HARD
12th CBSE
IMPORTANT
Earn 100

The diagram is that of a typical biogas plant. Explain the sequence of events occurring in a biogas plant to identify a, b and c. (Hints: a - sludge, b-gas holder, c- dung + water)
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Important Questions on Microbes in Human Welfare

MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 7
Why do farmers prefer biofertilizers to chemical fertilizers these days? Explain.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 7
 How do Anabaena and mycorrhizae act as biofertilizers?
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 8
Describe how biogas is generated from activated sludge. List the components of biogas.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 9
What are methanogens? Name the animals they are present in and the role they play there.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 10
State the medicinal value and the bioactive molecules produced by Streptococcus, Monascus and Trichoderma.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 11
What are methanogens? How do they help to generate biogas?
HARD
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 12
Choose any three microbes, from the following which are suited for organic farming which is in great demand these days for various reason. Mention one application of each one chosen: Mycorrhiza, Monascus, Anabaena, Rhizobium, Methanobacterium, Trichoderma.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 10 - Microbes in Human Welfare>TEST QUESTIONS>Q 13
How can sewage be used to generate biogas? Explain.