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ICSE Class 9 Biology Question 6 of 10

Economic Importance of Bacteria — Question 8

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Question

Question 8

State the differences between:

(a) Decay and putrefaction.

(b) Pasteurization and sterilization of food/objects/equipments.

Answer

(a) Difference between Decay and Putrefaction:

DecayPutrefaction.
Complete breakdown of organic matter by bacteria.Incomplete breakdown of organic matter by bacteria.
Does not emit a foul smell.Emits a foul smell.

(b) Difference between Pasteurization and Sterilization:

PasteurizationSterilization
Temperature - 60°CTemperature - 110°C
Does not kill sporesKills even spores
Partial sterilizationComplete sterilization
Example – Milk sterilizationExample – Canned food sterilization.