All green plants are?

 Autotrophs refer to all green plants.

This is owing to the fact that green plants produce their own sustenance from very simple chemicals such as carbon dioxide and water found in their environment. This is achieved through the photosynthesis process.

These green plants contain chlorophyll, a green pigment that aids in the production of food by absorbing energy from the sun. Green plants, for the most part, generate their own food — not only for themselves, but also for non-green plants, animals, and humans.