NEET UG · Biology · Class 12
Environmental Issues: NEET previous year questions
This chapter is not in the NEET UG 2026 syllabus. It had 19 questions from 2017 to 2023; they are kept here for reference.
- Asked in 10 years
- 19
- 7 of 10 papers
- 10-year average
- 1.8
- a paper · 0.0 since 2024 -2.6
- Typical range
- 0–4
- questions a paper; fewest 0, most 4
- Syllabus
- Dropped
- NEET UG 2026 syllabus
- Typical range (fact)
- 10-year average (fact)
- Weighted estimate (model)
Typical range: questions per paper in the middle eight of the ten papers, leaving out the single highest and lowest year (about the 10th to 90th percentile), each paper scaled to 180 questions. The ten-year average and the range are historical fact. The weighted estimate is a model: each paper's share, with recent papers counting more (half-life three years), and dropped syllabus removed. It is a guide to effort, not a forecast.
Questions per year
Kind of question
SHARE OF 10 YEARS- Recall68%
- Concept16%
- Two statements11%
- Match the lists5%
Most common asks: definition recall (2); true statement selection on water pollution (2); date recall of an environmental day (1).
Profile
This chapter in numbers
Where it ranks, how steady it is, and what it costs to study.
- Syllabus
- Dropped
- not in NEET UG 2026
- Last asked
- 2023
- Share of the paper
- 1.0%
- ten-year average
- Busiest year
- 2018
- 4 questions
- Year to year
- Some swing
- varies by about 1.6 questions
- Long-run direction
- -0.31
- questions per paper, per year
- Easy questions
- 74%
- 12% of ideas rated hard
- With a figure
- 0%
- graph, diagram or structure
- Botany / Zoology
- 15 / 4
- questions by section
- Foundation for others
- 17%
- of its ideas are used in other chapters
Difficulty, year by year
Each question rated easy, medium or hard against NCERT.
- 20171
- 20184
- 20194
- 20202
- 20211
- 20223
- 20234
- 2024
- 2025
- 2026
- Easy
- Medium
- Hard
What it asks you to do
SHARE OF QUESTIONS- Recall84%
- Concept16%
Coverage
How much of the chapter NEET has used
We split the chapter into 267 ideas. In ten years NEET built a question around 10 of them. Most of the chapter has never been asked, which is why learning it whole beats memorising past questions.
- Asked as the main idea
- 10
- Touched on in a question
- 9
- Never asked
- 248
Topics
What repeats, topic by topic
Questions per topic in each year's paper. Topics that come every year are worth learning first.
- Air Pollution Control and Waste Management · Every year811231
- Ozone Depletion · Due again51211
- Water Pollution · Now and then312
- Greenhouse Effect · Gone quiet312
| Topic | 2017 | ’18 | 2019 | ’20 | 2021 | ’22 | 2023 | ’24 | 2025 | ’26 | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Air Pollution Control and Waste ManagementEvery year | 1 | 1 | 2 | · | · | 3 | 1 | · | · | · | 8 |
| Ozone DepletionDue again | · | 1 | · | 2 | 1 | · | 1 | · | · | · | 5 |
| Water PollutionNow and then | · | 1 | · | · | · | · | 2 | · | · | · | 3 |
| Greenhouse EffectGone quiet | · | 1 | 2 | · | · | · | · | · | · | · | 3 |
Drill down
Topic, idea, question
Open a topic to see every idea NEET tested inside it, then open an idea to read the questions. Each row shows its ten papers.
Ideas
The exact ideas NEET has asked
Inside the topics, 16 different ideas were tested. These came more than once, or are new since 2024.
- Electrostatic Precipitator and Scrubber3×
statement i/ii on pollution control
- Dobson Units2×
definition recall
Every question
Environmental Issues questions, year by year
The opening words of each question as it appeared in the official paper.
NEET 20234 questions
- Q105The thickness of ozone in a column of air in the atmosphere is measured in terms of :One-line MCQ
- Q142Which one of the following statements is NOT correct?One-line MCQ
- Q177Given below are two statements: Statement I: Electrostatic precipitator is most widely used in thermal power plant. Statement II:…Two statements
- Q183Which of the following statements is correct?One-line MCQ
NEET 20223 questions
- Q107The device which can remove particulate matter present in the exhaust from a thermal power plant is :One-line MCQ
- Q136The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false ?One-line MCQ
- Q190Given below are two statements : Statement I : In a scrubber the exhaust from the thermal plant is passed through the electric wires to…Two statements
NEET 20211 question
- Q177Dobson units are used to measure thickness of :One-line MCQ
NEET 20202 questions
- Q56Montreal protocol was signed in 1987 for control of :One-line MCQ
- Q90Snow-blindness in Antarctic region is due to :One-line MCQ
NEET 20194 questions
- Q102Which of the following pairs of gases is mainly responsible for green house effect ?One-line MCQ
- Q139Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere ?One-line MCQ
- Q177Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for :One-line MCQ
- Q178Which of these following methods is the most suitable for disposal of nuclear waste ?One-line MCQ
NEET 20184 questions
- Q112World Ozone Day is celebrated onOne-line MCQ
- Q113Which of the following is a secondary pollutant ?One-line MCQ
- Q116In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ?One-line MCQ
- Q155Match the items given in Column I with those in Column II and select the correct option given below : Column I | Column II a.…Match the lists
NEET 20171 question
- Q153Which one of the following statements is not valid for aerosols ?One-line MCQ
Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.