NEET UG · Biology · Excretory Products and their Elimination

Urine Formation: NEET previous year questions

13 questions in ten years of NEET, in 9 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 13; about 1.2 per paper
Years asked: 9/10; last asked 2026
Chance of a question next paper: 84%; historical rate, how we compute it
Weighted estimate: 1.3; model; history: 1.2 a paper on average, typically 1–2

Key findings

01
Asked in 9 of 10 papers, 13 questions in all: #49 of 204 topics by ten-year total. It comes back every 1.1 years on average.
02
82% of its questions since 2018 tested an idea never asked before; 1 repeated an idea from the year before.
03
The most repeated idea is Descending Limb Permeability, asked 2 times (2024, 2026), usually as “statement i/ii on nephron”.
04
NEET has asked 9 of the 81 ideas in this topic; 61 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (46%); 31% easy, 8% hard.

Questions per year

Up to 2023: 1.2; per paper
Since 2024: 1.3; 0.0
Usual gap: 1.1 yrs; between papers asking it
Swing: ±0.7; questions, year to year

Revise first

Descending Limb Permeability (2024 2026); Cortical vs Juxtamedullary Nephrons (2023 2024); pH Maintenance by the PCT (2025)

How it is asked

Difficulty, format and skill

Across all 13 questions on Urine Formation since 2017.

Difficulty

QUESTIONS

Easy4 · 31%
Medium8 · 62%
Hard1 · 8%

Format

One-line MCQ · 6 Q46%
Other · 2 Q15%
Match the lists · 2 Q15%
Figure-based · 1 Q8%
Two statements · 1 Q8%
Assertion–reason · 1 Q8%

Skill tested

Concept · 8 Q62%
Recall · 4 Q31%
Figure reading · 1 Q8%

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 9 of the 81 ideas in this topic. 61 have never been asked yet.

91161

Asked directly9 · 11%
Touched inside another question11 · 14%
Never asked61 · 75%

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 · 15%15%2/10
- 2024 · Q193
  Choose the correct statement given below regarding juxta medullary nephron.
  mediumOne-line MCQAsked the year before
- 2023 · Q178
  Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Nephrons are of two types:…
  easyAssertion–reasonNew idea
Repeated2 · 15%15%2/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%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

11 different ideas were tested; 2 came more than once. Loop of Henle Role is the foundation for 11 other ideas in the syllabus.

Descending Limb Permeability2×
statement i/ii on nephron
Other · 11% next · foundation for 1
Cortical vs Juxtamedullary Nephrons2×
assertion-reason on nephron types
Assertion–reason · 6% next
pH Maintenance by the PCT1×
identify correct diagram of tubule transport
Figure-based · 6% next
ADH/Vasopressin Mechanism1×
count correct statements on adh and anf
Other · 4% next · foundation for 6
Excretory Structures of Invertebrates1×
match list on excretory structures of animals
Match the lists · 4% next
Ammonotelism, Ureotelism and Uricotelism1×
identify animal by type of nitrogenous waste
One-line MCQ · 4% next
Aldosterone Target Sites1×
identify hormonal mechanism preventing diuresis
One-line MCQ · 4% next
Loop of Henle Role1×
factor responsible for concentrated urine
One-line MCQ · 4% next · foundation for 11
Malpighian Body Components1×
match list on excretory functions
Match the lists · 4% next
ANF Opposition to RAAS1×
odd-one-out among hormones
One-line MCQ · 4% next
Ascending Limb Permeability1×
true statement selection on nephron
One-line MCQ · 4% next · foundation for 2

Idea	Times	Format	Chance next	Foundation for
Descending Limb Permeabilitystatement i/ii on nephron	2	OtherConcept	11%	1 ideas
Cortical vs Juxtamedullary Nephronsassertion-reason on nephron types	2	Assertion–reasonConcept	6%	–
pH Maintenance by the PCTidentify correct diagram of tubule transport	1	Figure-basedFigure reading	6%	–
ADH/Vasopressin Mechanismcount correct statements on adh and anf	1	OtherConcept	4%	6 ideas
Excretory Structures of Invertebratesmatch list on excretory structures of animals	1	Match the listsRecall	4%	–
Ammonotelism, Ureotelism and Uricotelismidentify animal by type of nitrogenous waste	1	One-line MCQRecall	4%	–
Aldosterone Target Sitesidentify hormonal mechanism preventing diuresis	1	One-line MCQConcept	4%	–
Loop of Henle Rolefactor responsible for concentrated urine	1	One-line MCQConcept	4%	11 ideas
Malpighian Body Componentsmatch list on excretory functions	1	Match the listsRecall	4%	–
ANF Opposition to RAASodd-one-out among hormones	1	One-line MCQConcept	4%	–
Ascending Limb Permeabilitytrue statement selection on nephron	1	One-line MCQRecall	4%	2 ideas

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

Urine Formation questions, year by year

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

NEET 20261 question

Q157
Which of the following statements about the reabsorption process in Henle's loop are correct ? (a) The descending limb of Henle's loop is…
Idea: Descending Limb Permeability
MediumOther

NEET 20251 question

Q125
Which of the following diagrams is correct with regard to the proximal (P) and distal (D) tubule of the Nephron.
Idea: pH Maintenance by the PCT
New ideaHardFigure-based · figure

NEET 20242 questions

Q161
Given below are two statements: Statement I: In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to…
Idea: Descending Limb Permeability
New ideaMediumTwo statements
Q193
Choose the correct statement given below regarding juxta medullary nephron.
Idea: Cortical vs Juxtamedullary Nephrons
Asked last yearMediumOne-line MCQ

NEET 20233 questions

Q161
Match List I with List II. List I | List II A. Taenia | I. Nephridia B. Paramoecium | II. Contractile vacuole C. Periplaneta | III. Flame…
Idea: Excretory Structures of Invertebrates
New ideaMediumMatch the lists
Q178
Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Nephrons are of two types:…
Idea: Cortical vs Juxtamedullary Nephrons
New ideaEasyAssertion–reason
Q188
Which of the following statements are correct? A. An excessive loss of body fluid from the body switches off osmoreceptors. B. ADH…
Idea: ADH/Vasopressin Mechanism
New ideaMediumOther

NEET 20221 question

Q159
Nitrogenous waste is excreted in the form of pellet or paste by :
Idea: Ammonotelism, Ureotelism and Uricotelism
New ideaEasyOne-line MCQ

NEET 20201 question

Q68
Which of the following would help in prevention of diuresis ?
Idea: Aldosterone Target Sites
New ideaMediumOne-line MCQ

NEET 20191 question

Q132
Which of the following factors is responsible for the formation of concentrated urine ?
Idea: Loop of Henle Role
New ideaMediumOne-line MCQ

NEET 20181 question

Q164
Match the items given in Column I with those in Column II and select the correct option given below : Column I (Function) | Column II…
Idea: Malpighian Body Components
New ideaEasyMatch the lists

NEET 20172 questions

Q154
A decrease in blood pressure/volume will not cause the release of :
Idea: ANF Opposition to RAAS
MediumOne-line MCQ
Q157
Which of the following statements is correct ?
Idea: Ascending Limb Permeability
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.