Answer:
(a) The effectiveness
of different wavelengths of light on photosynthesis is measured and the rate of
photosynthesis is plotted. This is called the action spectrum of
photosynthesis.
(b) Absorption of
different wavelengths of light by a particular pigment is plotted and the graph
is called the absorption spectra of that pigment.
(c)
Chlorophyll-a is responsible for light reaction of photosynthesis, but the
action spectrum and absorption spectrum do not overlap because, though
chlorophyll-a is the main pigment responsible for absorption of light, other
thylakoid pigments like chlorophyll-b, xanthophylls, carotenoid, which are
accessory pigments, also absorb and transfer the energy to chlorophyll-a.
Indeed they
not only enable a wider range of wavelength of incoming light to be utilized for
photosynthesis but also protect chlorophyll-a from photo oxidation.
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