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Home/NEET/biology/photosynthesis in higher plants
Curated PYQ Collection

Top 50 Most Repeated PHOTOSYNTHESIS IN HIGHER PLANTS PYQs | NEET

A curated collection of the most important questions from PHOTOSYNTHESIS IN HIGHER PLANTS, fully solved with step-by-step concepts to prepare for NEET.

Question #1

Practice Question

A.Stomatal opening at night
B.C4 acid decarboxylation
C.Bundle sheath cells
D.Kranz anatomy

Concept Applied

CAM plants open stomata at night to fix COâ‚‚ into malic acid, reducing daytime water loss and photorespiration....

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.3‑phosphoglycerate (3‑PGA)
B.1,3‑bisphosphoglycerate
C.Glyceraldehyde‑3‑phosphate
D.Ribulose‑5‑phosphate

Concept Applied

CO₂ combines with RuBP to give an unstable six‑carbon intermediate that immediately splits into two molecules of 3‑phosphoglycerate (3‑PGA), the first...

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.Mesophyll (bundle‑sheath) cells
B.Mesophyll cells
C.Bundle‑sheath cells
D.Guard cells

Concept Applied

C₄ plants first fix CO₂ into a four‑carbon acid in the mesophyll cells using PEP carboxylase. The C₄ acid is then shuttled to bundle‑sheath cells wher...

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.RuBP
B.PEP
C.OAA
D.PGA

Concept Applied

PEP carboxylase fixes CO2 into PEP to form OAA....

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.Light
B.CO2
C.Temperature
D.pH

Concept Applied

Light, CO2, and temperature are the factors affecting photosynthesis....

Read Full Step-by-Step Solution →

Question #6

Practice Question

A.P680
B.P700
C.Chl-a
D.Chl-b

Concept Applied

PS I has a special pair of Chl-a called P700....

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.Oxygen photolysis
B.NADPH oxidation
C.Proton gradient
D.Electron transport

Concept Applied

Chemiosmosis uses H+ gradient across thylakoid membrane for ATP synthesis....

Read Full Step-by-Step Solution →

Question #8

Practice Question

A.C3 plants under high Oâ‚‚, low COâ‚‚
B.C4 plants under high COâ‚‚
C.CAM plants at night
D.C3 plants under high COâ‚‚

Concept Applied

Photorespiration occurs in C3 plants when RuBisCO binds Oâ‚‚ instead of COâ‚‚ under high Oâ‚‚, low COâ‚‚....

Read Full Step-by-Step Solution →

Question #9

Practice Question

A.Oxaloacetate
B.Phosphoglyceraldehyde
C.3-Phosphoglycerate
D.Ribulose bisphosphate

Concept Applied

RuBisCO fixes COâ‚‚ to RuBP, forming 3-PGA as the first stable compound in C3 plants....

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.Night; reduces water loss while allowing COâ‚‚ uptake.
B.Day; maximizes photosynthetic rate.
C.Dawn; synchronizes with sunrise for optimal light capture.
D.Evening; prevents herbivory.

Concept Applied

Crassulacean Acid Metabolism (CAM) plants open stomata at night to take up COâ‚‚ when transpiration rates are low, storing COâ‚‚ as malic acid for use dur...

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.Daytime
B.Night
C.Noon only
D.Always closed

Concept Applied

CAM plants open stomata at night to reduce transpirational water loss during hot days....

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.P680
B.P700
C.Chlorophyll a
D.Chlorophyll b

Concept Applied

PS I has a reaction center chlorophyll a molecule called P700, absorbing 700 nm light....

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.Ferredoxin
B.Plastoquinone
C.Cytochrome b6f
D.Plastocyanin

Concept Applied

Electrons move: PSII → PQ → Cyt b6f → PC → PSI → Fd....

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.Chloroplast, Mitochondria
B.Chloroplast, Peroxisome
C.Mitochondria, Peroxisome
D.Chloroplast, Peroxisome, Mitochondria

Concept Applied

Process occurs in chloroplasts, peroxisomes, and mitochondria....

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Photosynthesis in Hi...

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Photosynthesis in Hi...

Read Full Step-by-Step Solution →

Question #17

Practice Question

A.Stomatal opening at night
B.C4 acid decarboxylation
C.Bundle sheath cells
D.Kranz anatomy

Concept Applied

CAM plants open stomata at night to fix COâ‚‚ into malic acid, reducing daytime water loss and photorespiration....

