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If the Earth were a flat disc instead of a sphere, how would the patterns of solar radiation and temperature be different?
If the Earth were a flat disc oriented toward the Sun, solar rays would strike the entire surface at identical perpendicular angles, delivering uniform insolation everywhere. Consequently, the sharp temperature gradients between the equator and poles would disappear. The absence of differential heatRead more
If the Earth were a flat disc oriented toward the Sun, solar rays would strike the entire surface at identical perpendicular angles, delivering uniform insolation everywhere. Consequently, the sharp temperature gradients between the equator and poles would disappear. The absence of differential heating would eliminate global planetary pressure belts, standard wind circulation cells and traditional planetary climatic zones.
For more NCERT Solutions of Class 9 Science Exploration Chapter 13 Earth as a System: Energy, Matter and Life Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-13/
See lessWhy is an excess of CO₂ in the atmosphere considered undesirable even though it is required by plants?
Although plants utilize carbon dioxide for photosynthesis, excessive atmospheric concentrations intensify the greenhouse effect, causing unmanageable global warming. This thermal disruption triggers extreme weather, shifts monsoon rainfall and melts polar glaciers, causing coastal flooding. FurthermRead more
Although plants utilize carbon dioxide for photosynthesis, excessive atmospheric concentrations intensify the greenhouse effect, causing unmanageable global warming. This thermal disruption triggers extreme weather, shifts monsoon rainfall and melts polar glaciers, causing coastal flooding. Furthermore, excess atmospheric carbon dissolves into oceans, producing ocean acidification that damages coral reefs and marine phytoplankton ecosystems.
For more NCERT Solutions of Class 9 Science Exploration Chapter 13 Earth as a System: Energy, Matter and Life Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-13/
See lessExplain with suitable diagram the path that carbon takes to go back to the atmosphere. You may start from plants using CO₂ from the atmosphere.
Plants absorb atmospheric carbon dioxide to synthesize organic carbohydrates via photosynthesis. Carbon then returns to the atmosphere through three primary pathways: direct respiration by plants and consuming animals, aerobic decomposition of organic waste and dead biomass by soil microorganisms anRead more
Plants absorb atmospheric carbon dioxide to synthesize organic carbohydrates via photosynthesis. Carbon then returns to the atmosphere through three primary pathways: direct respiration by plants and consuming animals, aerobic decomposition of organic waste and dead biomass by soil microorganisms and the combustion of wood, peat and ancient subterranean fossil fuel reserves (coal, petroleum and natural gas).
For more NCERT Solutions of Class 9 Science Exploration Chapter 13 Earth as a System: Energy, Matter and Life Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-13/
See lessWhat are the impacts of deforestation on the Earth’s oxygen and carbon cycles? What are the other consequences of deforestation?
(i) Impacts on carbon and oxygen cycles: Clearing forests reduces atmospheric oxygen replenishment via photosynthesis and eliminates critical carbon sinks, leaving excess carbon dioxide to accumulate and accelerate global warming. (ii) Broader environmental consequences: Deforestation disrupts regioRead more
(i) Impacts on carbon and oxygen cycles: Clearing forests reduces atmospheric oxygen replenishment via photosynthesis and eliminates critical carbon sinks, leaving excess carbon dioxide to accumulate and accelerate global warming. (ii) Broader environmental consequences: Deforestation disrupts regional water cycles by reducing transpiration, accelerates destructive topsoil erosion due to the absence of binding roots and causes severe biodiversity loss.
For more NCERT Solutions of Class 9 Science Exploration Chapter 13 Earth as a System: Energy, Matter and Life Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-13/
See lessExplain the processes involved in the nitrogen cycle. How would life on Earth be affected if nitrogen were not cycled?
(i) Cycle processes: Atmospheric nitrogen is fixed into ammonia by bacteria, oxidized to nitrites and nitrates by nitrifying microbes, assimilated into plant proteins, decomposed into ammonia and converted back into nitrogen gas by denitrifying bacteria. (ii) Ecological impact: Without cycling, usabRead more
(i) Cycle processes: Atmospheric nitrogen is fixed into ammonia by bacteria, oxidized to nitrites and nitrates by nitrifying microbes, assimilated into plant proteins, decomposed into ammonia and converted back into nitrogen gas by denitrifying bacteria. (ii) Ecological impact: Without cycling, usable nitrogen compounds would exhaust completely from soils, halting protein and nucleic acid production across all plants and causing food webs to collapse.
For more NCERT Solutions of Class 9 Science Exploration Chapter 13 Earth as a System: Energy, Matter and Life Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-13/
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