Statement I : Skin cancer is generally caused by the ultraviolet radiation. Statement I : Stratosphere allows ultraviolet radiation to enter the earth from the sun.

Statement I is true as ultraviolet (UV) radiation, particularly UV-B, is a primary cause of skin cancer in humans by damaging genetic material (DNA) and inducing mutations [7]. Statement II is false because the stratosphere does not 'allow' UV radiation to enter; rather, it contains the ozone layer which acts as a shield [4]. This layer absorbs nearly all harmful UV-C and approximately 90% of UV-B radiation, preventing most of it from reaching the Earth's surface [2]. While some UV-A and a small fraction of UV-B do penetrate the atmosphere, the primary function of the stratosphere's ozone is to block, not allow, these harmful rays [5]. Therefore, Statement I is a scientifically accurate health fact, while Statement II misrepresents the atmospheric role of the stratosphere in filtering solar radiation.

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 19: Ozone Depletion > OTSNE $$FUETION > p. 267
2. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 20: Earths Atmosphere > Ozone (O3) > p. 272
3. [7] https://www.sciencedirect.com/topics/immunology-and-microbiology/ultraviolet-b-radiation
4. [4] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 1: BASIC CONCEPTS OF ENVIRONMENT AND ECOLOGY > Structure of the Atmosphere > p. 8
5. [2] Science , class X (NCERT 2025 ed.) > Chapter 13: Our Environment > 13.2.1 Ozone Layer and How it is Getting Depleted > p. 213
6. [5] https://ozone.unep.org/ozone-and-you