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The most plausible explanation for the location of the Thar desert in western India is

  • A.the obstruction caused by the Aravalis to the rain-bearing wind that proceeds to the Ganga Valley
  • B.the evaporation of moisture by heat
  • C.the absence of mountains to the north of Rajasthan to cause orographic rainfall in it
  • D.that the moisture carried by the South-west monsoon is driven away by the dry upper air current

Answer: C

The best explanation is the absence of mountains north of Rajasthan to cause the monsoon to shed its moisture there.

The Aravallis run parallel to the path of the Arabian Sea branch of the monsoon rather than across it, so they do not force the air to rise. With no barrier lying athwart the wind, the moisture is carried past Rajasthan without being precipitated.

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