Explain why there are usually several types of pigments present in chloroplasts

Because they interact with light to absorb only certain wavelengths, pigments are useful to plants and other autotrophs - organisms which make their own food using photosynthesis, in plants, algae, and Cyanobacteria, pigments are the means by which the energy of sunlight is captured for photosynthesis

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey