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Chlorophyll is a chlorin pigment found in cyanobacteria and the chloroplasts of algae and plants. Chlorophyll is an important molecule that plays a critical role in photosynthesis. Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis and absorbs most energy from wavelengths of violet-blue and orange-red light. Chlorophyl b is also involved in photosynthesis and absorbs primarily blue light. There are other forms of chlorophyl such as Chlorophyll c1, c2, c3 which are accessory pigments. Recently, Chlorophyll f was announced to be present in cyanobacteria and other oxygenic microorganisms that form stromatolites

chlorophyll: One of a number ofpigments, including (chlorophyll aand chlorophyll b), that are responsiblefor the green colour of mostplants. Chlorophyll molecules are theprincipal sites of light absorption inthe light-dependent reactions ofphotosynthesis. They are magnesium-containing porphyrins, chemicallyrelated to cytochrome andhaemoglobin.

Chlorophyll is a green pigment found in plants, algae and some bacteria. It is a complex chelate of magnesium containing porphyrins It is a magnesium complex of the phytil ester of porphyrin propionic acid. These pigments belong to the tetrapyrrole family of organic compounds. Genetic and environmental differences alter the relative amounts of chlorophyll pigment production and also produce leaves, ranging in color from dark green to yellow. The principal chlorophyll is chlorophyll-a , found in oxygenevolving organisms.
The leaf chlorophyll content is related to nitrogen nutrition; therefore, the relative chlorophyll content can serve as an indication of the nitrogen status of the plant. A hand-held chlorophyll meter provides an indication of the leaf nitrogen status of the crop.
Chlorophyll molecules have three functions. They serve as an antenna to absorb light quanta; they transmit this energy from one chlorophyll molecule to another by a process of 'resonance transfer' till finally the chlorophyll molecule, in close association with enzymes, undergoes chemical oxidation. The resulting electron of high potential is ejected from the molecule; this electron can then be made to perform biochemical work (that is, reduction of another compound). Thus, the energy of light quanta is converted to chemical energy.
Chlorophylls a, b, c, d and e, bacteriochlorophyll and bacterioviridin are all chlorophyll pigments. Chlorophyll-a and chlorophyll-b are abundant in higher plants. Chlorophyll-a contains a methyl group and chlorophyll-b contains an aldehyde group at C₃atom.