Almost everything we eat comes from plants, either directly from staple foods such as fruit and vegetables, or indirectly through livestock, which is powered by the plants that make up the forage.
In other words, plants are the basis of the whole food chain, or what ecologists call the first trophic level. Understanding how plants produce what we eat is very important .
The leaves are the organs vedes on a sheet, leaving the stem. The green is due to have a substance called chlorophyll. The leaves transpire and breathe, produce the sap and store food.