The correct answer is All the above. Explanation & Key Takeaways: Impacts of ozone depletion • It has been found by scientific experimentations that exposure of humans and experimental animals to UV-B radiation-induced due to ozone depletion can modify the immune system both at the site of exposure (locally) as well as systemically, mainly by decreasing cellular immune responses. Hence (a) is correct. • Ozone depletion-induced UV-B 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 Hence (b) is correct. • The ozone depletion-related stratospheric cooling has taken place at the same time that greenhouse gas amounts in the lower atmosphere (troposphere) have risen. Hence (c) is correct. • The two phenomena may be linked but no empirical relation has substantively been established to prove so. • Furthermore, UV-B radiation induced by ozone depletion can damage the cornea leading to photokeratitis or “snow blindness”, and can also cause cataracts through damage to the lens and the retina. Hence (d) is correct.