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प्रश्न
What is global warming? Give its effects.
उत्तर
The heating up of the atmosphere because of the greenhouse gases (carbon dioxide and methane) that trap the heat reflected by the Earth, thereby causing an increase in the Earth's temperature, is called global warming or greenhouse effect.
Effects of global warming:
(i) It causes change in the weather and precipitation patterns on the Earth.
(ii) It leads to an increase in methane concentration because of the melting of methane hydrates in polar ice caps and sea floors.
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संबंधित प्रश्न
What are the possible dangers of global warming?
Complete the following table (Carefully study the carbon, oxygen, and nitrogen cycles).
| Bio-geo-chemical cycles | Biotic processes | Abiotic processes |
| 1. Carbon cycle | ||
| 2. Oxygen cycle | ||
| 3. Nitrogen cycle |
Correct and rewrite the following statement and justify your correction.
The flow of nutrients in an ecosystem is considered to be a ‘one-way’ transport.
Give reason.
Equilibrium is necessary in the various bio-geo-chemical cycles.
What would you do to help maintain the equilibrium in the various bio-geo-chemical cycles? Explain in brief.
Explain the following with suitable examples.
What are the differences between the flow of matter and of energy in an ecosystem? Why?
What are the two factors of biosphere?
Tropical grasslands are also known as ______.
Oxygen combines with iron found in the rocks to form ____.
What are bio-geochemical cycles? Explain how nitrogen is fixed in the atmosphere.
