MCQ Questions For Class 11 Photosynthesis in Higher Plants

Students can refer to MCQ Questions for Class 11 Photosynthesis in Higher Plants provided below. You should solve these questions and compare your answers with the solutions provided below by our teachers. The MCQs for Grade 11 Photosynthesis in Higher Plants have been updated based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS.

Class 11 Photosynthesis in Higher Plants MCQs Questions with Answers

See below free multiple choice questions for Class 11 Photosynthesis in Higher Plants. By practicing these MCQ Questions for Class 11 Biology you will be able to revise the entire course and also test your understanding

MCQ Questions for Class 11 Photosynthesis in Higher Plants

Question. What is/are the function(s) of accessory pigments?
(a) They enable a wider range of wavelength of incoming light to be utilized for photosynthesis
(b) They absorb light and transfer the energy to reaction centre.
(c) They protect reaction centre from photo-oxidation.
(d) All of the above

Question. An energy diagram for the transfer of electrons in the light reactions of photosynthesis in plants is
(a) cyclic photo-phosphorylation
(b) Z-band
(c) Z-Scheme
(d) non-cyclic photo-phosphorylation

Question. Electrons are picked up by an electron acceptor which passes them to an electron transport system consisting of
(a) phytochromes
(b) cytochromes
(c) Z-scheme
(d) redox potential scale

Question. The chemiosmotic mechanism mediates
(a) ATP synthesis.
(b) splitting of water.
(c) reduction of NADP+.
(d) flow of electrons from PS – II to PS – I

Question. ATP synthesis, in photosynthesis involves the
(a) establishment of a protein gradient.
(b) oxidation of water.
(c) reduction of NADP+.
(d) flow of electrons.

Question. In photosynthesis, protons accumulate in the
(a) inner membrane space of mitochondria.
(b) matrix of mitochondria.
(c) lumen of thylakoid.
(d) stroma of thylakoid.

Question. The light-driven synthesis of ATP & NADPH, provides energy and reducing power for the
(a) conversion of inorganic carbon into organic carbon.
(b) fixation of CO2 into trioses.
(c) for the production of sugars.
(d) all of the above.

Question. Splitting of water is related with
(a) photosystem I
(b) photosystem II
(c) both (a) and (b)
(d) cyclic photo-phosphorylation

Question. Correct equation that represents the photolysis of water is
(a) 2H₂O → 4H+ + O₂ + 4e–
(b) H₂O → 4H+ + O₂ + 4e–
(c) 4H₂O → 4H+ + O₂ + 4e–
(d) 2H₂O → 4H+ + 2O₂ + 2e–

Question. No. of carbons in the primary CO₂ fixation product of C₄ plant is
(a) 2
(b) 3
(c) 4
(d) 5

Question. Which was the first CO₂ fixation product formed, in the Calvin experiment, using radioactive labelled ¹⁴C in green algal?
(a) 2-carbon organic compound
(b) 3-carbon organic compound
(c) 4-carbon organic compound
(d) 5-carbon organic compound

Question. Which is the primary CO₂ fixation product in C₄ plant?
(a) 3-phosphoglyceric acid
(b) Oxaloacetic acid
(c) Phosphoenol pyruvate
(d) RuBP

Question. Site of photosynthesis in C₄ plant is
(a) mesophyll cells
(b) bundle sheath cells
(c) Both (a) and
(b) (d) Cytosol

Question. The primary CO₂ acceptor in C₄ plant is
(a) RuBP
(b) phosphoenol pyruvate
(c) PEP carboxylase
(d) PGA

Question. Chloroplast movement is influenced by
(a) light exposure
(b) dark condition
(c) atmospheric condition
(d) number of mesophyll cells

Question. In Calvin cycle, RuBisCO incorporates CO₂ into ribulose, 1, 5-bisphosphate which rapidly splits into
(a) 2 molecules of 3-PGA
(b) 2 molecules of 2-PGA
(c) 3 molecules of 3-PGA
(d) 3 molecules of 2-PGA

Question. The total requirement of ATP & NADPH for each molecule of CO₂ fixed & reduced in photosynthesis in the Calvin cycle is
(a) 2 ATP & 2 NADPH
(b) 2 ATP & 3 NADPH
(c) 3 ATP & 2 NADPH
(d) 4 ATP & 3 NADPH

Question. Fixation of CO₂ molecule through Hatch and Slack pathway requires an enzyme called _________ .
(a) PEPcase
(b) RuBisCO
(c) RuBP carboxylase
(d) oxygenase

Question. Bundle sheath cells
(a) are rich in RuBisCO.
(b) are rich in PEP carboxylase.
(c) lack RuBisCO.
(d) lack both RuBisCO and PEP carboxylase.

