Why do the horns of barchan and parabolic dunes point in different directions?
Answer and explanation
Correct answer: In barchans free sand moves forward while in parabolic dunes horns remain anchored by vegetation
Dune shape is controlled by wind direction, sand mobility, and vegetation. A barchan forms from a limited sand supply on a hard surface; its horns generally point downwind because the central body moves more slowly than the edges. A parabolic dune commonly develops where vegetation anchors the arms, so its horns point upwind while the sandy nose advances downwind. Hence option A is correct.
Frequently asked questions
What is the correct answer to this question?
In barchans free sand moves forward while in parabolic dunes horns remain anchored by vegetation
Why is this the correct answer?
Dune shape is controlled by wind direction, sand mobility, and vegetation. A barchan forms from a limited sand supply on a hard surface; its horns generally point downwind because the central body moves more slowly than the edges. A parabolic dune commonly develops where vegetation anchors the arms, so its horns point upwind while the sandy nose advances downwind. Hence option A is correct.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Trial Balance and Rectification of Errors.
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