12
MCQ (Single Correct Answer)
Mycorrhiza does not help the host plant in
A
enhancing its phosphorus uptake capacity
B
increasing its tolerance to drought
C
enhancing its resistance to root pathogens
D
increasing its resistance to insects
13
MCQ (Single Correct Answer)
Which one of the following is not a nitrogen-fixing organism?
A
Anabaena
B
Nostoc
C
Azotobacter
D
Pseudomonas
14
MCQ (Single Correct Answer)
Big holes in Swiss cheese are made by a
A
a machine
B
a bacterium that produces methane gas
C
a bacterium producing a large amount of carbon dioxide
D
a fungus that releases a lot of gases during its metabolic activities
15
MCQ (Single Correct Answer)
The residue left after methane production from cattle dung is
A
burnt
B
burried in land fills
C
used as manure
D
used in civil construction
16
MCQ (Single Correct Answer)
Methanogens do not produce
A
oxygen
B
methane
C
hydrogen sulphide
D
carbon dioxide