Environmental Issues Practice Questions
Class 12 · Biology · 3083 free MCQs with instant results and detailed explanations.
3083
Total
953
Easy
1506
Medium
624
Hard
Start Practicing Environmental Issues
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Topics in Environmental Issues
Deforestation
607
Air Pollution
632
Ozone Depletion
583
Solid Waste
629
Water Pollution
632
Sample Questions from Environmental Issues
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following is a primary pollutant in the air?
A.
Carbon monoxide
B.
Ozone
C.
Nitrogen dioxide
D.
Sulfuric acid
Show Answer & Explanation
Correct Answer: A
Carbon monoxide is a primary pollutant as it is directly emitted from sources like vehicle exhaust.
Q2
Easy
Which gas is primarily responsible for the formation of acid rain?
A.
Carbon dioxide
B.
Nitrogen dioxide
C.
Sulfur dioxide
D.
Methane
Show Answer & Explanation
Correct Answer: C
Sulfur dioxide reacts with water vapor to form sulfuric acid, leading to acid rain.
Q3
Easy
What is the main source of particulate matter in urban areas?
A.
Vegetation
B.
Construction activities
C.
Natural disasters
D.
Ocean waves
Show Answer & Explanation
Correct Answer: B
Construction activities release a significant amount of dust and particles into the air.
Q4
Medium
Which of the following pollutants is primarily responsible for the formation of acid rain?
A.
Carbon monoxide
B.
Sulfur dioxide
C.
Nitrogen dioxide
D.
Ozone
Show Answer & Explanation
Correct Answer: B
Sulfur dioxide reacts with water in the atmosphere to form sulfuric acid, leading to acid rain.
Q5
Medium
What is the major health effect associated with long-term exposure to particulate matter (PM2.5)?
A.
Skin allergies
B.
Respiratory diseases
C.
Eye irritation
D.
Digestive problems
Show Answer & Explanation
Correct Answer: B
Particulate matter can penetrate deep into the lungs, causing chronic respiratory issues and other health problems.
Q6
Medium
Which of the following is a secondary pollutant found in urban air?
A.
Carbon monoxide
B.
Nitrogen oxides
C.
Ozone
D.
Sulfur dioxide
Show Answer & Explanation
Correct Answer: C
Ozone is formed in the atmosphere through photochemical reactions involving sunlight and other pollutants.
Q7
Medium
Which of the following strategies is most effective for reducing vehicle emissions?
A.
Increasing fuel taxes
B.
Promoting public transportation
C.
Implementing speed limits
D.
Encouraging carpooling
Show Answer & Explanation
Correct Answer: B
Promoting public transportation reduces the number of vehicles on the road, thus significantly lowering emissions.
Q8
Hard
What is the main health risk associated with long-term exposure to particulate matter (PM10)?
A.
Skin irritation
B.
Lung cancer
C.
Hearing loss
D.
Vision impairment
Show Answer & Explanation
Correct Answer: B
Long-term exposure to PM10 can lead to serious respiratory issues and is linked to lung cancer due to its ability to penetrate deep into the lungs and bloodstream.
Q9
Hard
Which of the following is NOT a source of indoor air pollution?
A.
Construction materials
B.
Household cleaning agents
C.
Industrial emissions
D.
Gas stoves
Show Answer & Explanation
Correct Answer: C
Industrial emissions are typically an outdoor air pollution source, while the other options are common contributors to indoor air pollution.
Q10
Hard
Which pollutant is primarily responsible for acid rain?
A.
Carbon dioxide
B.
Sulfur dioxide
C.
Methane
D.
Lead
Show Answer & Explanation
Correct Answer: B
Sulfur dioxide reacts with water in the atmosphere to form sulfuric acid, which is a major component of acid rain.
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Environmental Issues — Class 12 Biology Practice Questions Online
This page contains 3083 practice MCQs for the chapter Environmental Issues in Class 12 Biology. The questions are organized by difficulty — 953 easy, 1506 medium, 624 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.