NEET UG · Biology · Plant Growth and Development
Plant Growth Regulators: NEET previous year questions
15 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
- 15
- about 1.4 per paper
- Years asked
- 9/10
- last asked 2026
- Weighted estimate
- 1.7
- model; history: 1.4 a paper on average, typically 1–2
Key findings
- 01
Asked in 9 of 10 papers, 15 questions in all: #33 of 204 topics by ten-year total. It comes back every 1.1 years on average.
- 02
86% 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 2,4-D as a Dicot Herbicide, asked 2 times (2024, 2026), usually as “reason for plant hormone application”.
- 04
NEET has asked 13 of the 77 ideas in this topic; 60 have never been asked, directly or indirectly.
- 05
Mostly asked as one-line MCQ (93%); 87% easy, 0% hard, and up from 1.2 to 1.9 questions a paper since 2024.
Questions per year
- Up to 2023
- 1.2
- per paper
- Since 2024
- 1.9
- +0.7
- Usual gap
- 1.1 yrs
- between papers asking it
- Swing
- ±0.6
- questions, year to year
Revise first
2,4-D as a Dicot Herbicide (2024 2026); Gibberellins and Bolting (2026); Gibberellins in Sugarcane Production (2020 2024)
How it is asked
Difficulty, format and skill
Across all 15 questions on Plant Growth Regulators since 2017.
Difficulty
QUESTIONS- Easy13 · 87%
- Medium2 · 13%
- Hard0 · 0%
Format
SHARE- One-line MCQ · 14 Q93%
- Other · 1 Q7%
Skill tested
SHARE- Recall · 13 Q87%
- Concept · 2 Q13%
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 13 of the 77 ideas in this topic. 60 have never been asked yet.
- Asked directly13 · 17%
- Touched inside another question4 · 5%
- Never asked60 · 78%
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.
- Repeated2 · 13%
- 2026 · Q110Which of the following plant growth regulators is used as herbicide?
easyOne-line MCQ
- 2024 · Q130Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
easyOne-line MCQNew idea
- 2026 · Q110
- Repeated2 · 13%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
- 1 · 7%
Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.
Ideas
Every idea inside this topic
13 different ideas were tested; 2 came more than once. Cytokinins and Senescence is the foundation for 4 other ideas in the syllabus.
- 2,4-D as a Dicot Herbicide2×
reason for plant hormone application
One-line MCQ · 11% next - Gibberellins in Sugarcane Production2×
identify growth regulator for agricultural use
One-line MCQ · 6% next - Gibberellins and Bolting1×
identify hormone for an effect
One-line MCQ · 6% next - Auxin-Induced Parthenocarpy1×
count correct statements on plant growth
Other · 6% next - Cytokinins and Senescence1×
identify hormone for an effect
One-line MCQ · 6% next · foundation for 4 - Ethylene in Deep Water Rice1×
identify hormone for an effect
One-line MCQ · 4% next - Gibberellins in Juvenile Conifers1×
identify hormone for an effect
One-line MCQ · 4% next - Ethylene and Cucumber Feminization1×
identify hormone by effect
One-line MCQ · 4% next - Ethylene in Root Growth and Root Hairs1×
identify use of a hormone
One-line MCQ · 4% next - Synthetic Auxins and Weed Control1×
identify hormone for a use
One-line MCQ · 4% next - ABA and GA Antagonism1×
odd-one-out among dormancy regulators
One-line MCQ · 4% next - Auxins in Pineapple Flowering1×
identify hormones for an agricultural use
One-line MCQ · 4% next - Auxin's Dual Role in Abscission1×
identify hormone for an effect
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
Plant Growth Regulators questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested.
NEET 20262 questions
- Q110Which of the following plant growth regulators is used as herbicide?
Idea: 2,4-D as a Dicot Herbicide
EasyOne-line MCQ - Q127Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage?
Idea: Gibberellins and Bolting
New ideaEasyOne-line MCQ
NEET 20252 questions
- Q108Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?
Idea: Cytokinins and Senescence
New ideaEasyOne-line MCQ - Q173Read the following statements on plant growth and development. A. Parthenocarpy can be induced by auxins. B. Plant growth regulators can…
Idea: Auxin-Induced Parthenocarpy
New ideaMediumOther
NEET 20242 questions
- Q130Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
Idea: 2,4-D as a Dicot Herbicide
New ideaEasyOne-line MCQ - Q138Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?
Idea: Gibberellins in Sugarcane Production
EasyOne-line MCQ
NEET 20232 questions
- Q110Which hormone promotes internode/petiole elongation in deep water rice?
Idea: Ethylene in Deep Water Rice
New ideaEasyOne-line MCQ - Q119Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed…
Idea: Gibberellins in Juvenile Conifers
New ideaEasyOne-line MCQ
NEET 20222 questions
- Q115Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this…
Idea: Ethylene and Cucumber Feminization
New ideaEasyOne-line MCQ - Q132The gaseous plant growth regulator is used in plants to :
Idea: Ethylene in Root Growth and Root Hairs
New ideaEasyOne-line MCQ
NEET 20211 question
- Q104The plant hormone used to destroy weeds in a field is :
Idea: Synthetic Auxins and Weed Control
New ideaEasyOne-line MCQ
NEET 20202 questions
- Q64Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of…
Idea: Gibberellins in Sugarcane Production
New ideaEasyOne-line MCQ - Q66Which of the following is not an inhibitory substance governing seed dormancy ?
Idea: ABA and GA Antagonism
New ideaMediumOne-line MCQ
NEET 20191 question
- Q167It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce…
Idea: Auxins in Pineapple Flowering
New ideaEasyOne-line MCQ
NEET 20171 question
- Q158Fruit and leaf drop at early stages can be prevented by the application of :
Idea: Auxin's Dual Role in Abscission
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.