Microbial enzymes are used instead of chemical catalysts in chemical industry.

Explanation

Microbial enzymes are active at low temperature , pH and pressure , due to which energy is saved and erosion - proof instruments are also not necessary .
(ii) Enzymes carry out specific processes, hence unnecessary by - products are not formed due which expenses on purification are minimised .
(iii) Elimination and decomposition of waste materials is avoided and enzymes can be reused . Such enzymes are eco - friendly.
(iv) Therefore microbial enzymes are used instead of chemical catalysts in chemical industry.