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Plant Physiology Important Questions for NEET Biology - 2026

Q: 1. What types of important questions are usually asked from Photosynthesis in NEET Biology?

Photosynthesis questions in NEET focus on mechanisms, pathways, and key differences. Often, you’ll get: MCQs on light and dark reactionsDiagram-based identification (chloroplast, pigments)Assertion-reason on C3 and C4 pathwaysConcept questions on factors affecting photosynthesisFocus your revision on process steps, pigment roles, and differences between pathways.

Q: 2. How can I identify expected NEET MCQs from Cellular Respiration topics?

Cellular Respiration MCQs often check your grasp of steps, energy yield, and pathways. To spot important questions, focus on: Sequence of glycolysis, TCA, and ETS stepsATP yield in aerobic vs anaerobic respirationAmphibolic role of respirationPractice numericals related to ATP calculation and Respiratory Quotient.

Q: 3. What are common assertion-reason formats seen in Plant Growth and Development?

Assertion-reason NEET questions typically test on growth phases, hormones, and developmental processes. Prepare for formats like: Hormone function vs plant responseDifference between differentiation, dedifferentiation, and redifferentiationRead explanations carefully, as these questions check your logical understanding, not just facts.

Q: 5. How to effectively practice chapter-wise important questions for Plant Physiology?

Practicing with chapter-wise MCQs and assertion-reason questions helps retain concepts and identify weak areas. Follow this strategy: Start with topic-wise MCQs from recent NEET trendsFocus on diagrams, process steps, and numericalsReview explanations, not just answersAvoid memorizing only; understand concept application.

Q: 6. What are the typical pitfalls in answering NEET Plant Physiology important questions?

Common mistakes include confusing pathway steps, misreading diagrams, and neglecting exceptions. Tips to avoid pitfalls: Memorize stepwise order for glycolysis, TCA, and photosynthesisCarefully read question keywords (e.g., ‘not’, ‘except’)Revise side-by-side differences between C3/C4/Photorespiration

Practice Plant Physiology Important Questions - Free PDF Download

Understanding Plant Physiology is crucial for scoring well in NEET Biology. This chapter covers important basics every NEET aspirant should know. Here, you will find Vedantu’s NEET Important Questions with Answers for Plant Physiology.

The syllabus includes Photosynthesis, Respiration, and Plant Growth and Development. Topics such as pigments, pathways like C3 and C4, ATP formation, phases of plant growth, and plant hormones are covered. All essential processes that plants use to grow and live are explained in simple language.

Answering these questions helps you understand key points and improve your NEET preparation. Practice with the free NEET Important Questions PDF from Vedantu to learn better. Download now to get strong in Plant Physiology.

Practice Plant Physiology Important Questions - Free PDF Download

1. Multiple choice questions.

Q1. Which of the following pigments is directly involved in the photochemical reaction of photosynthesis?

(a) Chlorophyll a
(b) Chlorophyll b
(c) Xanthophyll
(d) Carotene

Answer: (a) Chlorophyll a

Q2. In which part of the chloroplast does the light-dependent reaction of photosynthesis occur?

(a) Outer membrane
(b) Stroma
(c) Thylakoid membrane
(d) Intermembrane space

Answer: (c) Thylakoid membrane

Q3. Which pathway operates when only Photosystem I is functional in photosynthesis?

(a) Non-cyclic photophosphorylation
(b) Cyclic photophosphorylation
(c) Calvin cycle
(d) C4 pathway

Answer: (b) Cyclic photophosphorylation

Q4. The correct sequence of events during aerobic respiration is:

(a) Glycolysis → TCA cycle → Electron transport system
(b) TCA cycle → Glycolysis → Electron transport system
(c) Electron transport system → Glycolysis → TCA cycle
(d) TCA cycle → Electron transport system → Glycolysis

Answer: (a) Glycolysis → TCA cycle → Electron transport system

Q5. Which plant hormone is primarily responsible for promoting cell elongation in plants?

(a) Auxin
(b) Cytokinin
(c) Ethylene
(d) ABA

Answer: (a) Auxin

2. Very Short Answer (VSA).

Q1. Define photorespiration.

Answer: Photorespiration is a process in plants where oxygen is consumed and carbon dioxide is released with no production of ATP or sugar, often occurring when Rubisco binds O₂ instead of CO₂.

Q2. Name the pigment mainly responsible for trapping sunlight in photosynthesis.

Answer: Chlorophyll a is the main pigment responsible for trapping sunlight during photosynthesis.

Q3. What is the respiratory quotient (RQ) when glucose is used as substrate?

Answer: The respiratory quotient (RQ) for glucose is 1, as equal volumes of carbon dioxide are released and oxygen consumed during aerobic respiration.

3. Short Answer Questions.

Q1. Briefly differentiate between C₃ and C₄ pathways.

Answer: In the C₃ pathway, CO₂ is initially fixed into a 3-carbon compound (PGA) in mesophyll cells, and is sensitive to photorespiration. In the C₄ pathway, CO₂ is fixed into a 4-carbon compound (oxaloacetic acid) in mesophyll cells and transported to bundle sheath cells, reducing photorespiration.

Q2. Explain the chemiosmotic hypothesis for ATP synthesis in chloroplast.

Answer: The chemiosmotic hypothesis states that ATP synthesis occurs due to proton gradient developed across the thylakoid membrane. As protons move back into the stroma through ATP synthase, their energy is used to convert ADP and inorganic phosphate into ATP during photosynthesis.

Q3. What happens during seed germination at the cellular level?

Answer: During seed germination, the embryo absorbs water, enzymes activate, stored food is mobilized, and rapid cell division and elongation begin. The radicle emerges first followed by the plumule, leading to establishment of a new plant.

4. True or False Questions.

Q1. Glycolysis occurs in the mitochondria of the cell.

Answer: False

Q2. Cytokinins promote cell division in plants.

Answer: True

Q3. Photorespiration decreases the efficiency of photosynthesis.

Answer: True

3. Fill in the Blanks Questions.

Q1. The process by which pyruvate is converted into ethanol under anaerobic conditions is called __________.

Answer: fermentation

Q2. ABA (abscisic acid) mainly acts as a __________ growth regulator in plants.

Answer: inhibitory

Q3. The Calvin cycle takes place in the __________ of the chloroplast.

Answer: stroma

Why Plant Physiology Matters for NEET Students

Understanding Plant Physiology concepts is essential for NEET aspirants. These topics, like photosynthesis and respiration, form the backbone of Biology and help students solve critical questions quickly and confidently in the NEET exam.

Practicing important questions on Plant Growth and Development builds a strong foundation. By focusing on syllabus-aligned questions, you’ll find yourself better equipped to tackle both direct and application-based questions in the NEET Biology section.

With Vedantu’s NEET resources on Plant Physiology, students can practice a wide range of exam-focused questions. This makes revision smoother, clarifies complex concepts, and boosts confidence for the Biology section in NEET.

FAQs on Plant Physiology Important Questions for NEET Biology - 2026

1. What types of important questions are usually asked from Photosynthesis in NEET Biology?

Photosynthesis questions in NEET focus on mechanisms, pathways, and key differences. Often, you’ll get:

MCQs on light and dark reactions
Diagram-based identification (chloroplast, pigments)
Assertion-reason on C3 and C4 pathways
Concept questions on factors affecting photosynthesis

Focus your revision on process steps, pigment roles, and differences between pathways.

2. How can I identify expected NEET MCQs from Cellular Respiration topics?

Cellular Respiration MCQs often check your grasp of steps, energy yield, and pathways. To spot important questions, focus on:

Sequence of glycolysis, TCA, and ETS steps
ATP yield in aerobic vs anaerobic respiration
Amphibolic role of respiration

Practice numericals related to ATP calculation and Respiratory Quotient.

3. What are common assertion-reason formats seen in Plant Growth and Development?

Assertion-reason NEET questions typically test on growth phases, hormones, and developmental processes. Prepare for formats like:

Hormone function vs plant response
Difference between differentiation, dedifferentiation, and redifferentiation

Read explanations carefully, as these questions check your logical understanding, not just facts.

4. Which subtopics from Plant Physiology are most exam-focused for diagram-based questions?

NEET often includes diagrams from these areas:

Structure of chloroplast and labeled parts
Pathways of C3 and C4 cycles
Seed germination stages

Study labeling, flowcharts, and functional aspects for these diagrams. Practice drawing to reinforce memorization.

5. How to effectively practice chapter-wise important questions for Plant Physiology?

Practicing with chapter-wise MCQs and assertion-reason questions helps retain concepts and identify weak areas. Follow this strategy:

Start with topic-wise MCQs from recent NEET trends
Focus on diagrams, process steps, and numericals
Review explanations, not just answers

Avoid memorizing only; understand concept application.

6. What are the typical pitfalls in answering NEET Plant Physiology important questions?

Common mistakes include confusing pathway steps, misreading diagrams, and neglecting exceptions. Tips to avoid pitfalls:

Memorize stepwise order for glycolysis, TCA, and photosynthesis
Carefully read question keywords (e.g., ‘not’, ‘except’)
Revise side-by-side differences between C3/C4/Photorespiration

7. How can assertion-reason and numerical questions from Plant Physiology be approached in NEET?

For assertion-reason, check if the reason correctly explains the assertion using core concepts like photophosphorylation or hormone action. For numericals (usually on ATP yield/Respiratory Quotient):

Keep formulas handy
Plug values in sequence, avoid skipping steps

Always double-check units and logical flow.