The answer is chloroplasts which contains chlorophyll and help the plant maintain its color. If you rub a leave on the ground you will be able to see some green marks like a crayon on the ground.
chloroplasts
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
