Which of the following indicates that Euglena is plant?

The option that indicates that Euglena is a plant is "Presence of starch grain". Euglena is a unicellular organism that possesses both plant-like and animal-like characteristics. It contains chloroplasts, which are responsible for photosynthesis, and stores food in the form of paramylon, a type of starch grain. The conspicuous "eye" spot is actually a light-sensitive organelle that helps Euglena detect light for photosynthesis. The presence of a gullet in Euglena allows it to feed like an animal by ingesting food particles, and the flagellum enables it to move in a manner similar to that of animals.