- Ozone depletion in the stratosphere leads to an increase in harmful UV-B radiation reaching the Earth's surface. - Increased UV-B radiation can damage plant DNA, reduce photosynthesis, and alter plant morphology, leading to stunted growth and reduced biomass (option b). This is a direct ecological impact on primary producers. - UV-B radiation can suppress the immune systems of humans and animals (option a), making them more susceptible to infectious diseases. This is an impact on organisms within the ecosystem. - Increased UV- B radiation causes eye damage like cataracts (option d) and skin damage, including cancer, in humans and animals. These are health impacts on organisms within the ecosystem. - Ozone depletion itself does not directly cause a significant rise in global surface temperature (option c). Greenhouse gases like CO2 are the primary drivers of global warming. Ozone is a greenhouse gas, and its depletion in the stratosphere has a minor cooling effect, while increased tropospheric ozone (a pollutant) has a warming effect. - Considering "ecological impacts" to include effects on organisms within the ecosystem, (a), (b), and (d) are valid impacts of increased UV-B. However, option (c) is incorrect. Given the options, only option A contains two valid impacts ((a) and (b)) and excludes the incorrect one (c). Options B, C, and D include the incorrect statement (c).