- We need energy to stay alive.
- We get this energy from food we eat.
- During digestion, food is broken down into simpler substances.
- For example, rice and potato contains starch.
- The starch breaks down to form glucose.
- This glucose combines with oxygen in the cells of our body and releases energy, which helps to do the various works.
- During this process, energy is given out. Hence this reaction can be called exothermic reaction.
- The special name of this reaction is respiration.
- So, respiration is considered as exothermic reaction.