NEET UG · Biology · Biodiversity and Conservation

Biodiversity Loss: NEET previous year questions

5 questions in ten years of NEET, in 5 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 5; about 0.5 per paper
Years asked: 5/10; last asked 2025
Chance of a question next paper: 50%; historical rate, how we compute it
Weighted estimate: 0.5; model; history: 0.5 a paper on average, typically 0–1

Key findings

01
Asked in 5 of 10 papers, 5 questions in all: #148 of 204 topics by ten-year total. It comes back every 1.5 years on average. Last asked in 2025.
02
60% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
03
The most repeated idea is Components of the Evil Quartet, asked 2 times (2022, 2024), usually as “identify outcome of listed causes”.
04
NEET has asked 3 of the 86 ideas in this topic; 78 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (60%); 100% easy, 0% hard.

Questions per year

Up to 2023: 0.4; per paper
Since 2024: 0.6; 0.2
Usual gap: 1.5 yrs; between papers asking it
Swing: ±0.5; questions, year to year

How it is asked

Difficulty, format and skill

Across all 5 questions on Biodiversity Loss since 2017.

Difficulty

QUESTIONS

Easy5 · 100%
Medium0 · 0%
Hard0 · 0%

Format

One-line MCQ · 3 Q60%
Match the lists · 1 Q20%
Other · 1 Q20%

Skill tested

Recall · 5 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.

’17’18’19’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier paper

Coverage of the topic

NEET has asked 3 of the 86 ideas in this topic. 78 have never been asked yet.

Asked directly3 · 3%
Touched inside another question5 · 6%
Never asked78 · 91%

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.

ideaAskedShareYears’17’18’19’20’21’22’23’24’25’26

Repeated2 · 40%40%2/10
- 2024 · Q134
  These are regarded as major causes of biodiversity loss: A. Over exploitation B. Co-extinction C. Mutation D. Habitat loss and…
  easyOther
- 2022 · Q119
  Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for :
  easyOne-line MCQNew idea
Repeated2 · 40%40%2/10
1 · 20%20%1/10

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; 2 came more than once. Habitat Loss and Fragmentation is the foundation for 13 other ideas in the syllabus.

Components of the Evil Quartet2×
identify outcome of listed causes
Other · 6% next
Habitat Loss and Fragmentation2×
identify most important cause of extinction
One-line MCQ · 6% next · foundation for 13
The Evil Quartet Concept1×
match list on biodiversity loss and conservation
Match the lists · 6% next

Idea	Times	Format	Chance next	Foundation for
Components of the Evil Quartetidentify outcome of listed causes	2	OtherRecall	6%	–
Habitat Loss and Fragmentationidentify most important cause of extinction	2	One-line MCQRecall	6%	13 ideas
The Evil Quartet Conceptmatch list on biodiversity loss and conservation	1	Match the listsRecall	6%	–

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

Biodiversity Loss questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested.

NEET 20251 question

Q164
Match List I with List II: List I | List II A. The Evil Quartet | I. Cryopreservation B. Ex situ conservation | II. Alien species invasion…
Idea: The Evil Quartet Concept
New ideaEasyMatch the lists

NEET 20241 question

Q134
These are regarded as major causes of biodiversity loss: A. Over exploitation B. Co-extinction C. Mutation D. Habitat loss and…
Idea: Components of the Evil Quartet
EasyOther

NEET 20231 question

Q108
Among 'The Evil Quartet', which one is considered the most important cause driving extinction of species?
Idea: Habitat Loss and Fragmentation
EasyOne-line MCQ

NEET 20221 question

Q119
Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for :
Idea: Components of the Evil Quartet
New ideaEasyOne-line MCQ

NEET 20191 question

Q98
Which of the following is the most important cause for animals and plants being driven to extinction ?
Idea: Habitat Loss and Fragmentation
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.