Question. In the leaves of C₄ plants, malic acid formation during CO₂ fixation occurs in the cells of
(a) bundle sheath
(b) phloem
(c) epidermis
(d) mesophyll

Question. A process that creates an important difference between C₃ & C₄ plants is called____________.
(a) Calvin benson cycle
(b) photosynthesis
(c) photorespiration
(d) transpiration

Question. Photorespiration is a wasteful process because
(a) there is no synthesis of sugars.
(b) there is no synthesis of ATP or NADPH.
(c) there is no synthesis of phosphoglycerate.
(d) both (a) and (b)

Question. Photorespiration
(a) occurs because oxygen rather than carbon dioxide links to the rubisco enzyme in the Calvin cycle.
(b) occurs more in C₄ than in C₃ plants under identical conditions.
(c) describes the uptake of CO₂ & the release of oxygen in chloroplasts.
(d) All of the above

Question. The principle of limiting factors was proposed by
(a) Blackman
(b) Hill
(c) Arnol
(d) Liebig

Question. By looking at which internal structure of a plant can you tell whether a plant is C₃ or C₄?
(a) Kranz anatomy
(b) Distribution of mesophyll cells
(c) Bundle sheath cells only
(d) Both (a) and (b)

Question. In C₄ plants, the process by which C₄ acid is converted into C₃ acid in the bundle sheath cell is known as
(a) carboxylation
(b) regeneration
(c) reduction
(d) decarboxylation

Question. Plant factors affecting photosynthesis include
(a) number, age, size, and orientation of leaves, mesophyll cells and chloroplast, internal CO₂ conc., the amount of chlorophyll .
(b) nature of leaves, size of mesophyll cells and light.
(c) mesophyll cells, distribution and temperature.
(d) quantity of chlorophyll, size of leaves and CO₂.

Question. Which one of the following is incorrect about the activities associated with PS – I and PS – II in non-cyclic photophosphorylation ?
(a) Water is oxidised in PS – II, but not in PS – I.
(b) Photons (light) are needed to activate both PS – I and PS – II.
(c) Photolysis of water, formation of ATP + NADPH + H occur.
(d) Production of NADPH + H+ is associated with PS – II, but not with PS – I.

Question. Which of the following statement is incorrect?
(a) Photosystem-I receives electrons from photosystem-II.
(b) Photosystem-II receives electrons from photolytic dissociation of water.
(c) Formation of NADPH is associated with photosystem -II.
(d) Reaction centre of photosystem I is P₇₀₀.

Question. Which among the following sentence is incorrect about light reaction?
(a) It is also known as ‘photochemical’ phase.
(b) It includes light absorption, water splitting, oxygen release, and the formation of high-energy chemical intermediates.
(c) Reaction centre consist of single molecule of chl a but 2 molecules of chl b.
(d) The pigments are organised into two discrete photochemical light harvesting complexes (LHC) within PS – I and PS – II.

Question. Which one of the following statement correctly describes the cyclic photophosphorylation?
(a) Cyclic photophosphorylation has both PS-I and PS-II.
(b) Cyclic phosphorylation produces neither ATP nor NADPH + H+.
(c) Water is the ultimate source of e– in cyclic phosphorylation.
(d) Electrons are cycled in cyclic photophosphorylation.

Question. All of the following statements are incorrect for non-cyclic electron transport system, except
(a) Electron transport between PS -II to PS-I produces ATP by substrate level phosphorylation.
(b) In PS-II, the oxidation of two water molecules produces four electrons, four proteins, & a single O₂.
(c) Water is oxidized & electrons are released by PS-I.
(d) PS – II reduces NADP⁺ to NADPH.

Question. Which of the following statement is incorrect?
(a) Site of photosynthesis is mesophyll cells of chloroplast.
(b) In Z-scheme, movement of electrons is uphill in terms of redox potential scale.
(c) In Z-scheme of photosynthesis, the electrons flow from H₂O to NADP+.
(d) ATP synthesis is linked to development of a proton gradient across a membrane.

Question. Which of the following statement is incorrect regarding pigments?
(a) Pigments are substances that have an ability to absorb light, at specific wavelengths.
(b) Chlorophyll b is the chief pigment associated with photosynthesis.
(c) Leaf pigments can be separated by chromatography.
(d) Accessory pigments protect chlorophyll a from photo-oxidation.

Question. Which of the following statement is incorrect ?
(a) H2S, not H₂O, is involved in photosynthesis of purple sulphur bacteria.
(b) Light and dark reactions are stopped in the absence of light.
(c) Calvin cycle occurs in the grana of chloroplast.
(d) ATP is produced during light reaction via chemiosmosis.

