Water conservation and pollution : Practice Questions

Which of the following actions is a direct way to conserve water at home?

Which of the following household practices effectively combines water conservation with the goal of minimizing water pollution?

The process of eutrophication in a lake is often triggered by the runoff of phosphates and nitrates. Which of the following best describes the specific role of bacteria in the eventual depletion of dissolved oxygen during this process?

A student installs a special nozzle on a tap to decrease the flow rate while maintaining the water pressure for washing. This is a practical example of:

Untreated domestic sewage discharged directly into rivers or lakes is a major cause of water pollution. What is the primary environmental problem associated with this type of pollution?

List two major human activities that contribute directly to water pollution in rivers or lakes.

Explain the critical importance of treating wastewater before discharging it into the sea, focusing on how it protects marine ecosystems from harmful impacts.

A river flows through a rural town with several human activities along its banks: a textile factory using synthetic dyes, a large crop farm that applies nitrogen-rich chemical fertilizers, and a residential village. Recently, residents downstream have noticed that the water has turned green and many dead fish are floating on the surface.

A rapidly developing coastal city faces a dual challenge: increasing demand for freshwater and severe marine water pollution impacting its ecosystems and local industries. Despite efforts, existing solutions are proving insufficient.

(a) Identify and describe two distinct human activities, common in such a city, that significantly contribute to marine water pollution. For each activity, explain the primary type of pollutant released and its direct environmental impact on coastal waters.

(b) Beyond the direct environmental impacts, explain one significant long-term ecological consequence and one key socio-economic impact of this marine pollution on the city's coastal communities.

(c) Propose one integrated strategy that the city could implement to simultaneously address both its freshwater scarcity and marine pollution challenges. Explain how this single strategy achieves both water conservation and pollution reduction, and discuss one major practical challenge in its successful implementation.