Microbes in Human Welfare Class 12 MCQs Questions with Answers

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

2. Term antibiotic was first used by :

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

4. Azoila has symbiotic relationship with:

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

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

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

8. Bacillus thuringiensis is used to control

9. Usnic acid is an antibiotic obtained from :

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

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

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

13. Lactic acid is formed by the process of

14. Methanogens do not produce

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

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

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

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

19. Process of biogas production is

20. Citric acid is produced by: