Ans: (a)
21. The phenomenon by which water molecules move from a weaker solution to a stronger solution through a semi-
    permeable membrane is called: [NDA 2004]
    (a) Diffusion
    (b) Osmosis
    (c) Transpiration
    (d) Translocation
Ans: (b)
22. In the human eye, the focusing is done by : [NDA 2004]
    (a) to and fro movement of the eye lens
    (b) to and fro movement of the retina
    (c) change in the convexity of the eye lens
    (d) change in the refractive index of the eye fluids
Ans: (a)
23. Match the following: [CDS 2004]
    Disease                 Organism
    A. Cholera              1. Bacterium
    B. Mumps                2. Fungus
    C. Ringworm             3. Protozoa
    D. Sleeping sickness    4. Virus
         A         B        C         D
    (a)  1         4        2         3
    (b)  1         2        4         3
    (c)  3         4        2         1
    (d)  3         2        4         1
Ans: (a)
24. Consider the following vitamins: [CDS 2004]
    1) Niacin
    2) Pyridoxin
    3) Riboflavin
    4) Thiamine
    Which of these are water-soluble vitamins?
    (a)  1, 2 and 3
    (b)  2, 3 and 4
    (c)  1 and 4
    (d)  1, 2, 3 and 4
Ans: (d)
25. Match the following: [IAS 1998]
    A. Theory of Mutation                      1. Beadk and Tatum
                                                          575