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Q.

Read the source given below and answer the question that follows.


The Indian desert lies towards the western margins of the Aravalli Hills. It is an undulating sandy plain covered with sand dunes. This region receives very low rainfall below 150 mm per year. It has an arid climate with low vegetation cover. Streams appear during the rainy season. Soon after, they disappear into the sand as they do not have enough water to reach the sea. Luni is the only large river in this region. Barchans (crescent-shaped dunes) cover larger areas but longitudinal dunes become more prominent near the Indo-Pakistan boundary. If you visit Jaisalmer, you may go to see a group of barchans.


Answer the MCQs by choosing the appropriate option.


Barchans are [[1]] shaped dunes.


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Detailed Solution

Barchans are Crescent-shaped dunes. Barchan often spelt Barkhan, is a crescent-shaped dune formed by wind blowing in a single direction. It is one of the most prevalent dunes that can be found in sandy deserts all over the world. The horns of the crescent point downwind and mark the lateral advancement of the sand. Barchans are convex facing the wind, with the horns of the crescent pointing downwind. In cross-section, these dunes are asymmetrical, with a mild slope facing the wind and a significantly steeper slope facing away from the wind, known as the slip face.
 
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Read the source given below and answer the question that follows.The Indian desert lies towards the western margins of the Aravalli Hills. It is an undulating sandy plain covered with sand dunes. This region receives very low rainfall below 150 mm per year. It has an arid climate with low vegetation cover. Streams appear during the rainy season. Soon after, they disappear into the sand as they do not have enough water to reach the sea. Luni is the only large river in this region. Barchans (crescent-shaped dunes) cover larger areas but longitudinal dunes become more prominent near the Indo-Pakistan boundary. If you visit Jaisalmer, you may go to see a group of barchans.Answer the MCQs by choosing the appropriate option.Barchans are [[1]] shaped dunes.