These are green non-motile organisms which are majorly green in colour and which are capable of preparing their own food
Plants produce food by the photosynthesis process in daylight.
Without sunlight the process of photosynthesis will not work as it has light in its name itself and is a key component in food preparation.
Photosynthesis is a process in which plants obtain their food obtain with the help of carbon dioxide, water, and chlorophyll (a green color pigment in plants) in the presence of sunlight.