Microbes in Human Welfare Class 12 MCQs Questions with Answers

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

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

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

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

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

6. Usnic acid is an antibiotic obtained from :

7. Citric acid is produced by:

8. Methanogens do not produce

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

10. Lactic acid is formed by the process of

11. Bacillus thuringiensis is used to control

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

13. Term antibiotic was first used by :

14. Process of biogas production is

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

16. Azoila has symbiotic relationship with:

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

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

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

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