71: To know whether the rich are getting richer and the poor getting poorer, it is necessary to compare
(a) the wholesale price index over different periods of time for different regions
(b) the distribution of income of an identical set of income recipients in different periods of time
(c) the distribution of income of different sets of income recipients at a point of time
(d) the availability of foodgrains among two sets of people, one rich and the other poor, over different periods of time
72: Which one of the following is the correct sequence of the given continents in the decreasing order of their percentage of Earth's land?
(a) North America-Africa-South America-Europe
(b) Africa-North America-South America-Europe
(c) North America-Africa-Europe-South America
(d) Africa-North America-Europe-South America
73: Wealth tax on agricultural property is levied by:
(a) Central Government
(b) State Government
(c) Both the Central and State Governments
(d) None of the above
74: Mycorrhiza is a symbiotic association between
(a) Bacteria and roots of higher plants
(b) Algae and roofs of orchids
(c) Fungi and roots of higher plants
(d) Protozoa and roots of higher plants
75: About 50% of the world population is concentrated between the latitudes of
(a) 5°N and 20°N
(b) 20°N and 40°N
(c) 40°N and 60°N
(d) 20°S and 40°S