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.

This CBSE Class 12 Biology practice quiz has 18 multiple-choice questions on Pollution, and 18 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the primary cause of air pollution?

   1. Natural disasters
   2. Industrial emissions
   3. Plant respiration
   4. Ocean waves
   Show answer

   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.

2. Which gas is primarily responsible for acid rain?

   1. Ozone
   2. Carbon dioxide
   3. Sulfur dioxide
   4. Methane
   Show answer

   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.

3. Which of the following causes eutrophication in water bodies?

   1. Increased sediment
   2. Nutrient runoff
   3. Heavy metal deposits
   4. Excessive thermal pollution
   Show answer

   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.

4. Which human activity is a significant contributor to soil pollution?

   1. Reforestation
   2. Overgrazing
   3. Organic farming
   4. Crop rotation
   Show answer

   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.

5. What is the significance of biodegradability?

   1. Incomplete decomposition
   2. Chemical stability
   3. Ability to decompose naturally
   4. Increased toxicity
   Show answer

   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.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following is a non-point source of pollution?
2. What is the greenhouse effect?
3. What type of pollution is caused by excessive noise?
4. Which of the following is a consequence of deforestation?
5. What pollutant is associated with indoor air quality issues?
6. What is the main source of plastic pollution in oceans?
7. How does urbanization contribute to environmental pollution?
8. What is the effect of heavy metals in the environment?
9. Which of the following is a result of climate change?
10. What role do wetlands play in pollution control?
11. What is the primary effect of global warming on polar habitats?
12. What are microplastics, and why are they concerning?
13. Which environmental issue is linked to excessive nitrogen use in agriculture?

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