Microbes in Human Welfare Class 12 MCQs Questions with Answers

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

2. Usnic acid is an antibiotic obtained from :

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

4. Bacillus thuringiensis is used to control

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

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

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

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

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

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

11. Term antibiotic was first used by :

12. Citric acid is produced by:

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

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

15. Azoila has symbiotic relationship with:

16. Process of biogas production is

17. Methanogens do not produce

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

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

20. Lactic acid is formed by the process of