Microbes in Human Welfare Class 12 MCQs Questions with Answers

1. Methanogens do not produce

2. During the primary treatment of sewage, solid particles that settle down are called

3. Citric acid is produced by:

4. Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?

5. Process of biogas production is

6. Which of the following is widely used as a successful biofertiliser in Indian rice field ?

7. Which one of the following is not a nitrogenfixing organism?

8. Which one of the following is not used in organic farming?

9. BOD of wastewater is estimated by measuring the amount of

10. Bacillus thuringiensis is used to control

11. Term antibiotic was first used by :

12. The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is

13. The residue left after methane production from cattle dung is

14. The chemical substances produced by some microbes which can kill or retard the growth of other microbes are called

15. Usnic acid is an antibiotic obtained from :

16. Azoila has symbiotic relationship with:

17. Which one of the following can be used as biofertiliser in cotton field ?

18. The nutritive medium for growing bacteria and many fungi in laboratory is called

19. For retting of jute, the fermenting microbe is:

20. Lactic acid is formed by the process of