Microbes in Human Welfare Class 12 MCQs Questions with Answers

1. Citric acid is produced by:

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

3. Azoila has symbiotic relationship with:

4. Lactic acid is formed by the process of

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

6. Process of biogas production is

7. Methanogens do not produce

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

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

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

11. Bacillus thuringiensis is used to control

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

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

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

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

16. Usnic acid is an antibiotic obtained from :

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

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

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

20. Term antibiotic was first used by :