NEET Plant Physiology Notes 2026: Master Photosynthesis, Respiration & More

If you’re preparing Plant Physiology for NEET 2026, you’ve probably noticed how quickly the details can pile up. One chapter has pathways, another has experiments and diagrams, and then there are those small NCERT facts that NEET questions love to test. It’s easy to understand a topic today and still mix up the details a week later.

The trick is to stop studying Plant Physiology as a collection of isolated facts. Think about how the processes fit together. Photosynthesis produces the organic molecules that can be used during respiration, while plant growth and development depend on the energy, nutrients, and regulatory signals available to the plant.

As you study, keep coming back to NCERT and ask yourself simple questions: Where does this process occur? What does it require? What does it produce? Why is it important?

Combine that understanding with regular diagram revision and NEET-style MCQ practice, and Plant Physiology starts feeling far more manageable. More importantly, you’ll be learning the concepts instead of trying to memorize pages of information just before the exam.

These NEET Plant Physiology Notes 2026 provide a quick, NCERT-focused revision of important concepts including photosynthesis, respiration in plants, mineral nutrition, transport in plants, and plant growth and development.

The goal is simple: understand the concepts, revise important NCERT points, practise MCQs, and avoid wasting time on unnecessary information.

Quick NEET Tip: Do not study Plant Physiology only by memorising pathways. First understand where a process occurs, why it occurs, and what its major products are. Then revise the NCERT details.

What Is Plant Physiology?

Plant physiology is the branch of botany that studies how plants function. It explains the physical, chemical, and biological processes occurring inside plants.

It includes processes such as:

Absorption and transport of water
Movement of minerals
Photosynthesis
Respiration
Plant growth
Plant development
Action of plant growth regulators

For NEET aspirants, these topics are particularly important because questions can test both conceptual understanding and specific NCERT statements.

Plant Physiology Topics for NEET 2026

Topic	What to Focus On
Photosynthesis	Pigments, light reaction, Calvin cycle, C3/C4 pathways, photorespiration
Respiration in Plants	Glycolysis, fermentation, Krebs cycle, ETS, respiratory quotient
Transport in Plants	Water potential, osmosis, transpiration and translocation
Mineral Nutrition	Essential elements, deficiency symptoms and nitrogen metabolism
Plant Growth & Development	Growth phases, growth regulators, photoperiodism and vernalisation

1. Photosynthesis in Higher Plants

Photosynthesis is the process by which green plants use light energy to synthesize organic compounds from carbon dioxide and water.

A simplified representation is:

CO₂ + H₂O → Carbohydrate + O₂

The process takes place primarily in the chloroplasts of photosynthetic cells.

Structure of Chloroplast

For NEET, remember the relationship between chloroplast structure and photosynthesis.

Thylakoid membranes: Major site of light-dependent reactions.
Grana: Stacks of thylakoids.
Stroma: Site associated with carbon fixation reactions of the Calvin cycle.

Photosynthetic Pigments

Important photosynthetic pigments include:

Chlorophyll a
Chlorophyll b
Xanthophylls
Carotenoids

Chlorophyll a is the chief pigment involved in photosynthesis, while other pigments can function as accessory pigments.

Light Reaction

The light reaction takes place in the thylakoid membrane. During this phase, light energy is converted into chemical energy.

Important events include:

Absorption of light
Excitation of chlorophyll
Electron transport
Photolysis of water
ATP formation
NADPH formation
Release of oxygen

Photosystem I and Photosystem II

Two major photosystems participate in the light reactions:

Photosystem II (PS II): Reaction centre P680
Photosystem I (PS I): Reaction centre P700

NEET Memory Point:
PS II = P680
PS I = P700

Calvin Cycle

The Calvin cycle occurs in the stroma of chloroplasts. It uses ATP and NADPH generated during the light reactions to support carbon fixation and carbohydrate synthesis.

The major stages are:

Carboxylation
Reduction
Regeneration

The enzyme RuBisCO plays a central role in carbon fixation.

C3 and C4 Plants

Feature	C3 Plants	C4 Plants
Initial CO₂ acceptor	RuBP	PEP
First stable product	3-PGA	OAA
Special anatomy	Kranz anatomy absent	Kranz anatomy present
Photorespiration	Significant	Minimized

Examples of C4 plants include maize and sugarcane.

