1. (a) Population density is the number of persons per unit area. (b) 324 persons per sq. km

    (a) Population density is the number of persons per unit area.
    (b) 324 persons per sq. km

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  2. In the Thar Desert, the day temperature may rise to 50" C and drop down to near 15° C in the same night. It is due to the fact that it is an undulating sandy plain covered with sand dunes. It has arid climate with low vegetation cover and the weather conditions drastically change during the day andRead more

    In the Thar Desert, the day temperature may rise to 50″ C and drop down to near 15° C in the same night. It is due to the fact that it is an undulating sandy plain covered with sand dunes. It has arid climate with low vegetation cover and the weather conditions drastically change during the day and the night.

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  3. (i) The mid-western prairie was covered with a thick mat of grass with tough roots. New ploughs broke the sod and turned the soil over. By the early twentieth century, farmers in Great Plains broke the ground with tractors and disk ploughs, cleared vast stretches for wheat cultivation. (ii) MechanicRead more

    (i) The mid-western prairie was covered with a thick mat of grass with tough roots. New ploughs broke the sod and turned the soil over. By the early twentieth century, farmers in Great Plains broke the ground with tractors and disk ploughs, cleared vast stretches for wheat cultivation.
    (ii) Mechanical harvesting machines helped in cutting grain quickly. Earlier hundreds of men and women could be seen in the fields. By the early twentieth century, most farmers were using combined harvesters to cut grain.
    (iii) New machines allowed big farmers to rapidly clear large tracts, break up soil, remove the grass and prepare the ground for cultivation. With power-driven machinery, four men could plough, seed and harvest 2000 to 4000 acres of wheat in a season.

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