This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 10 Microbes In Human Welfare – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The microscopic proteinaceous infectious agents are called- A) Protozoa. B) Fungi. C) Prions. D) Bacteria. Show Answer Correct Answer: C) Prions. 2. Which of the following microbes can be seen with the naked eye when grown on nutritive media? A) Viruses. B) Viroids. C) Bacteria and many Fungi. D) Prions. Show Answer Correct Answer: C) Bacteria and many Fungi. 3. Streptokinase, used as a 'clot buster' for removing clots from blood vessels of patients who have undergone myocardial infarction, is produced by: A) Staphylococcus. B) Streptococcus. C) Monascus. D) Trichoderma. Show Answer Correct Answer: B) Streptococcus. 4. Rennin employed in cheese production is a /an A) Anticoagulant. B) Enzyme. C) Antibiotic. D) Vitamin. Show Answer Correct Answer: B) Enzyme. 5. Cyclosporin A is produced from- A) Trichoderma polysporum (a fungus). B) Bacillus (a bacterium). C) Aspergillus (a fungus). D) All of these. Show Answer Correct Answer: A) Trichoderma polysporum (a fungus). 6. The dough used for making bread is fermented using: A) Lactobacillus. B) Propionibacterium sharmanii. C) Saccharomyces cerevisiae. D) Aspergillus niger. Show Answer Correct Answer: C) Saccharomyces cerevisiae. 7. The puffed-up appearance of dough used for making dosa and idli is due to the production of: A) O 2 gas. B) H 2 gas. C) CO 2 gas. D) CH 4 gas. Show Answer Correct Answer: C) CO 2 gas. 8. Which of the following is not produced with distillation A) Wine and whisky. B) Wine and beer. C) Wine and Brandy. D) Wine and rum. Show Answer Correct Answer: B) Wine and beer. 9. Which of the following is NOT a benefit provided by Glomus to the plant? A) Absorption of phosphorus from soil. B) Resistance to root-borne pathogens. C) Fixation of atmospheric nitrogen. D) Tolerance to salinity and drought. Show Answer Correct Answer: C) Fixation of atmospheric nitrogen. 10. Which of the following is a non-symbiotic biofertiliser? A) VAM. B) Azotobacter. C) Anabaena. D) Rhizobium. Show Answer Correct Answer: B) Azotobacter. 11. Baculoviruses (Nucleopolyhedrovirus) are excellent candidates for: A) Broad spectrum insecticidal applications. B) Species-specific, narrow spectrum insecticidal applications. C) Killing plants and mammals. D) Creating pollution. Show Answer Correct Answer: B) Species-specific, narrow spectrum insecticidal applications. 12. Which of the following alcoholic beverages are produced without distillation of the fermented broth? A) Whisky and Brandy. B) Wine and Beer. C) Rum and Brandy. D) Whisky and Rum. Show Answer Correct Answer: B) Wine and Beer. 13. The symbiotic bacteria Rhizobium fix atmospheric nitrogen into ..... in legume plants. A) Organic form. B) Inorganic form. C) Both. D) None. Show Answer Correct Answer: A) Organic form. 14. The examples of free-living soil bacteria which can fix atmospheric nitrogen into organic form are A) Azospirillum and Rhizobium. B) Azotobacter and Rhizobium. C) Azospirillum and Azotobacter. D) Azotobacter and mycorrhizae. Show Answer Correct Answer: C) Azospirillum and Azotobacter. 15. Dragonflies are useful to get rid of ..... A) Ladybird. B) Aphids. C) Mosquitoes. D) Both (b) and (c). Show Answer Correct Answer: D) Both (b) and (c). 16. The bioactive molecule Cyclosporin A is used as: A) A cholesterol lowering agent. B) An immunosuppressive agent. C) A blood clot remover. D) An antibiotic. Show Answer Correct Answer: B) An immunosuppressive agent. 17. Which of the following in sewage treatment removes suspended solids? A) Secondary treatment. B) Primary treatment. C) Sludge treatment. D) Tertiary treatment. Show Answer Correct Answer: B) Primary treatment. 18. Which one(s) is/are correct about Cyclosporin A? A) It is produced by the fungus Trichoderma polysporum. B) It is used as an immuno suppressive agent during organ transplantation. C) It is produced by a type of yeast, Monascus purpureus. D) Both a and b. Show Answer Correct Answer: D) Both a and b. 19. Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct? A) Clostridium butylicum-lactic acid. B) Aspergillus niger-citric acid. C) Yeast-statins. D) Acetobacter aceti-acetic acid. Show Answer Correct Answer: A) Clostridium butylicum-lactic acid. 20. The gas responsible for puffing-up appearance of dough comes from: A) Aerobic respiration. B) Fermentation. C) Photosynthesis. D) Photorespiration. Show Answer Correct Answer: B) Fermentation. 21. The bacteria Bacillus thuringiensis (Bt) are used to control: A) Butterfly caterpillars. B) Root-borne pathogens. C) Aphids and Vectors. D) Viral diseases in plants. Show Answer Correct Answer: A) Butterfly caterpillars. 22. The amount of oxygen required by the microbes in the decomposition of organic matter is called- A) Chemical oxygen demand. B) Biochemical oxygen demand. C) Total oxygen demand. D) Dissolve oxygen. Show Answer Correct Answer: B) Biochemical oxygen demand. 23. Probiotics are A) Cancer-inducing microbes. B) New kind of food allergens. C) Live microbial food supplements. D) Safe antibiotics. Show Answer Correct Answer: C) Live microbial food supplements. 24. Streptokinase, a clot buster used to remove clots from blood vessels of patients of myocardial infraction is obtained from A) Streptomyces. B) Genetically modified Streptococcus bacteria. C) Mortierella renispora. D) Candida lipolytica. Show Answer Correct Answer: B) Genetically modified Streptococcus bacteria. 25. Azolla pinnata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of A) N2 fixing bacteria. B) N2 fixing cyanobacteria. C) Mycorrhizae. D) All of these. Show Answer Correct Answer: B) N2 fixing cyanobacteria. ← PreviousNext →Related 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 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 10Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books