NEET UG · Biology · Environmental Issues
Water Pollution: 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 2023; they are kept here for reference.
- Asked in 10 years
- 3
- about 0.3 per paper
- Years asked
- 2/10
- last asked 2023
- Syllabus
- Dropped
- not in NEET UG 2026
- Last asked
- 2023
- 3 papers ago
Key findings
- 01
Asked in 2 of 10 papers, 3 questions in all: #180 of 204 topics by ten-year total. It comes back every 5.0 years on average. Last asked in 2023.
- 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 89 ideas in this topic; 80 have never been asked, directly or indirectly.
- 05
Mostly asked as one-line MCQ (67%); 67% 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
- 5.0 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 Water Pollution since 2017.
Difficulty
QUESTIONS- Easy2 · 67%
- Medium1 · 33%
- Hard0 · 0%
Format
SHARE- One-line MCQ · 2 Q67%
- Match the lists · 1 Q33%
Skill tested
SHARE- Concept · 2 Q67%
- Recall · 1 Q33%
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 89 ideas in this topic. 80 have never been asked yet.
- Asked directly3 · 3%
- Touched inside another question6 · 7%
- Never asked80 · 90%
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%
- 2023 · Q183Which of the following statements is correct?
easyOne-line MCQNew idea
- 2023 · Q183
- 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. Eutrophication Process is the foundation for 22 other ideas in the syllabus.
- Biological Magnification1×
true statement selection on water pollution
One-line MCQ · 4% next · foundation for 9 - Planktonic Algae in Blooms1×
true statement selection on water pollution
One-line MCQ · 4% next · foundation for 1 - Eutrophication Process1×
match list on environmental issues
Match the lists · 4% next · foundation for 22
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
Water Pollution questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested.
NEET 20232 questions
- Q142Which one of the following statements is NOT correct?
Idea: Planktonic Algae in Blooms
New ideaMediumOne-line MCQ - Q183Which of the following statements is correct?
Idea: Biological Magnification
New ideaEasyOne-line MCQ
NEET 20181 question
- Q155Match the items given in Column I with those in Column II and select the correct option given below : Column I | Column II a.…
Idea: Eutrophication Process
New ideaEasyMatch the lists
Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.