Question

what is ozone layer?point out the negative impacts of ultraviolet rays?​

Answer 1

Answer:

In particular, the ozone layer protects us from the UV radiation, known as UV-B, which causes sunburn.

Ozone layer depletion increases the amount of UVB that reaches the Earth's surface. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development.

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Mudit Vaishnav

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Answer 2

Ozone is a colourless and very reactive gas that can be found throughout all layers of our atmosphere. Most ozone (about 90%) is found in the stratosphere, which begins at about 10–16 kilometres above Earth’s surface and extends to an altitude of about 50 kilometres.

Reduced ozone levels as a result of ozone depletion mean less protection from the sun’s rays and more exposure to UVB radiation at the Earth’s surface. Studies have shown that in the Antarctic, the amount of UVB measured at the surface can double during the annual ozone hole.

Effects on Human Health:

Ozone layer depletion increases the amount of UVB that reaches the Earth’s surface. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development. In addition, UVB has been linked to the development of cataracts, a clouding of the eye’s lens.

Effects on Plants:

UVB radiation affects the physiological and developmental processes of plants. Despite mechanisms to reduce or repair these effects and an ability to adapt to increased levels of UVB, plant growth can be directly affected by UVB radiation.

Indirect changes caused by UVB (such as changes in plant form, how nutrients are distributed within the plant, timing of developmental phases and secondary metabolism) may be equally or sometimes more important than damaging effects of UVB. These changes can have important implications for plant competitive balance, herbivory, plant diseases, and biogeochemical cycles.

Effects on Materials:

Synthetic polymers, naturally occurring biopolymers, as well as some other materials of commercial interest are adversely affected by UVB radiation. Today's materials are somewhat protected from UVB by special additives. Yet, increases in UVB levels will accelerate their breakdown, limiting the length of time for which they are useful outdoors.