1. Respiration - Oxidation of food to liberate energy is respiration. Every living beings respire but every living beings do not breathe.
2. Excretion - After oxidation of food to give out nitrogenous waste products is known as excretion
3. Metabolism - Word given by Shwann. It is constructive as well as destructive process Constructive process is Anabolism. Destructive process is Catabolism
4. Irritability - Response against external stimuli is known as Irritability. Also known as taxis or topotaxis. It may be phillotaxis or phobotaxis.
5. Movement -