981: Which of the following is the chief characteristic of 'mixed farming'?
(a) Cultivation of both cash crops and food crops
(b) Cultivation of two or more crops in the same field
(c) Rearing of animals and cultivation of crops together
(d) None of the above
982: Arrange the following in a chronological order:
(i) Surat Split
(ii) Formation of Muslim League
(iii) Partition of Bengal
(iv) Regulating Act
(a) (i). (ii), (iii), (iv)
(b) (iv), (iii), (ii), (i)
(c) (ii), (i), (iv), (iii)
(d) (ii), (iii), (iv), (i)
983: Acid rain is caused by the pollution of environment by
(a) carbon dioxide and nitrogen
(b) carbon monoxide and carbon dioxide
(c) ozone and carbon dioxide
(d) nitrous oxide and sulphur dioxide
984: Micro-elements needed to increase soil fertility are:
(a) Nitrogen, hydrogen and calcium
(b) Nitrogen, phosphorus and potassium
(c) Iron, calcium and potassium
(d) Manganese, copper and zinc
985: If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because
(a) Propagules of the trees in a rain forest have poor viability
(b) The soil of rain forest is deficient in nutrients
(c) The rain forest species are slow growing
(d) Exotic species invade the fertile soil of rain forest