NEET UG · Biology · Environmental Issues
Greenhouse Effect: NEET previous year questions
This topic’s chapter, Environmental Issues, is not in the NEET UG 2026 syllabus. It had 3 questions from 2017 to 2019; they are kept here for reference.
- Asked in 10 years
- 3
- about 0.3 per paper
- Years asked
- 2/10
- last asked 2019
- Syllabus
- Dropped
- not in NEET UG 2026
- Last asked
- 2019
- 7 papers ago
Key findings
- 01
Asked in 2 of 10 papers, 3 questions in all: #181 of 204 topics by ten-year total. Last asked in 2019.
- 02
100% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
- 03
No idea in this topic has been asked twice: every question tested something new.
- 04
NEET has asked 3 of the 88 ideas in this topic; 84 have never been asked, directly or indirectly.
- 05
Mostly asked as one-line MCQ (100%); 100% easy, 0% hard, and down from 0.4 to 0.0 questions a paper since 2024.
Questions per year
- Up to 2023
- 0.4
- per paper
- Since 2024
- 0.0
- -0.4
- Usual gap
- 1.0 yrs
- between papers asking it
- Swing
- ±0.6
- questions, year to year
How it is asked
Difficulty, format and skill
Across all 3 questions on Greenhouse Effect since 2017.
Difficulty
QUESTIONS- Easy3 · 100%
- Medium0 · 0%
- Hard0 · 0%
Format
SHARE- One-line MCQ · 3 Q100%
Skill tested
SHARE- Recall · 3 Q100%
Repeats
New idea, or one asked before?
Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.
- Idea asked for the first time
- Idea asked in an earlier paper
Coverage of the topic
NEET has asked 3 of the 88 ideas in this topic. 84 have never been asked yet.
- Asked directly3 · 3%
- Touched inside another question1 · 1%
- Never asked84 · 95%
Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.
Drill down
Idea, year, question
Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.
- 1 · 33%
- 2019 · Q139Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere ?
easyOne-line MCQNew idea
- 2019 · Q139
- 1 · 33%
- 1 · 33%
Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.
Ideas
Every idea inside this topic
3 different ideas were tested; none came more than once. Relative GHG Contribution is the foundation for 11 other ideas in the syllabus.
- Montreal and Kyoto Protocols1×
identify protocol for an environmental aim
One-line MCQ · 4% next · foundation for 5 - Relative GHG Contribution1×
identify gases for an environmental effect
One-line MCQ · 4% next · foundation for 11 - Tropospheric Ozone and Smog1×
identify example of a pollutant type
One-line MCQ · 4% next
Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas
Every question
Greenhouse Effect questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested.
NEET 20192 questions
- Q102Which of the following pairs of gases is mainly responsible for green house effect ?
Idea: Relative GHG Contribution
New ideaEasyOne-line MCQ - Q139Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere ?
Idea: Montreal and Kyoto Protocols
New ideaEasyOne-line MCQ
NEET 20181 question
- Q113Which of the following is a secondary pollutant ?
Idea: Tropospheric Ozone and Smog
New ideaEasyOne-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.