What inferences can be drawn by observing the action spectrum of photosynthesis and absorption spectra of pigments of leaf?
I. In a higher plant, the photosynthetic rate is more at blue and red wavelengths of light.
II. The photosynthetic rate is more between the wavelengths of 500 to 600nm than between 600 to 680 nm
III. Photosynthetic rate suddenly declines at longer wavelength of red light near 700nm.
IV. Higher rates of photosynthesis is seen wherever light absorption maxima for chlorophyll a are observed.

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I, II and III

II, III and IV

I, III and IV

Only I and IV

answer is C.

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Detailed Solution

If action spectrum of photosynthesis and absorption spectra of leaf pigments are compared one can understand that

In a higher plant, the photosynthetic rate is more at blue and red wavelengths of light.
The photosynthetic rate is lesser between the wavelengths of 500 to 600nm than between 600 to 680 nm
Photosynthetic rate suddenly declines at longer wavelength of red light near 700nm.
Higher rates of photosynthesis is seen wherever light absorption maxima for chlorophyll a are observed

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