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Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 2 (25 MCQs)

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1. A common biocontrol agent for the control of the plant diseases, is
2. Which of the following cyanobacteria can fix atmospheric nitrogen?A. NostocB. AnabaenaC. OscillatoriaD. Yeast
3. The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water. Indirectly, BOD is a measure of:
4. Citric acid is produced by-
5. The source of the enzyme Streptokinase is:
6. A bioactive compound used as clot buster for removing blood clots from blood vessels:
7. Fungi which form symbiotic associations with plants are .....
8. In the mycorrhizal association, the fungal symbiont absorbs phosphorus from soil and passes it to the plant. What other benefits does the plant derive?
9. Which of the following show the competitive inhibition in the pathway of cholesterol synthesis?
10. Which one controls the growth of strangler vine in citrus crops.
11. Yeast is an important source of
12. Conversion of milk to curd improves its nutritional value by increasing the amount of (a) vitamin D (b) vitamin A(c) vitamin B12 (d) vitamin E
13. 'Toddy', a traditional drink of some parts of southern India, is made by fermenting:
14. Bacillus thuringiensis is used for
15. The technology of biogas production from cow dung was developed inIndia largely due to the efforts of:
16. What are some examples of food made by fungi
17. What is a beneficial relationship between a plant and a fungus called?
18. Which of the following antibiotics was discovered first?
19. The organism used to digest polyurethane is a
20. Which of the following microbes are used for the commercial production of citric acid?
21. Match the bioactive molecule with its source and function:
22. Trichoderma is an effective biocontrol agent for:
23. Scientists have introduced ..... gene into plants to impart resistance to insect pests.
24. Organisms called Methanogens are most abundant in
25. Assertion (A):Biogas is used as fuel for cooking and lightingReason(R):It is considered as ecofriendly and pollution free source of energy
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