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Why did the Terai region historically have high biodiversity and dense forests?

Answer and explanation

Correct answer: Because moisture, waterlogging and fertile deposits occur here

The direct answer is B: moisture, waterlogging and fertile deposits occur there. The Terai is a wet belt lying south of the Bhabar region near the Himalayan foothills. Streams that disappear into the porous Bhabar reappear in the Terai, making the ground damp and sometimes waterlogged. Step by step: abundant water creates moisture; poor drainage allows waterlogging; rivers also leave fertile deposits; together these conditions support thick vegetation and many animal and plant species. Option A is wrong because an extremely dry, rocky region cannot normally support dense forests. Option B is correct because wet soil, water availability and alluvium provide suitable habitats and nutrients. Option C is wrong because permanent lava lakes are volcanic features and are not the reason for Terai biodiversity. Option D is wrong because marine corals require suitable shallow sea conditions, whereas the Terai is a continental land belt. Some natural forests have been cleared by people, but historically the wet conditions explain the dense forests. Memory cue: Terai means a damp, marshy belt below the Himalayan foothills.

Related tags

TeraiBiodiversityMoisture

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