Question. Which of the following statement(s) is/are correct about RuBisCO?
(a) It catalyzes the fixation of CO₂.
(b) It has oxygenation & carboxylation both activity.
(c) It is the most abundant protein on earth.
(d) All of the above

Question. Which of the following statements given below is incorrect ?
(a) The C₄ plants respond to higher temperatures while C₃ plants have a much lower temperature optimum.
(b) Tropical plants have a higher temperature optimum than the plants adapted to temperate climates.
(c) Some C₃ plants are allowed to grow in CO₂ enriched atmosphere that leads to higher yields.
(d) Water stress causes the stomata to remain open hence enhancing the CO₂ availability.

Question. Which of the following statements (i-iv) regarding “Splitting of water” is/are correct.
(i) It is photolysis of water which provides H⁺ ions for synthesis of NADPH.
(ii) It provides electrons for photophosphorylation & activation of NADP⁺.
(iii) O₂ is evolved during this process.
(iv) It replenishes O₂ consumed by living beings and combustion.
(a) One
(b) Two
(c) Three
(d) All

Question. Identify the correct statements for ATP synthase.
(i) This enzyme consists of two parts: hydrophobic membrane bound portion called F₀ & a portion that sticks out into stroma called F₁.
(ii) F0 appears to form a channel across the membrane through which proton can pass.
(iii) The conformational change in the F₁ portion of the complex synthesizes ATP.
(iv) The proton motive force that drives the synthesis of ATP is associated with this enzyme.
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i) and (iv) only
(d) All of these

Question. Why C₄ plants are special ? Because,
(i) they have a special type of leaf anatomy.
(ii) they tolerate higher temperatures.
(iii) they show a response to high light intensities.
(iv) they lack a process called photorespiration.
(v) they have greater productivity of biomass.
(a) (i) and (ii)
(b) (i), (iii) and (iv)
(c) (i), (ii), (iii) and (iv)
(d) All of these

Question. Which one of the following statement is incorrect in relation to photorespiration?
(a) It is a characteristic of C₃ plants.
(b) The RuBP binds with O₂ to form one molecule of phosphoglycerate and phosphoglycolate.
(c) There is synthesis of ATP or NADPH.
(d) It occurs in daytime only.

Question. Which of the following statement best support the fact that photorespiration commonly occurs in C₃ plants?
(a) C₃ plants don’t possess Kranz anatomy.
(b) C₃ plants have usually high CO₂ compensation species.
(c) C₃ plants are less efficient in photosynthesis.
(d) C₃ plants are characterized by RuBP oxygenase activity under high oxygen supply.

Question. Consider the following statements with respect to photosynthesis and identify the correct statements.
(i) The first carbon dioxide acceptor in C₄ cycle is PGA.
(ii) In C₃ plants, the first stable product of photosynthesis during dark reaction is RuBP.
(iii) Cyclic photophosphorylation results in the formation of ATP.
(iv) Oxygen which is liberated during photosynthesis comes from water.
(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)

Question. Match the parts given in column I with the events given in column II and choose the correct combination from the options given below.
Column-I Column-II
A. Grana of chloroplast I. Kreb’s cycle
B. Stroma of chloroplast II. Light reaction
C. Cytoplasm III. Dark reaction
D. Mitochondrial matrix IV. Glycolysis
(a) A – IV; B – III; C – II; D – I
(b) A – I; B – II; C – IV; D – III
(c) A – IV; B – I; C – III; D – II
(d) A – II; B – III; C – IV; D – I

Question. The reactions of Calvin cycle not directly dependent on light, but they usually do not occur at night. Why?
(a) Night is often too cold for these reactions to occur.
(b) CO₂ concentration in night is too high for these reactions to occur.
(c) Plants usually open their stomata at night.
(d) Calvin cycle is dependent on the products of light reaction.

Question. To make 100 molecules of glucose, how many molecules of ATP & NADPH are required?
(a) 1800 and 1200 respectively.
(b) 1200 and 1800 respectively.
(c) 1800 and 600 respectively.
(d) 200 and 600 respectively.

Question. Chloroplasts are disrupted and the stroma separated from the lamellae. The isolated stroma will fix CO₂ if it is supplied with
(a) O₂
(b) RuBisCO
(c) light
(d) ATP + NADPH

Question. Which of the following pair is not correctly matched ?
(a) C₃ plant – Maize
(b) C₄ plant – Kranz anatomy
(c) Calvin cycle – PGA
(d) Hatch and Slack pathway – Oxaloacetic acid

Question. Which of the following is incorrectly matched?
(a) Sorghum — Kranz anatomy
(b) PS – II — P₇₀₀
(c) Photorespiration — C₃ plants
(d) PEP carboxylase — Mesophyll cells

Question. In non-cyclic reactions of photosynthesis, electrons from chlorophyll molecules in photosystem-I are used in the formation of NADPH. What is the source of such electrons?
(a) Light
(b) NADPH
(c) Photosystem-I
(d) Photosystem-II, which splits water molecule