62. (i) A membrane that surrounds the foetus and secretes a protective fluid.   63. (ii) Protective coverings of the brain and spinal cord.   64. (iii) A statistical study of human population.   65. (iv) Substances that are applied to the surroundings where germs thrive and and multiply.   66. (v) The inward movements of solvent molecules through the plasma membrane of a cell.   67. (vi) Loss of water in the form of droplets from the margin of a leaf.   68. (vii) Adjustment of the eyes in the order to obtain a clear vision of object at different distances.   69. (viii) The small amount of inhaled air in the respiratory tract that does not take part in gaseous exchange.