Pollution Quiz - CBSE Class 12 Biology
Free practice quiz: Pollution (CBSE Class 12 Biology). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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What is the primary cause of air pollution?
- Natural disasters
- Industrial emissions
- Plant respiration
- Ocean waves
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Answer: B. Industrial emissions
Industrial emissions refer to the contaminants released into the air by factories and manufacturing plants, which are the primary contributors to air pollution.
Which gas is primarily responsible for acid rain?
- Ozone
- Carbon dioxide
- Sulfur dioxide
- Methane
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Answer: C. Sulfur dioxide
Sulfur dioxide reacts with water in the atmosphere to form sulfuric acid, leading to acid rain, which can harm ecosystems and buildings.
Which of the following causes eutrophication in water bodies?
- Increased sediment
- Nutrient runoff
- Heavy metal deposits
- Excessive thermal pollution
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Answer: B. Nutrient runoff
Nutrient runoff, particularly nitrogen and phosphorus from fertilizers, can cause eutrophication, leading to algal blooms and oxygen depletion in water bodies.
Which human activity is a significant contributor to soil pollution?
- Reforestation
- Overgrazing
- Organic farming
- Crop rotation
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Answer: B. Overgrazing
Overgrazing leads to soil degradation and pollution by compacting the soil, reducing its ability to absorb water, and leading to contamination from waste.
What is the significance of biodegradability?
- Incomplete decomposition
- Chemical stability
- Ability to decompose naturally
- Increased toxicity
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Answer: C. Ability to decompose naturally
Biodegradability refers to the ability of substances to break down naturally by microorganisms, reducing the impact of waste on the environment.