Quick Quiz
Questions ▼
MCQ on Photosynthesis. We covered all the MCQ on Photosynthesis in this post for free so that you can practice well for the exam.
Install our MCQTUBE Android app from the Google Play Store and prepare for any competitive government exams for free.
These types of competitive MCQs appear in exams like SSC CGL, CHSL, JE, MTS, Stenographer, CPO, Railway Group-D, NTPC, ALP, JE, RPF, Tech, Bank, Delhi Police Constable, UP Lekhpal, DSSSB, DDA ASO, BPSC Teaching, Defence, UPSSSC, UPSC (Pre), UPP, SI, UPTET, UPPCS, BPSC, BSSC, SBI, IBPS, LIC, State PCS, CDS, NDA, Assistant Commandant, and other Competitive Examinations, etc.
We have divided the NEET syllabus into several small posts on our website for your convenience.
You will get their respective links in the related posts section provided below.
Related Posts:
- NEET Biology Mock Test Chapter Wise Free
- Bio Mock Test NEET
- MCQ on Environment Ecology and Biodiversity
Photosynthesis MCQ for Students
What leads to the development of a proton gradient across the thylakoid membrane?
A. Protons building up inside the thylakoid lumen
B. Reduction of proton concentration in the stroma
C. Lowering of pH within the thylakoid lumen
D. All of these
Option d – All of these
How many molecules of carbon dioxide are required to produce one molecule of glucose?
A. 12
B. 10
C. 6
D. 8
Option c – 6
What is the major distinguishing feature between C3 and C4 plants?
A. Presence of the Calvin cycle
B. Existence of bundle sheath cells around vascular tissues
C. CO₂ fixation mechanism
D. Arrangement of mesophyll cells
Option b – Existence of bundle sheath cells around vascular tissues
Which of the following statements regarding photosynthesis is incorrect?
A. Light energy is used to convert ADP into ATP
B. Plants absorb CO₂ from the air and release oxygen
C. It is both a physical and chemical process
D. ATP is formed using sugar molecules
Option d – ATP is formed using sugar molecules
Identify the incorrect statement regarding plant pigments.
A. Carotene and xanthophyll pass energy to chlorophyll a
B. Carotenoids are typically orange or yellow
C. Chlorophyll b serves as the primary reaction center
D. Chlorophyll a is more abundant than chlorophyll b in leaves
Option c – Chlorophyll b serves as the primary reaction center
A thylakoid is placed in a medium containing CO₂, water, and exposed to light, yet no sugar is formed. Which reaction is missing?
A. Light-dependent reactions
B. Light-independent reactions
C. Photochemical process
D. Both A and C
Option b – Light-independent reactions
What are the reaction centers of Photosystem I and II respectively?
A. P700 and P580
B. P680 and P700
C. P580 and P700
D. P700 and P680
Option d – P700 and P680
In Sorghum, CO₂ is fixed twice. Which enzymes carry out this process in mesophyll and bundle sheath cells?
A. RuBisCO and PEP carboxylase
B. RuBisCO and NADP reductase
C. RuBP oxygenase and RuBP carboxylase
D. PEP carboxylase and RuBisCO
Option d – PEP carboxylase and RuBisCO
Which of the following events does not happen during the light phase of photosynthesis?
A. Splitting of water molecules
B. Production of sugars
C. Absorption of light
D. Formation of ATP and NADPH
Option a – Splitting of water molecules
Choose the correct option based on the statements.
Statement I: Each photosystem has a unique chlorophyll molecule.
Statement II: Light Harvesting Complex (LHC) consists of pigments other than chlorophyll attached to proteins.
A. Only Statement I
B. Only Statement II
C. Both I and II
D. Neither I nor II
Option c – Both I and II
Which reaction does not occur in the chloroplast stroma?
A. Carbon fixation
B. Glucose synthesis
C. Light-dependent reactions
D. Dark reactions
Option c – Light-dependent reactions
Which pair includes only C4 plants?
