NEET UG · Biology · Ecosystem
Ecosystem Structure, Decomposition and Nutrient Cycling: NEET previous year questions
4 questions in ten years of NEET, in 2 of 10 papers. Pattern: Now and then. Here is how it is asked and which ideas come back.
- Asked in 10 years
- 4
- about 0.4 per paper
- Years asked
- 2/10
- last asked 2022
- Weighted estimate
- 0.2
- model; history: 0.4 a paper on average, typically 0–2
Key findings
- 01
Asked in 2 of 10 papers, 4 questions in all: #173 of 204 topics by ten-year total. It comes back every 5.0 years on average. Last asked in 2022.
- 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 0 of the 7 ideas in this topic; 0 have never been asked, directly or indirectly.
- 05
Mostly asked as one-line MCQ (75%); 50% easy, 0% hard, and down from 0.6 to 0.0 questions a paper since 2024.
Questions per year
- Up to 2023
- 0.6
- per paper
- Since 2024
- 0.0
- -0.6
- Usual gap
- 5.0 yrs
- between papers asking it
- Swing
- ±0.8
- questions, year to year
How it is asked
Difficulty, format and skill
Across all 4 questions on Ecosystem Structure, Decomposition and Nutrient Cycling since 2017.
Difficulty
QUESTIONS- Easy2 · 50%
- Medium2 · 50%
- Hard0 · 0%
Format
SHARE- One-line MCQ · 3 Q75%
- Two statements · 1 Q25%
Skill tested
SHARE- Recall · 3 Q75%
- Concept · 1 Q25%
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 0 of the 7 ideas in this topic. 0 have never been asked yet.
- Asked directly0 · 0%
- Touched inside another question7 · 100%
- Never asked0 · 0%
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 · 25%
- 2022 · Q120Given below are two statements : Statement I : Decomposition is a process in which the detritus is degraded into simpler substances by…
mediumTwo statementsNew idea
- 2022 · Q120
- 1 · 25%
- 1 · 25%
- 1 · 25%
Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.
Ideas
Every idea inside this topic
4 different ideas were tested; none came more than once.
- Factors Affecting Decomposition1×
statement i/ii on decomposition
Two statements · 4% next - Phosphorus Cycle1×
identify factor in nutrient cycle
One-line MCQ · 4% next - Productivity and Biomass of Ecosystems1×
identify ecosystem with a property
One-line MCQ · 4% next - Vertical Stratification1×
identify biome with a property
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
Ecosystem Structure, Decomposition and Nutrient Cycling questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested.
NEET 20222 questions
- Q120Given below are two statements : Statement I : Decomposition is a process in which the detritus is degraded into simpler substances by…
Idea: Factors Affecting Decomposition
New ideaMediumTwo statements - Q143Which one of the following will accelerate phosphorus cycle ?
Idea: Phosphorus Cycle
New ideaMediumOne-line MCQ
NEET 20172 questions
- Q127Which ecosystem has the maximum biomass ?
Idea: Productivity and Biomass of Ecosystems
EasyOne-line MCQ - Q133Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :
Idea: Vertical Stratification
EasyOne-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.