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In which situation will development based on river resources be considered unsustainable?

Answer and explanation

Correct answer: When withdrawal pollution and encroachment exceed river capacity

The direct answer is A: development is unsustainable when withdrawal, pollution, and encroachment exceed the river’s capacity. Every river has limits. It can provide only a certain amount of water, absorb only a limited pollution load, and support only a limited amount of construction without losing ecological functions. If people take more water than the river can naturally supply, release untreated waste, or occupy floodplains and natural banks, river health declines. This can reduce flow, destroy habitats, increase flooding risk, and harm communities. Option A correctly combines these pressures and the idea of carrying capacity. Option B, regulated water use, is a protection measure rather than an unsustainable condition. Option C, treating waste, reduces pollution and supports sustainability. Option D, protecting banks, helps prevent erosion and destructive encroachment. The correct test is whether human use stays within ecological limits over time. Memory cue: beyond carrying capacity means development cannot last.

Related tags

Unsustainable DevelopmentRiver CapacityConservation

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