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.3‑phosphoglycerate (3‑PGA)
B.1,3‑bisphosphoglycerate
C.Glyceraldehyde‑3‑phosphate
D.Ribulose‑5‑phosphate

Concept Applied

CO₂ combines with RuBP to give an unstable six‑carbon intermediate that immediately splits into two molecules of 3‑phosphoglycerate (3‑PGA), the first...

Read Full Step-by-Step Solution →

Question #19

Practice Question

A.Mesophyll (bundle‑sheath) cells
B.Mesophyll cells
C.Bundle‑sheath cells
D.Guard cells

Concept Applied

C₄ plants first fix CO₂ into a four‑carbon acid in the mesophyll cells using PEP carboxylase. The C₄ acid is then shuttled to bundle‑sheath cells wher...

Read Full Step-by-Step Solution →

Question #20

Practice Question

A.RuBP
B.PEP
C.OAA
D.PGA

Concept Applied

PEP carboxylase fixes CO2 into PEP to form OAA....

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.Light
B.CO2
C.Temperature
D.pH

Concept Applied

Light, CO2, and temperature are the factors affecting photosynthesis....

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.P680
B.P700
C.Chl-a
D.Chl-b

Concept Applied

PS I has a special pair of Chl-a called P700....

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.Oxygen photolysis
B.NADPH oxidation
C.Proton gradient
D.Electron transport

Concept Applied

Chemiosmosis uses H+ gradient across thylakoid membrane for ATP synthesis....

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.C3 plants under high Oâ‚‚, low COâ‚‚
B.C4 plants under high COâ‚‚
C.CAM plants at night
D.C3 plants under high COâ‚‚

Concept Applied

Photorespiration occurs in C3 plants when RuBisCO binds Oâ‚‚ instead of COâ‚‚ under high Oâ‚‚, low COâ‚‚....

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.Oxaloacetate
B.Phosphoglyceraldehyde
C.3-Phosphoglycerate
D.Ribulose bisphosphate

Concept Applied

RuBisCO fixes COâ‚‚ to RuBP, forming 3-PGA as the first stable compound in C3 plants....

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.Night; reduces water loss while allowing COâ‚‚ uptake.
B.Day; maximizes photosynthetic rate.
C.Dawn; synchronizes with sunrise for optimal light capture.
D.Evening; prevents herbivory.

Concept Applied

Crassulacean Acid Metabolism (CAM) plants open stomata at night to take up COâ‚‚ when transpiration rates are low, storing COâ‚‚ as malic acid for use dur...

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.Daytime
B.Night
C.Noon only
D.Always closed

Concept Applied

CAM plants open stomata at night to reduce transpirational water loss during hot days....

Read Full Step-by-Step Solution →

Question #28

Practice Question

A.P680
B.P700
C.Chlorophyll a
D.Chlorophyll b

Concept Applied

PS I has a reaction center chlorophyll a molecule called P700, absorbing 700 nm light....

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Ferredoxin
B.Plastoquinone
C.Cytochrome b6f
D.Plastocyanin

Concept Applied

Electrons move: PSII → PQ → Cyt b6f → PC → PSI → Fd....

Read Full Step-by-Step Solution →

Question #30

Practice Question

A.Chloroplast, Mitochondria
B.Chloroplast, Peroxisome
C.Mitochondria, Peroxisome
D.Chloroplast, Peroxisome, Mitochondria

Concept Applied

Process occurs in chloroplasts, peroxisomes, and mitochondria....

Read Full Step-by-Step Solution →

Question #31

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Photosynthesis in Hi...

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Photosynthesis in Hi...

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.Stomatal opening at night
B.C4 acid decarboxylation
C.Bundle sheath cells
D.Kranz anatomy

Concept Applied

CAM plants open stomata at night to fix COâ‚‚ into malic acid, reducing daytime water loss and photorespiration....

Read Full Step-by-Step Solution →

Question #34

Practice Question

A.3‑phosphoglycerate (3‑PGA)
B.1,3‑bisphosphoglycerate
C.Glyceraldehyde‑3‑phosphate
D.Ribulose‑5‑phosphate

Concept Applied

CO₂ combines with RuBP to give an unstable six‑carbon intermediate that immediately splits into two molecules of 3‑phosphoglycerate (3‑PGA), the first...