2. Respiration in Plants

Cellular respiration is the process through which cells release usable energy from organic molecules.

In aerobic respiration, glucose is ultimately oxidized with oxygen participating in the overall process.

Major Stages of Aerobic Respiration

Glycolysis
Oxidation of pyruvate
Citric acid/Krebs cycle
Electron transport system and oxidative phosphorylation

Glycolysis

Glycolysis occurs in the cytoplasm. One molecule of glucose is converted into two molecules of pyruvate through a sequence of enzyme-controlled reactions.

Krebs Cycle

In eukaryotic cells, the Krebs cycle takes place in the mitochondrial matrix.

It contributes to the production of reduced electron carriers that subsequently feed electrons into the electron transport system.

Electron Transport System

The electron transport system is located on the inner mitochondrial membrane. Electron transfer is coupled with processes that ultimately drive ATP synthesis.

Respiratory Quotient (RQ)

Respiratory quotient is represented as:

RQ = CO₂ evolved / O₂ consumed

For carbohydrates under aerobic conditions, the RQ is generally 1.

3. Transport in Plants

Plants need an efficient transport system to distribute water, minerals, and organic nutrients.

The major vascular tissues are:

Xylem: primarily involved in transport of water and minerals.
Phloem: involved in translocation of organic food materials.

Transpiration

Transpiration is the loss of water in the form of water vapour from the aerial parts of plants, predominantly through stomata.

Factors affecting transpiration include:

Temperature
Humidity
Wind
Light
Availability of water

Transpiration Pull

Transpiration from leaves contributes to the development of a pulling force that assists the upward movement of water through xylem.

Remember: Water and minerals mainly move through xylem, whereas organic food is transported through phloem.

4. Mineral Nutrition in Plants

Plants require various mineral elements for normal growth, metabolism, reproduction, and completion of their life cycle.

Macronutrients

Macronutrients are required in comparatively larger quantities. Important examples include:

Nitrogen
Phosphorus
Potassium
Calcium
Magnesium
Sulphur

Micronutrients

Micronutrients are required in smaller quantities but remain essential for normal plant functioning.

Examples include:

Iron
Manganese
Zinc
Copper
Boron
Molybdenum
Chlorine
Nickel

Common Deficiency Symptoms

Mineral deficiencies can produce symptoms such as:

Chlorosis
Necrosis
Stunted growth
Premature leaf fall
Inhibition of cell division

For NEET, pay special attention to mobile versus immobile nutrients because the location of deficiency symptoms may depend on nutrient mobility.

5. Plant Growth and Development

Plant growth involves an irreversible increase in size and is associated with cell division, cell enlargement, and differentiation.

Phases of Growth

The major phases commonly studied are:

Meristematic phase
Elongation phase
Maturation phase

Plant Growth Regulators

Growth Regulator	Important Association
Auxins	Cell elongation, apical dominance and rooting
Gibberellins	Stem elongation and breaking certain types of dormancy
Cytokinins	Cell division and delay of senescence
Ethylene	Fruit ripening and several developmental responses
Abscisic Acid (ABA)	Stress responses and dormancy

A useful starting mnemonic is:

A – G – C – E – A
Auxin – Gibberellin – Cytokinin – Ethylene – ABA

Important Plant Physiology Questions for NEET

Question 1

Where does the Calvin cycle occur?

A. Thylakoid lumen
B. Stroma
C. Cytoplasm
D. Mitochondrial matrix

Answer: B. Stroma

Explanation: The enzymes responsible for the Calvin cycle are located in the chloroplast stroma.

Question 2

Which plant growth regulator is commonly associated with breaking seed dormancy?

A. Auxin
B. Gibberellin
C. Abscisic acid
D. Ethylene

Answer: B. Gibberellin

Question 3

The reaction centre of Photosystem I is:

A. P680
B. P700
C. P600
D. P760

Answer: B. P700

Question 4

The first stable product of the C4 pathway is:

A. PGA
B. RuBP
C. Oxaloacetic acid
D. Pyruvate

Answer: C. Oxaloacetic acid (OAA)

Question 5

Glycolysis occurs in the:

A. Mitochondrial matrix
B. Chloroplast
C. Cytoplasm
D. Nucleus

Answer: C. Cytoplasm

How to Study Plant Physiology for NEET 2026

Reading Plant Physiology once is not enough. Use a combination of conceptual learning, NCERT revision, active recall, and MCQ practice.

