Environmental pollution has mainly resulted from, a) natural balance, c) animal behaviour, d) seasonal changes, b) modern lifestyles, Greenhouse gases are important because they, a) block sunlight completely, b) cool the Earth, c) trap heat in the atmosphere, d) destroy oxygen, Which of the following is NOT a greenhouse gas?, a) Carbon dioxide, b) Methane, c) Nitrogen, d) Nitrous oxide, The greenhouse effect keeps Earth’s temperature at about, 0°C, b) 10°C, c) 15.5°C, c) 1.55°C, Global warming occurs mainly due to, a) increased rainfall, b) excessive greenhouse gases, c) soil erosion, d) water shortage, Which human activity contributes most to air pollution?, a) Recycling, b) Fuel burning, c) Tree planting, d) Rainfall, Acid rain is formed when, a) sunlight mixes with air, b) smoke mixes with water vapour, c) soil mixes with water, d) ozone mixes with oxygen, The ozone layer protects Earth from, a) heavy rain, b) air pollution, c) ultraviolet rays, d) greenhouse gases, Ozone depletion is mainly caused by, a) CO₂, b) water vapour, c) CFCs, d) nitrogen, Which disease is caused by polluted air?, a) Cholera, b) Dysentery, c) Asthma, d) Typhoid, Polluted water can destroy, a) mountains, b) deserts, c) aquatic ecosystems, d) air quality, excessive use of fertilisers leads to, a) soil improvement, b) soil degradation, c) soil protection, d) soil cooling, Chemical wastes from factories often, a) purify soil, b) increase forest growth, c) leak into soil layers, d) evaporate immediately, Noise pollution is mainly caused by, a) rivers, b) forests, c) urbanisation, d) oceans, Light pollution is caused by, a) moonlight, b) sunlight, c) artificial outdoor lighting, d) fire.

Grade 12

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