protoplasm is a living substance so it possesses biological properties also. Protoplasm has motion due to cyclosis, amoeboid and Brownian movement. These movements depend on age of cells, amount of water, genetic factors and chemical. Protoplasm exhibits irritability when provided stimuli. Sensitivity of protoplasm to external stimuli is called irritability. Transmission of stimuli from one place to another is called conductrvity. Besides irritability, conductivity also occurs in protoplasm of many cells e.g. nerve cells, muscle cells etc. Different chemical reactions take place in protoplasm. reactions are called Anabolic processes Constructive like synthesis of different types of biomolecules Destructive reaction like oxidation of food is called catabolic processes. Anabolic and catabolic processes collectively metabolism c Protoplasm has the capacity to take external material and re-synthesize them in a new form(assimilation). Respiration and excretion