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प्रश्न
Oxygen is returned to the atmosphere mainly by
पर्याय
burning of fossil fuel
respiration
photosynthesis
fungi
उत्तर
photosynthesis
Explanation:
Agents in other options return carbon dioxide to the atmosphere.
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संबंधित प्रश्न
What are the major causes of water pollution? Explain.
Clear, transparent water is always fit for drinking. Comment.
Answer the following question:
Name two human diseases caused due to water pollution.
What are some types of pollutants found in water?
Fill in the Blanks:
Sewage is the source of ______ pollution
With reference to the sources of water pollutants answer the following question:
Why is it harmful to dispose of household detergents in water bodies?
With reference to the sources of water pollutants answer the following question:
In what way does the industrial waste pollute water?
With reference to the sources of water pollutants answer the following question:
How do the radioactive wastes get into the water bodies?
Read the paragraph and answer the questions following it.
Water is essential for life. Without water there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called as point source, e.g. municipal and industrial discharge pipes, where pollutants enter the water source. Non-point sources of pollution are those where a source of pollution cannot be easily identified, e.g. agricultural run-off, acid rain, etc.
- How do you classify the various sources of water pollution?
- What are the point sources of water pollution?
- Name any two non-point sources of water pollution?
What could be the harmful effects of improper management of industrial and domestic solid waste in a city?
