Molecular movements are required to provide various essential molecules throughout the body of an organism for repairing and maintaining their structure.
Molecular movements are those movements which we cannot observe from naked eyes but play an important role in all the life processes. For example the break down of water molecule during the process of photosynthesis, release of energy from glucose molecule, movement of solute molecules to regulates stomatal closure & opening. All these are the examples of molecular movement which regulate the important functions like respiration, photosynthesis etc.