1. Start With NCERT

Read the relevant NCERT Biology chapters carefully. Pay attention to definitions, examples, diagrams, tables, experimental observations, and statements that can be converted directly into MCQs.

2. Understand Pathways Instead of Blind Memorisation

For pathways such as photosynthesis and respiration, ask yourself:

Where does the process occur?
What is the starting material?
What are the important intermediates?
Which enzymes are important?
What are the major products?
What is the biological significance?

3. Practise Diagrams

Plant Physiology contains several diagram-based concepts. Revise structures and pathways such as:

Chloroplast
Light reactions
Calvin cycle
C4 pathway
Mitochondrion
Respiratory pathway
Stomatal apparatus

4. Solve MCQs Regularly

After completing a topic, solve NEET-style MCQs immediately. Do not only check whether your answer is right or wrong. Analyse why each incorrect option is incorrect.

5. Revise Your Mistakes

Maintain a small mistake notebook or digital revision list containing:

Incorrect MCQs
Confusing NCERT lines
Similar terminology
Important enzymes
Important locations
Exceptions

Plant Physiology Quick Revision Table

Concept	Remember
Light reaction	Thylakoid membrane
Calvin cycle	Chloroplast stroma
PS I	P700
PS II	P680
C3 first stable product	3-PGA
C4 first stable product	OAA
Glycolysis	Cytoplasm
Krebs cycle	Mitochondrial matrix
Water transport	Xylem
Food translocation	Phloem

Download NEET Plant Physiology Notes PDF

Want to revise these concepts offline? Use the downloadable NEET Plant Physiology Notes PDF for quick revision before tests and exams.

Download Plant Physiology Notes PDF

Note: Replace YOUR-PDF-LINK-HERE with your actual PDF or lead-form URL before publishing.

Related NEET Biology Notes

Continue your Biology preparation with these related resources:

Frequently Asked Questions

Is Plant Physiology important for NEET 2026?

Yes. Plant Physiology contains several concept-heavy areas of Botany. Students should prepare the relevant NCERT concepts thoroughly and practise previous-year and NEET-style questions.

Which topics should I focus on in Plant Physiology?

Focus particularly on photosynthesis, respiration, transport processes, mineral nutrition, plant growth, and plant growth regulators according to the syllabus applicable to your examination.

Is NCERT enough for Plant Physiology NEET preparation?

NCERT should be the foundation of your Biology preparation. For stronger performance, combine careful NCERT reading with conceptual explanation, revision, previous-year questions, and MCQ practice.

How can I remember Plant Physiology for NEET?

Use flowcharts, labelled diagrams, comparison tables, active recall, and repeated MCQ practice. Short revision sessions are usually more effective than trying to memorise an entire chapter at once.

Where does the Calvin cycle occur?

The Calvin cycle occurs in the stroma of the chloroplast.

Where does glycolysis occur?

Glycolysis occurs in the cytoplasm.

Final Revision Strategy for NEET 2026

Plant Physiology gets a lot easier when you understand where a process happens, what goes into it, what comes out, which enzymes are involved, and why the process matters to the plant. Once you start making these connections, even complicated pathways become much easier to remember.

Keep NCERT as your main source. Read a small section, make short revision notes, practise the important diagrams, and then test yourself with NEET-level MCQs. Pay special attention to questions you get wrong—they often show you exactly which NCERT concept needs another look.

And don’t try to memorize an entire pathway in one sitting. Break the chapter into smaller concepts and recall them without looking at your notes. A few rounds of active recall and question practice usually work far better than simply rereading the same page again and again.

NEET 2026 Revision Checklist

Read NCERT line by line.
Revise important diagrams.
Learn locations of major reactions.
Compare C3 and C4 pathways.
Revise plant growth regulators.
Practise previous-year questions.
Maintain an error notebook.
Revise difficult concepts repeatedly.

If these NEET Plant Physiology Notes 2026 helped you, bookmark this page for revision and share it with another NEET aspirant.

Keep learning, keep revising, and make NCERT your strongest Biology resource.

NEET Plant Physiology Notes 2026: Master Photosynthesis & More by BHS