A. Pea and Hibiscus
B. Corn and Sorghum
C. Maize and Sunflower
D. Potato and Wheat
Option b – Corn and Sorghum
Which process in plants is considered energetically wasteful?
A. Water splitting during non-cyclic photophosphorylation
B. Cyclic photophosphorylation
C. Photorespiration
D. Chemiosmotic mechanism
Option c – Photorespiration
Where do the light-dependent reactions in photosynthesis take place?
A. Grana of the chloroplast
B. Chloroplast stroma
C. Mitochondria
D. Cytoplasm
Option a – Grana of the chloroplast
Which of the following observations regarding the action spectrum of photosynthesis is incorrect?
A. Chlorophyll a is the main pigment in photosynthesis
B. Red and blue light result in the highest photosynthetic rate
C. Photosynthesis only occurs under red and blue wavelengths
D. Accessory pigments broaden the light absorption range
Option c – Photosynthesis only occurs under red and blue wavelengths
Identify the incorrect statement from the following.
A. Stroma lamellae are not the site for non-cyclic photophosphorylation
B. PS II and NADP reductase are both absent in the stroma lamellae
C. Photosystem I and II are linked through an electron transport chain in cyclic photophosphorylation
D. Cyclic photophosphorylation leads to ATP production without generating NADPH
Option c – Photosystem I and II are linked through an electron transport chain in cyclic photophosphorylation
What is the effect of water stress on plants?
A. It leads to stomatal closure
B. It decreases the surface area of leaves
C. It results in leaf wilting
D. It causes all of the above changes
Option d – It causes all of the above changes
Which statement accurately describes the C4 pathway?
A. Oxaloacetic acid is synthesized in the bundle sheath cells by carboxylation of PEP
B. Malic and aspartic acids are produced in bundle sheath cells and move to mesophyll cells
C. The Calvin cycle occurs within the mesophyll cells of C4 plants
D. Oxaloacetate is formed in mesophyll cells through the carboxylation of phosphoenol pyruvate
Option d – Oxaloacetate is formed in mesophyll cells through the carboxylation of phosphoenol pyruvate
Choose the incorrect statement related to the Z-scheme of the light reaction.
A. In the Z-scheme, electrons in PS I are excited by red light of 680 nm
B. The splitting of water molecules takes place
C. Oxygen is released during the process
D. PS II absorbs red light with a wavelength of 680 nm
Option a – In the Z-scheme, electrons in PS I are excited by red light of 680 nm
Find the incorrectly matched pair.
A. Primary CO₂ acceptor in C4 plants – PEP
B. Kranz anatomy – C3 plants
C. Bundle sheath cells – Site of Calvin cycle in C4 plants
D. RuBisCO – Present in bundle sheath cells of C4 plants
Option b – Kranz anatomy – C3 plants
What is produced during the reduction phase of the Calvin cycle?
A. Ribulose bisphosphate (RuBP)
B. 3-phosphoglycerate
C. Triose phosphate
D. NADPH
Option c – Triose phosphate
Which of the following statements about photosynthesis is not correct?
A. It serves as the primary food source for all organisms on Earth
B. It contributes to oxygen release into the environment
C. It is both a physical and chemical process
D. It is a breakdown (catabolic) process
Option d – It is a breakdown (catabolic) process
Which molecule is regenerated during the C3 photosynthetic pathway?
A. RuBP
B. Oxaloacetate (OAA)
C. Aspartic acid
D. Phosphoglycerate
Option a – RuBP
Identify the incorrect statement regarding accessory pigments.
A. These pigments allow plants to utilize a wider range of light wavelengths for photosynthesis
B. These pigments obtain energy transferred from chlorophyll a
C. They safeguard chlorophyll from photo-oxidation
D. Accessory pigments include chlorophyll b, carotenoids, and xanthophylls
Option b – These pigments obtain energy transferred from chlorophyll a
We covered all the MCQ on photosynthesis above in this post for free so that you can practice well for the exam.
Check out the latest MCQ content by visiting our mcqtube website homepage.
Also, check out:
