🌍 Environment & Ecology MCQ Questions
Set – 8 | Competitive Examinations
Strengthen your environmental knowledge! Ideal for international competitive exams 🌱🌎
Q71. Which gas is mainly responsible for acid rain?
- (A) Sulfur dioxide
- (B) Oxygen
- (C) Nitrogen)
- (D) Hydrogen)
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Correct answer is Sulfur dioxide. It reacts with water vapor in the atmosphere forming sulfuric acid.
Q72. Which of the following is an example of a biome with high biodiversity?
- (A) Tropical rainforest
- (B) Tundra
- (C) Desert
- (D) Taiga
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Correct answer is Tropical rainforest. These forests support the greatest variety of plant and animal species.
Q73. Which human activity is the largest contributor to ocean acidification?
- (A) Burning fossil fuels
- (B) Wind farming
- (C) Solar energy production
- (D) Reforestation)
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Correct answer is Burning fossil fuels. CO₂ emissions dissolve in oceans forming carbonic acid, lowering pH.
Q74. Which of the following is considered a non-renewable resource?
- (A) Coal
- (B) Solar energy)
- (C) Wind energy)
- (D) Biomass)
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Correct answer is Coal. Coal is finite and cannot be regenerated within a human time scale.
Q75. Which of the following is a keystone species in marine ecosystems?
- (A) Sea otter
- (B) Clownfish)
- (C) Parrotfish)
- (D) Jellyfish)
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Correct answer is Sea otter. Sea otters maintain kelp forest ecosystems by preying on sea urchins.
Q76. Which of the following is a major consequence of deforestation worldwide?
- (A) Loss of biodiversity
- (B) Increased oxygen)
- (C) Lower CO₂ levels)
- (D) Cooler temperatures)
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Correct answer is Loss of biodiversity. Clearing forests destroys habitats and threatens species survival.
Q77. Which process cycles water from the surface to the atmosphere and back?
- (A) Hydrological cycle
- (B) Carbon cycle)
- (C) Nitrogen cycle)
- (D) Oxygen cycle)
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Correct answer is Hydrological cycle. This cycle includes evaporation, condensation, and precipitation.
Q78. Which of the following is an effect of ozone layer depletion?
- (A) Increased UV radiation on Earth
- (B) Less solar energy)
- (C) Global cooling)
- (D) Increased rainfall)
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Correct answer is Increased UV radiation on Earth. Thinning ozone allows more UV rays to reach the surface.
Q79. Which of the following energy sources is considered sustainable and eco-friendly?
- (A) Wind energy
- (B) Coal)
- (C) Oil)
- (D) Natural gas)
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Correct answer is Wind energy. Wind turbines produce electricity without emitting greenhouse gases.
Q80. Which of the following contributes most to marine dead zones?
- (A) Excess nutrient runoff
- (B) Wind energy)
- (C) Solar panels)
- (D) Rainfall)
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Correct answer is Excess nutrient runoff. Fertilizers from land enter oceans, causing oxygen depletion.
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