EASY
12th West Bengal Board
IMPORTANT
Earn 100

During primary treatment of sewage solid particles settle down called as-

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Important Questions on Microbes in Human Welfare

EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 28
In the rumen of cattle which one of the following beneficial bacteria is present?
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 31

An organism used as a biofertilizer for raising soya bean crop is.

EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 32
Which one of the following is not a biofertilizer?
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 33
Due to which of the following organisms, yield of rice is increased?
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 34
Free living bacteria that can fix N2 from the soil is.
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 35
Biogas produced by fermentation of manure, sewage, cattle dung, etc. predominantly comprises -
MEDIUM
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 36
Select the correct statement.
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 37
Biogas production is carried out by-