Read Full Step-by-Step Solution →

Question #35

Practice Question

A.Mesophyll (bundle‑sheath) cells
B.Mesophyll cells
C.Bundle‑sheath cells
D.Guard cells

Concept Applied

C₄ plants first fix CO₂ into a four‑carbon acid in the mesophyll cells using PEP carboxylase. The C₄ acid is then shuttled to bundle‑sheath cells wher...

Read Full Step-by-Step Solution →

Question #36

Practice Question

A.RuBP
B.PEP
C.OAA
D.PGA

Concept Applied

PEP carboxylase fixes CO2 into PEP to form OAA....

Read Full Step-by-Step Solution →

Question #37

Practice Question

A.Light
B.CO2
C.Temperature
D.pH

Concept Applied

Light, CO2, and temperature are the factors affecting photosynthesis....

Read Full Step-by-Step Solution →

Question #38

Practice Question

A.P680
B.P700
C.Chl-a
D.Chl-b

Concept Applied

PS I has a special pair of Chl-a called P700....

Read Full Step-by-Step Solution →

Question #39

Practice Question

A.Oxygen photolysis
B.NADPH oxidation
C.Proton gradient
D.Electron transport

Concept Applied

Chemiosmosis uses H+ gradient across thylakoid membrane for ATP synthesis....

Read Full Step-by-Step Solution →

Question #40

Practice Question

A.C3 plants under high Oâ‚‚, low COâ‚‚
B.C4 plants under high COâ‚‚
C.CAM plants at night
D.C3 plants under high COâ‚‚

Concept Applied

Photorespiration occurs in C3 plants when RuBisCO binds Oâ‚‚ instead of COâ‚‚ under high Oâ‚‚, low COâ‚‚....

Read Full Step-by-Step Solution →

Question #41

Practice Question

A.Oxaloacetate
B.Phosphoglyceraldehyde
C.3-Phosphoglycerate
D.Ribulose bisphosphate

Concept Applied

RuBisCO fixes COâ‚‚ to RuBP, forming 3-PGA as the first stable compound in C3 plants....

Read Full Step-by-Step Solution →

Question #42

Practice Question

A.Night; reduces water loss while allowing COâ‚‚ uptake.
B.Day; maximizes photosynthetic rate.
C.Dawn; synchronizes with sunrise for optimal light capture.
D.Evening; prevents herbivory.

Concept Applied

Crassulacean Acid Metabolism (CAM) plants open stomata at night to take up COâ‚‚ when transpiration rates are low, storing COâ‚‚ as malic acid for use dur...

Read Full Step-by-Step Solution →

Question #43

Practice Question

A.Daytime
B.Night
C.Noon only
D.Always closed

Concept Applied

CAM plants open stomata at night to reduce transpirational water loss during hot days....

Read Full Step-by-Step Solution →

Question #44

Practice Question

A.P680
B.P700
C.Chlorophyll a
D.Chlorophyll b

Concept Applied

PS I has a reaction center chlorophyll a molecule called P700, absorbing 700 nm light....

Read Full Step-by-Step Solution →

Question #45

Practice Question

A.Ferredoxin
B.Plastoquinone
C.Cytochrome b6f
D.Plastocyanin

Concept Applied

Electrons move: PSII → PQ → Cyt b6f → PC → PSI → Fd....

Read Full Step-by-Step Solution →

Question #46

Practice Question

A.Chloroplast, Mitochondria
B.Chloroplast, Peroxisome
C.Mitochondria, Peroxisome
D.Chloroplast, Peroxisome, Mitochondria

Concept Applied

Process occurs in chloroplasts, peroxisomes, and mitochondria....

Read Full Step-by-Step Solution →

Question #47

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Photosynthesis in Hi...

Read Full Step-by-Step Solution →

Question #48

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Photosynthesis in Hi...

Read Full Step-by-Step Solution →

Question #49

Practice Question

A.Stomatal opening at night
B.C4 acid decarboxylation
C.Bundle sheath cells
D.Kranz anatomy

Concept Applied

CAM plants open stomata at night to fix COâ‚‚ into malic acid, reducing daytime water loss and photorespiration....

Read Full Step-by-Step Solution →

Question #50

Practice Question

A.3‑phosphoglycerate (3‑PGA)
B.1,3‑bisphosphoglycerate
C.Glyceraldehyde‑3‑phosphate
D.Ribulose‑5‑phosphate

Concept Applied

CO₂ combines with RuBP to give an unstable six‑carbon intermediate that immediately splits into two molecules of 3‑phosphoglycerate (3‑PGA), the first...

Read Full Step-by-Step Solution →
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