Microbes in Human Welfare Class 12 MCQs Questions with Answers

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

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

3. Lactic acid is formed by the process of

4. Usnic acid is an antibiotic obtained from :

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

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

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

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

9. Bacillus thuringiensis is used to control

10. Term antibiotic was first used by :

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

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

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

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

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

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

17. Process of biogas production is

18. Citric acid is produced by:

19. Methanogens do not produce

20. Azoila has symbiotic relationship with: