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प्रश्न
Assertion (A): The Tundra region experiences the brilliant Aurora display of lights.
Reason (R): Aurora display occurs due to the presence of dust particles in the air.
विकल्प
Both A and R are true, and R is the correct reason for A.
Both A and R are true, but R is not the correct reason for A.
A is true, and R is false.
A is false, and R is true.
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उत्तर
A is true, and R is false.
Explanation:
The tundra (high‑latitude polar) regions do see brilliant auroral displays (Aurora Borealis/Australis). The reason given is incorrect. Auroras are produced when charged particles from the solar wind are guided by Earth’s magnetic field into the upper atmosphere, where they collide with and excite oxygen and nitrogen atoms and molecules; the subsequent emissions produce the characteristic green, red, blue, and purple lights. Dust particles in the air do not cause auroras (dust can scatter sunlight and affect sunsets, but it is not the mechanism behind auroral light).
