Answer:
Chloroplast detects light.
Step-by-step explanation:
Chloroplast in the Euglena detects light. It traps the sunlight which is used during the photosynthesis. The reason for the green color of the leaves are Chloroplast, as it is a green colored organelle. The eyespot in the euglena also helps to detect the light. Mitochondria is called as the power house of the cell as it creates energy.