Respuesta :
The student is most likely observing a chloroplast within the plant cell.
Answer: Chloroplast
The plant cells have only one type of green colored organelles, that is chloroplast. This is because the green color is imparted by the green colored pigment- chlorophyll. Also, these organelles are disc-shaped, stacked in a bundle. Mitochondria, vacuole and golgi apparatus are different in shape, as compared to chloroplast.