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प्रश्न
71% of earth surface is covered with:
विकल्प
Land
Air
Water
Coal
उत्तर
Water
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संबंधित प्रश्न
What are the common sources of oil spills?
Name two heavy metals from industries that pollute water.
With reference to the sources of water pollutants answer the following question:
In what way does the industrial waste pollute water?
We should save water.
Excessive use of chemical fertilizers depletes the soil and causes water pollution.
Dissolved oxygen in water is responsible for aquatic life. What processes are responsible for the reduction in dissolved oxygen in water?
Mention the standards prescribed by BIS for quality of drinking water.
What are the major sources of Water pollution?
A pond contains clean water. Which of the following activities will produce least pollution of water?
Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes:
(i) enhanced growth of algae.
(ii) decrease in amount of dissolved oxygen in water.
(iii) deposition of calcium phosphate.
(iv) increase in fish population.
