List-I | List-II | ||
(A) | Preventive checks | (I) | Number of females per 1000 males in a given area at a specified time period |
(B) | Positive checks | (II) | Estimated number of years that an average person is expected to survive |
(C) | Life expectancy | (III) | Voluntary action to reduce population (like postponing marriage) |
(D) | Sex-ratio | (IV) | Involuntary events to reduce population (like famine) |