Microbes in Human Welfare Class 12 MCQs Questions with Answers

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

2. Methanogens do not produce

3. Term antibiotic was first used by :

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

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

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

7. Bacillus thuringiensis is used to control

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

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

10. Azoila has symbiotic relationship with:

11. Usnic acid is an antibiotic obtained from :

12. Citric acid is produced by:

13. Process of biogas production is

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

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

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

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

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

19. Lactic acid is formed by the process of

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