Why photosynthesis is maximum in red light,medium in blue light?Explain in detail
Asked by abinash.gupta003 | 29 Apr, 2017, 08:52: AM
Expert Answer
Photosynthesis occurs when pigments, molecules in the plant cell, absorb light photons and transfer them around to create chemical energy. These pigments are specific in terms of which light they can use. There are two types of Chlorophyll pigments, A and B. Chlorophyll A absorbs a lot of red light and some blue while Chlorophyll B absorbs a lot of blue and some red. Therefore, this pigment absorbs red light the best, and converts the light into energy that it uses for metabolism.
Answered by Sivanand Patnaik | 01 May, 2017, 11:18: AM
Maximum absorption of light by chlorophyll a occurs in red and blue regions of the absorption spectrum. So that, the rate of photosynthesis is maximum in red and blue light of the visible spectrum. Minimum photosynthesis takes place in the green light.
When light having a wavelength ranging between 400-and 700 nm is absorbed by the plant, the rate of photosynthesis is the highest. Red light is absorbed effectively by chlorophyll which ranges within this wavelength. It is utilized in the maximum amount.
Blue light plays an important role in most plant functions. Blue light is highly absorbed by both chlorophyll a and b, as well as an intact leaf system. This high absorption rate corresponds to the photosynthetic action spectrum from isolated chloroplasts and intact leaves.
The rate of photosynthesis is maximum in red light. This was proved by the Emerson enhancement effect that states that there is an increase in the rate of photosynthesis when the chloroplast is exposed to a light of wavelength 680 nm and 700 nm.
Explanation: Photosynthesis is maximum in the Red colour of Light and Least in the Green colour of Light. In the absorption spectrum, the red & blue lights are absorbed while the majority of green light gets reflected. Photosynthesis range from 400 to 700 nm, It absorbs the Violet, Blue and Red colour of Light.
Although red light components have a great potential for use as a light source to drive photosynthesis, plants are adapted to utilize a wide-spectrum of light to control photosynthesis [9].
Since red and blue light are absorbed more strongly by photosynthetic pigments than green light, they are predominantly absorbed by the top few cell layers, while green light can penetrate deeper into leaf tissues (Nishio, 2000; Vogelmann and Evans, 2002; Terashima et al., 2009; Brodersen and Vogelmann, 2010), thus ...
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