D) Production of biogas. Show Answer Correct Answer: B) Physical removal of particles through filtration and sedimentation. 22. Assertion (A):Use of fertilizers greatly enhance crop productivityReason(R):Irrigation is very important in increasing crop productivity. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true But R is not correct explanation of A. C) A is true, but R is false. D) Both A and R are false. Show Answer Correct Answer: B) Both A and R are true But R is not correct explanation of A. 23. Toddy is made by fermenting: A) Sap from palms. B) Coconut water. C) Bamboo shoots. D) Rice water. Show Answer Correct Answer: A) Sap from palms. 24. Antibiotics mostly obtained from A) Algae. B) Fungi. C) Actinomycetes. D) Both but a and c. Show Answer Correct Answer: D) Both but a and c. 25. In the secondary treatment of sewage, the major part of the activated sludge is pumped into large tanks called: A) Aeration tanks. B) Anaerobic sludge digesters. C) Primary settling tanks. D) Oxidation ponds. Show Answer Correct Answer: B) Anaerobic sludge digesters. ← PreviousRelated QuizzesClass 12 Biology Chapter 10 Microbes In Human Welfare Quiz 1Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 2Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 3Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 4Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 5Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 6Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 7Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 8Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 9Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books