Microbial biocontrol agent that can be introduced in order to control butterfly caterpillars is the bacteria Bacillus thuringiensis (Bt). They sprayed onto vulnerable plants, where they eaten by the insect larvae. In the gut of the larvae, the toxin is released and the larvae get killed. The bacterial disease will kill the caterpillars, but leave other insects unharmed.

Correct Option: C

Microbial biocontrol agent that can be introduced in order to control butterfly caterpillars is the bacteria Bacillus thuringiensis (Bt). They sprayed onto vulnerable plants, where they eaten by the insect larvae. In the gut of the larvae, the toxin is released and the larvae get killed. The bacterial disease will kill the caterpillars, but leave other insects unharmed.

A - (iii), B - (iv), C - (i), D - (ii)

Correct Option: D

A - (iii), B - (iv), C - (i), D - (ii)

Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are obligate anaerobic ancient and primitive bacteria. They are involved in methanogenesis.

Correct Option: C

Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are obligate anaerobic ancient and primitive bacteria. They are involved in methanogenesis.

Clostridium butylicum is used for butyric acid production

Correct Option: D

Clostridium butylicum is used for butyric acid production

Fermentation refers to the breakdown of organic substances, particularly carbohydrates, under anaerobic conditions. Saccharomyces cerevisiae is used for fermenting carbohydrate. The ethyl alcohol and carbon dioxide are formed at the end of the process.

Correct Option: D

Fermentation refers to the breakdown of organic substances, particularly carbohydrates, under anaerobic conditions. Saccharomyces cerevisiae is used for fermenting carbohydrate. The ethyl alcohol and carbon dioxide are formed at the end of the process.