2)   Covering both sides of a leaf with a plastic film will reduce both stomatal and cuticular transpiration.
         3)   Injecting detergents (which lower the surface tension of water) into the xylem of tree trunk could prevent water
              from reaching the upper branches.
         4) Along most of its route through a plant, water moves by diffusion either along cell walls or across protoplasts.
    (a)  1, 2 and 3
    (b)  1, 2 and 4
    (c)  1, 3 and 4
    (d)  2, 3 and 4
Ans: (b)
38. The largest flower in the world is that of:
    (a) Lotus
    (b) Rafflesia
    (c) Giant cactus
    (d) None of these
Ans: (b)
39. When a colourbiind male marries a normal woman not carrying the gene for Colour blindness, their offsprings will be :
    [lES 1992]
    (a) normal sons and normal daughters
    (b) normal sons and carrier daughters
    (c) normal daughters and colourblind sons
    (d) colourblind sons and carrier daughters
Ans: (b)
40. Which of the following practices enhance the nutrient content of food?
         1) Deep frying
         2) Fermentation
         3) Sprouting
    (a) 1 and 2
    (b) 1 and 3
    (c) 2 and 3
    (d) 1, 2 and 3
Ans: (c)
41. DPT is a vaccine for:
    (a) diarrhoea, polio and typhoid
    (b) diphtheria, whooping cough and tetanus
    (c) diarrhoea, polio and tetanus
    (d) diphtheria, whooping cough and typhoid
Ans: (b)
42. Which one of the following sets is correctly matched? [IAS 1995]
    (a) Diphtheria, Pneumonia and Leprosy: Hereditary
    (b) AIDS, Syphilis and Gonorrhoea : Bacterial
    (c) Colour blindness, Haemophilia and Sickle cell anaemia: Sex linked
    (d) Polio, Japanese B ancephalitis and Plague: Viral
Ans: (c)
43. Which of the following symptoms are most likely to be observed in a person suffering from scurvy?
         1) Swelling and bleeding of gums.
         2) Dry and scaly skin.