10
Question
The spectral quality of _____i______ is important for life on Earth. Components like ____ii_____ are harmful in spectrum and __________iii______ available for marine plants living deep in the oceans.
The spectral quality of _____i______ is important for life on Earth. Components like ____ii_____ are harmful in spectrum and __________iii______ available for marine plants living deep in the oceans.
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Solution
The correct option is C i - solar radiation, ii - UV radiations, iii - all colours are not
Sunlight is the ultimate source of energy on Earth. So the spectral quality of solar radiation is important for life on Earth. The solar spectrum contains different radiations like gamma rays, X-rays, UV rays, infrared rays, visible spectrum, radio waves and microwaves.
Figure : Solar spectrum
Visible spectrum (VIBGYOR) helps to see objects and is also absorbed by plants to carry out photosynthesis. But the range of wavelength is less (400 - 700 nm) and hence all colours are not able to reach the depth of oceans. Light of shorter wavelengths carry high energy (blue region) and can hence penetrate to the depths of the ocean whereas light of longer wavelengths (red region) cannot. Therefore, higher energy light or shorter wavelengths such as blue region are able to penetrate more deeply in oceans.
Figure : Sunlight availability in sea
The UV rays of the spectrum are harmful for all life forms. If these rays somehow penetrate the ozone layer of the atmosphere and reach us then they can cause skin cancer, damage to plants, cataracts, etc. Along with UV rays, gamma rays are also able to cause mutations and hence are harmful.
Infrared radiations keep Earth warm which helps in the survival of organisms. The long exposure to microwave radiation from Sun, even at very low power densities, can dehydrate the seedlings and inhibit their development. X-rays from Sun hardly reaches the surface of Earth.
Hence option c is correct.
Sunlight is the ultimate source of energy on Earth. So the spectral quality of solar radiation is important for life on Earth. The solar spectrum contains different radiations like gamma rays, X-rays, UV rays, infrared rays, visible spectrum, radio waves and microwaves.
Figure : Solar spectrumVisible spectrum (VIBGYOR) helps to see objects and is also absorbed by plants to carry out photosynthesis. But the range of wavelength is less (400 - 700 nm) and hence all colours are not able to reach the depth of oceans. Light of shorter wavelengths carry high energy (blue region) and can hence penetrate to the depths of the ocean whereas light of longer wavelengths (red region) cannot. Therefore, higher energy light or shorter wavelengths such as blue region are able to penetrate more deeply in oceans.
Figure : Sunlight availability in seaThe UV rays of the spectrum are harmful for all life forms. If these rays somehow penetrate the ozone layer of the atmosphere and reach us then they can cause skin cancer, damage to plants, cataracts, etc. Along with UV rays, gamma rays are also able to cause mutations and hence are harmful.
Infrared radiations keep Earth warm which helps in the survival of organisms. The long exposure to microwave radiation from Sun, even at very low power densities, can dehydrate the seedlings and inhibit their development. X-rays from Sun hardly reaches the surface of Earth.
Hence option c is correct.
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