Geography
Assertion (A): Barchan are moon-shaped live dunes.
Reason (R): The migration of the barchans is a threat to desert life.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
- A is false but R is true.
Denundation
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Answer
Both A and R are true but R does not explain A.
Explanation — Barchans are moon-shaped live dunes which advance steadily before winds that blow from a particular direction. The migration of the barchans is a threat to desert life as they sometimes encroach on an oasis, burying palm trees or houses.
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Related Questions
Which amongst the following is not a factor affecting work of a river?
- Velocity of water
- Quality of water
- Volume of water
- Load of water
How do migratory dunes damage towns and villages?
- They cover all surfaces with thick layers of sand.
- The large mass of sand shifts further.
- They can be checked by building walls.
- All of the above.
Name the landform that is formed as a result of the action of wind wherein loose materials are lifted and blown off to be deposited outside the desert margins.
- Sand Dunes
- Barchans
- Deflation Hallows
- Seifs
See the below figure of a barchan and identify the direction of the wind.
- A
- B
- Both A and B
- Neither A nor B.