Light and their colors are a powerful stimulus to attract human as well as humans. Different spectrum of light and their intensity play a major role in the physiological activity. Light stimulation change the activity of enzyme and pheromones and affect the behavior of organisms. Some key enzymes like actylcholinestrase (AChE) is triggered very fast in the exposure of red light than other one. Lymnaeidae and Planorbidae groups are of major medical and veterinary importance because they act as vector of zoonotic parasite and severely affect humans as well as cattle populations and cause heavy...