🌍 Environment & Ecology MCQ Questions
Set – 6 | Competitive Examinations
Take your environment knowledge to the next level! Perfect for global competitive exams 🌱🌎
Q51. Which of the following is a greenhouse gas?
- (A) Carbon dioxide
- (B) Oxygen
- (C) Nitrogen
- (D) Helium
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Correct answer is Carbon dioxide. CO₂ traps heat in the atmosphere, contributing to global warming.
Q52. The primary source of energy for the water cycle is:
- (A) Solar radiation
- (B) Geothermal heat
- (C) Wind energy
- (D) Tidal forces
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Correct answer is Solar radiation. Sun’s energy drives evaporation and precipitation in the water cycle.
Q53. Which of the following is a non-renewable resource?
- (A) Coal
- (B) Wind energy
- (C) Solar energy
- (D) Tidal energy
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Correct answer is Coal. Coal is finite and cannot be replenished on a human timescale.
Q54. Which of the following contributes most to ocean acidification?
- (A) Carbon dioxide
- (B) Nitrogen gas
- (C) Oxygen
- (D) Hydrogen)
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Correct answer is Carbon dioxide. CO₂ dissolves in seawater forming carbonic acid, lowering pH.
Q55. Which of the following is a biotic component of an ecosystem?
- (A) Animals
- (B) Water
- (C) Soil)
- (D) Sunlight
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Correct answer is Animals. Biotic components are living organisms in an ecosystem.
Q56. Which biome has the highest biodiversity?
- (A) Tropical rainforest
- (B) Desert)
- (C) Tundra
- (D) Taiga
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Correct answer is Tropical rainforest. Warm, wet, and stable conditions support diverse species.
Q57. Which of these is the main cause of coral bleaching?
- (A) Rising sea temperatures
- (B) Increased salinity)
- (C) Ocean currents
- (D) Algal growth
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Correct answer is Rising sea temperatures. Thermal stress causes corals to expel their symbiotic algae.
Q58. Which human activity primarily increases greenhouse gases?
- (A) Fossil fuel combustion
- (B) Afforestation)
- (C) Solar panel use
- (D) Recycling)
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Correct answer is Fossil fuel combustion. Burning coal, oil, and gas emits CO₂, enhancing the greenhouse effect.
Q59. Which of these is NOT a consequence of deforestation?
- (A) Increased oxygen levels
- (B) Soil erosion
- (C) Loss of biodiversity
- (D) Climate change)
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Correct answer is Increased oxygen levels. Deforestation reduces oxygen production, it does not increase it.
Q60. Which environmental change is directly linked to global warming?
- (A) Rising sea levels
- (B) Increased earthquakes
- (C) Decreased wind speeds
- (D) Solar eclipses)
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Correct answer is Rising sea levels. Melting glaciers and thermal expansion of oceans cause sea level rise.
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