Question

SECTION - B
• 1) What can we conclude from the statement that the action and absorption
spectrum of photosynthesis overlap? At which wavelength do they show
peak?
II) Why is the rate of photosynthesis higher in the red and blue regions of
the spectrum of light?​

Answer 1

Answer:

1. Red and Blue Light have maximum energy which a chlorophyll pigment absorbs and get excited and initiate the process of photosynthesis. Also, its wavelength are (400-700 nm) i.e., between the Photosynthetic Active Radiation (PAR). Thus, the rate of photosynthesis is higher in blue and red light.

2. The action spectrum is the graph plotted with the rate of photosynthesis as a function of wavelength. Since, the amount of light absorbed and the rate of photosynthesis have a direct relationship, the two curves overlap. They show peaks around wavelengths 450 nm (blue region) and 650-680 nm (red region)

In conclusion, plant leaves are green because green light is less efficiently absorbed by chlorophylls a and b than red or blue light, and therefore green light has a higher probability to become diffusely reflected from cell walls than red or blue light. Chlorophylls do not reflect light.

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