Biochemical Oxygen Demand (BOD) in a river water
remains unchanged when algal bloom occurs
has no relationship with the concentration of oxygen in the water
gives a measure of Salmonella in the water
gives a measure of Salmonella in the water
D.
gives a measure of Salmonella in the water
Biochemical Oxygen Demand (BOD) is the amount of oxygen used for biochemical oxidation by micro-organisms in a unit volume of water. Polluted water has high BOD. Thus, when sewage gets mixed with river water, BOD will increase.
A common biocontrol agent for the control of plant diseases is
Baculovirus
Bacillius thuringiensis
Glomus
Glomus
A person likely to develop tetanus is immunised by administering
dead germs
preformed antibodies
wide spectrum antibiotics
wide spectrum antibiotics
Which of the following is not used as a biopesticide?
Trichoderma harzianum
Nuclear Polyhedrosis virus (NPV)
Nuclear Polyhedrosis virus (NPV)
The common nitrogen -fixer in paddy field is
Rhizobium
Azopirillum
Oscillatoria
Oscillatoria
