The free-livings fungus Trichoderma can be used for
killing insects
biological control of plant diseases
controlling butterfly caterpillars
producing antibiotics
What would happen if oxygen availability to activated sludge flocs is reduced?
I will slow down the rate of degradation of organic matter
The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs
Flocs would increase in size as anaerobic bacterial would grow around flocs
Protozoa would grow in large numbers
Mycorrhiza does not help the host plant in
enhancing its phosphorus uptake capacity
increasing its tolerance to drought
enhancing its resistance to root pathogens
increasing its resistance to insects
Which one of the following is not a nitrogen-fixing organism?
Anabaena
Nostoc
Azotobacter
Pseudomonas
Big holes in Swiss cheese are made by a
a machine
a bacterium that produces methane gas
a bacterium producing a large amount of carbon dioxide
a fungus that releases a lot of gases during its metabolic activities