• (A) Increase in oxygen level due to photosynthesis
• (B) Excess growth of algae due to nutrient enrichment
• (C) Freezing of water in lakes
• (D) Evaporation of water from oceans

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• (A) Reflection of sunlight by clouds
• (B) Heating of Earth due to trapping of outgoing infrared radiation by gases
• (C) Cooling of Earth due to ozone layer
• (D) Absorption of UV rays only by atmosphere

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• (A) Movement of water only between oceans and clouds
• (B) Cycling of nutrients between living and non-living components
• (C) Formation of new elements in atmosphere
• (D) Rotation of Earth causing seasons

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• (A) Excess oxygen in atmosphere
• (B) CFCs destroying ozone molecules
• (C) Increase in nitrogen gas
• (D) Dust particles blocking sunlight

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• (A) Increasing fossil fuel usage
• (B) Reducing CFC emissions to protect ozone layer
• (C) Increasing carbon dioxide concentration
• (D) Promoting deforestation

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• (A) They increased oxygen levels
• (B) They failed to significantly reduce CO₂ emissions globally
• (C) They banned solar energy
• (D) They increased ozone depletion

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• (A) Increased rainfall and humidity
• (B) Decreased transpiration and reduced local rainfall
• (C) Increased oxygen production
• (D) Reduced soil fertility improvement

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• (A) Pure oxygen
• (B) Ground-level smog
• (C) Nitrogen gas
• (D) Rain clouds

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• (A) Increasing CO₂ emissions
• (B) Reducing dependence on fossil fuels
• (C) Increasing nitrogen pollution
• (D) Increasing ozone depletion

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• (A) Increase in coral growth
• (B) Ocean acidification affecting marine life
• (C) Freezing of ocean water
• (D) Increase in salinity only

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