Microbes in Human Welfare Class 12 MCQs Questions with Answers

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

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

3. Citric acid is produced by:

4. Term antibiotic was first used by :

5. Process of biogas production is

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

7. Azoila has symbiotic relationship with:

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

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

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

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

12. Methanogens do not produce

13. Bacillus thuringiensis is used to control

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

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

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

17. Lactic acid is formed by the process of

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

19. Usnic acid is an antibiotic obtained from :

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