Question
What are the two main ways in which oxygen is consumed and carbon dioxide is produced?
Solution
The two ways in which the oxygen is consumed and carbon is produced are :
(i) Respiration - in which oxygen is taken up and broken down into glucose molecules to produce energy for life activities. During this process carbon-dioxide is released.
(ii) Combustion - in which fuels are burnt in presence of oxygen to produce carbon dioxide. Forest fires also consume oxygen and produce carbon dioxide.
