Which of the following bacteria is used extensively as a bio-pesticide?

(a)

Bacillus thurigiensis

(b)

Bacillus subtilis

(c)

Lactobacillus acidophilus

(d)

Streptococcus lactis

Which of the following is not involved in nitrogen fixation?

(a)

Pseudomonas

(b)

Azotobacter

(c)

Anabaena

(d)

Nostac

CO₂ is not released during

(a)

Alcoholic fermentation

(b)

Lactate fermentation

(c)

Aerobic respiration in animals

(d)

Aerobic respiration in plants

The purpose of biological treatment of waste water is to _______

(a)

Reduce BOD

(b)

Increase BOD

(c)

Reduce sedimentation

(d)

Increase sedimentation

The gases produced in anaerobic sludge digesters are

(a)

Methane, oxygen and hydrogen sulphide

(b)

Hydrogen sulphide, methane and sulphur dioxide

(c)

Hydrogen sulphide, nitrogen and methane

(d)

Methane, hydrogen sulphide and CO₂.