686: The distribution of powers between the Centre and the States in the Indian Constitution is based on the scheme provided in the
(a) Morley-Minto Reforms, 1909
(b) Montagu-Chelmsford Act, 1919
(c) Government of India Act, 1935
(d) Indian Independence Act, 1947
687: Which one of the following terms describes not only the physical space occupied by an organism, but also its functional role in the community of organisms?
(a) Ecotone
(b) Ecological niche
(c) Habitat
(d) Home range
688: To check the expansion of Thar desert which of the following measures should be used?
(a) Construction of dams
(b) Afforestation
(c) Construction of canals
(d) Artificial rain
689: The missing fraction in the series given below is :
4/9,9/90/........39/86
(a) 17/40
(b) 19/42
(c) 20/45
(d) 29/53
690: A major health mission carried in 1996 was
(a) war against leprosy
(b) small-pox eradication
(c) pulse polio immunization
(d) popularisation of oral rehydration therapy