Earth as a System: Energy, Matter, and Life
Class 9 · Science · 22 Questions
If the Earth were a flat disc instead of a sphere, how would the patterns of solar radiation and temperature be different?
How does the cool mountain breeze benefit agriculture activity, particularly the crops and soil?
What happens to the warm surface of water from the equator as it travels toward the poles? What impact does this movement have on the area?
What would happen to plants and animals on Earth if the biogeochemical cycles were disrupted and stopped? Explain by giving a few examples.
Discuss how human activities increase the concentration of greenhouse gases in the atmosphere. What would you do as an individual to reduce the emission of greenhouse gas?
Choose the most appropriate option to describe the role of biogeochemical cycles in an ecosystem.
Which of the following is primarily responsible for warming of the Earth?
Explain how climate change affects the water cycle. Illustrate with examples.
Describe how albedo affects the Earth’s surface temperature and its climate.
How are mountain and valley breezes formed? Suppose there are two mountains, one covered with grass and another covered with barren rocks; would the temperature of the two mountain breezes be different? If so, how?
You have witnessed weather phenomena, such as winds, storms, rainfall, etc. Which atmospheric layer is mainly responsible for such phenomena and what is the primary reason for its occurrence?
Explain the processes involved in the nitrogen cycle. How would life on Earth be affected if nitrogen were not cycled?
What are the impacts of deforestation on the Earth’s oxygen and carbon cycles? What are the other consequences of deforestation?
Explain with suitable diagram the path that carbon takes to go back to the atmosphere. You may start from plants using CO₂ from the atmosphere.
Why is an excess of CO₂ in the atmosphere considered undesirable even though it is required by plants?
How is heat lost from the surface of the Earth? What is its significance?
Suppose there is a rise in atmospheric temperature on Earth. How would this affect the cryosphere, hydrosphere and biosphere?
Explain how the Earth’s atmosphere helps in maintaining a suitable temperature for life to survive on the Earth.
Describe the interrelationship between different spheres of the Earth. Illustrate with example how these spheres function in a delicate balance.
Consider two hypothetical Earth-sized planets that have an atmosphere. Assume that one planet is entirely covered by oceans and the other is entirely by land. Knowing that the Sun heats the equator more than the poles, how would the wind patterns on these planets compare with the wind systems we observe on Earth, with its combination of land and sea?