The correct answer is ultraviolet radiation.Concept:Ozone layer:It is a layer of ozone molecules found in the stratosphere (the second layer of the atmosphere).Ozone is a molecule made up of three oxygen atoms, often referenced as O3.Explanation:Importance of Ozone layer:The presence of ozone in the stratosphere prevents about 99.5 percent of the suns harmful ultraviolet (UV) radiations from reaching the earths surface.Thus, protecting humans and other animals from its effect.Harmful effects of UV Radiations:They lead to aging of the skin, cataracts, sunburn, skin cancer, the killing of many phytoplanktons, damage to fish productivity, etc.It has also been reported that plant proteins get easily affected by UV radiation which leads to the harmful mutation of cells.It also increases the evaporation of surface water through the stomata of the leaves and decreases the moisture content of the soil.Additional InformationElectromagnetic spectrum:?X-rays:X-rays have higher energy and can pass through most objects, including the body.Medical x-rays are used to generate images of tissues and structures inside the body.Gamma rays:Gamma rays have the smallest wavelengths and the most energy of any wave in the electromagnetic spectrum.They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes. Infrared rays:Infrared radiation is a type of radiant energy that's invisible to human eyes but that we can feel as heat.IR is a type of electromagnetic radiation produced when atoms absorb and then release energy.RadiationRange of wavelengthsTypical wavelength ? Increasing wavelength DecreasingEnergy DecreasingfrequencyGamma10-16 m €œ 10-10 m10-15 mX-Rays10-13 m €œ 10-8 m10-10 mUV10-8 m €œ 400 nm10-8 mVisible Light400 nm €œ 700 nm Infra-red700 nm €œ 10-3 m10-5 mMicrowaves10-3 m €œ 10-1 m10-2 mRadio waves10-1 m €œ 106 m102 m