The organ which is sensitive to light in Euglena is the

The organ in Euglena that is sensitive to light is called the eyespot. The eyespot is a small, red-colored, pigmented area located near the base of the flagellum in Euglena. It contains a light-sensitive pigment that helps the organism detect the intensity and direction of light. This allows Euglena to move towards light for photosynthesis, and to avoid intense light that can damage its chloroplasts. Think of it like a tiny eye for Euglena that helps it navigate and survive in its environment!