question_answer 27)

  Excessive exposure of humans to UV-rays results in (i) damage to immune system                                   (ii) damage to lungs (iii) skin cancer                                                                  (iv) peptic ulcers (a) (i) and (ii)                      (b) (ii) and (iv)                   (c) (i) and (iii)                     (d) (iii) and (iv)

Answer:

                  (c)The UV-rays have extremely harmful effects on human beings, other animals as well as plants. It can cause skin cancer, damage the eyes by causing cataract, also damage immune system by lowering the body's resistance to diseases.