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What structure below an aquifer can prevent groundwater from moving farther downward?

Answer and explanation

Correct answer: अपारगम्य चट्टान या आधारशैल (Impermeable rock or bedrock)

Correct answer: B, an impermeable rock layer or bedrock. An aquifer is a permeable underground layer that can store and transmit groundwater. If a low-permeability or impermeable layer lies beneath it, water cannot pass through that layer easily. The water may therefore accumulate above the barrier and remain stored in the aquifer, although groundwater can still move sideways or slowly through some materials. A, sand, is usually porous and permeable, so water can pass through it. C, air-filled pores are spaces within soil or rock, not a solid barrier; when water enters, air may be displaced. D, roots can absorb some water and influence soil structure, but they do not form a continuous underground seal. Memory cue: “aquifer stores and transmits; impermeable rock blocks downward flow.”

Related tags

AquiferImpermeable-RockGroundwaterHydrological CycleThe Living WorldBiologyClass 11 Mcq

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