Two types of chlorophyll are found in plants and the green algae . In the chloroplast, both types are associated with integral membrane proteins in the thylakoid membrane . This property enables these molecules to absorb light. Both chlorophylls absorb light most strongly in the red and violet parts of the spectrum .
Green light is absorbed poorly.
Thus when white light shines on chlorophyll-containing structures like leaves, green light is transmitted and reflected and the structures appear green. Carotenoids Chloroplasts also contain carotenoids. These are also pigments with colors ranging from red to yellow. Carotenoids absorb light most strongly in the blue portion of the spectrum. They thus enable the chloroplast to trap are larger fraction of the radiant energy falling on it.