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Solution for Discuss briefly about Ultraviolet B - CBSE (Science) Class 12 - Biology


Discuss briefly about Ultraviolet B

Solution 1

Ultraviolet B : Ultraviolet B is one of the three types of invisible light rays given off by the sun. Ultraviolet B penetrates the ozone layer in attenuated form & reaches earths. This is more over equator than poles due to thinning of ozone shield over equator. It causes skin cancer, reduce rate of photosynthesis in phytoplanktons, reduces diversity of aquatic ecosystem.

Solution 2

Ultraviolet-B: - Ultraviolet-B is an electromagnetic radiation which has a shorter wavelength than visible light. It is a harmful radiation that comes from sunlight and penetrates through the ozone hole onto the Earth’s surface. It induces many health hazards in humans. UV −B damages DNA and activates the process of skin ageing. It also causes skin darkening and skin cancer. High levels of UV −B cause corneal cataract in human beings.

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 NCERT Biology Textbook for Class 12 (with solutions)
Chapter 16: Environmental Issues
Q: 11.3 | Page no. 286

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Solution for question: Discuss briefly about Ultraviolet B concept: Ozone - Ozone Depletion in the Stratosphere. For the course CBSE (Science)