EASY
12th West Bengal Board
IMPORTANT
Earn 100

Azolla is used as a biofertilizer because it 

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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 42
Atmospheric nitrogen fixation is carried on by.
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 43
Which of the following is characterised as a biofertilizer? 
HARD
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 44

Match the items in column I with these of column II and select the correct answer from the codes given below:

Column I Column II
P. Blue-green algae as biofertilizers. (i) Ectomycorrhiza
Q. Fungi as biofertilizers. (ii) Thiobacillus sp.
R. Free living nitrogen fixing bacteria. (iii) Anabaena sp.
S. Phosphate solubilizing bacteria. (iv) Clostridium sp.
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 45
Trichoderma species are beneficial as
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 46
What is VAM?
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 47
The thurioside, a proteinaceous toxin, obtained from-
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 48
Which one of the following is the best fertilizer?
EASY
12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 11 - Microbes in Human Welfare>EXERCISE>Q 49
Sewage treatment is done only by