what does excitation of chlorophyll mean..??
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Chlorophylls absorb light most strongly in the blue portion of the electromagnetic spectrum as well as the red portion.Conversely, it is a poor absorber of green and near-green portions of the spectrum, which it reflects, producing the green color of chlorophyll-containing tissues. Two types of chlorophyll exist in the photosystems of green plants: chlorophyll a and b.
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We shall deal here with energy transfer between different pigments ("heterogeneous" transfer), as well as with transfer between identical molecules ("homogeneous" transfer). The latter can be repeated many times, giving rise to energy migration. Direct evidence of energy transfer between different pigments is provided by sensitized fluorescence. Light quanta absorbed by molecules of one pigment (for example, chlorophyll b) are transferred to molecules of another pigment (for example, chlorophyll a). When the first pigment is excited, only fluorescence of the second is observed. This phenomenon, of sensitized fluorescence, is well known from studies on gases and solutions. The occurrence of heterogeneous energy transfer from various pigments to chlorophyll a is inferred from the action spectra (or "excitation spectra") of chlorophyll a fluorescence in vivo.