PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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700 nm
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680 nm
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400-500 nm
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650-750 nm
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Detailed explanation-1: -P680 is the reaction centre of photosystem II, which consists of chlorophyll a molecules with an absorption maximum at the wavelength of 680nm, or it absorbs the 680nm wavelengths the best.
Detailed explanation-2: -The chlorophyll a special pairs of the two photosystems absorb different wavelengths of light. The PSII special pair absorbs best at 680 nm, while the PSI special absorbs best at 700 nm.
Detailed explanation-3: -PS-II is attached to oxygen evolving complex and found in non-cyclic photophosphorylation only. It has max peak at 680 nm.
Detailed explanation-4: -One of them has its absorption maximum at about 683 nm and is responsible for the prominent shoulder that is present in the 10 K absorption spectra of most PSII-RC preparations.
Detailed explanation-5: -Blue (420-450nm) and Red (620-680nm): Chlorophyll b molecule has a similar structure to that of chlorophyll a. It absorbs mostly 453nm and 642 nm wavelength light, Although Chlorophyll b is not as abundant as chlorophyll a, it helps the range of light a plant can use for energy.