Anaerobic bacteria digest animal waste a | Class 7 Science Chapter Physical and Chemical Changes, Physical and Chemical Changes NCERT Solutions

Question:

Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.

 (i) Process – A is a chemical change.
 (ii) Process – B is a chemical change.                                                                                                                                                                                                   (iii) Both processes A and B are chemical changes.
 (iv) None of these processes is a chemical change.

Answer:

(iii) Both process A and B are chemical change.
Anaerobic bacteria are those which works in the absence of oxygen. Burning the biogas as fuel is a chemical change because it is an irreversible process. Anaerobic bacteria digest animal waste and produce biogas as the final product in the absence of oxygen. Biogas is a natural gas, which is produced by bacteria.


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Welcome to the NCERT Solutions for Class 7 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 12: Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then bur....