MCQ on Photosynthesis. We covered all the MCQ on Photosynthesis in this post for free so that you can practice well for the exam.
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Photosynthesis MCQ for Students
Which of the following is a cause of a proton gradient across the thylakoid membrane?
(A) Accumulation of protons in the lumen of the thylakoid
(B) Decrease in protons in the stroma
(C) Decrease in pH in the lumen
(D) All of the above
Option d – All of the above
How many CO₂ molecules are fixed for the formation of one glucose molecule?
(A) 12
(B) 10
(C) 6
(D) 8
Option c – 6
The main difference between C3 and C4 plants is
(A) occurrence of Calvin pathway
(B) presence of bundle sheath cells around the vascular bundles
(C) CO₂ assimilation
(D) presence of mesophyll cells
Option b – presence of bundle sheath cells around the vascular bundles
Select the INCORRECT statement from the following with respect to photosynthesis.
(A) Light energy is utilized in converting ADP to ATP.
(B) Plants utilize atmospheric CO₂ and release O₂.
(C) It is a Physico-chemical process.
(D) In this process, ATP is synthesized using sugars.
Option d – In this process, ATP is synthesized using sugars
Select the INCORRECT statement from the following.
(A) Carotene and xanthophyll pigments absorb radiant energy and transfer this energy to chlorophyll a.
(B) Carotenoids are generally yellow-orange pigments.
(C) Chlorophyll b pigment functions as a reaction center in photosynthesis.
(D) Chlorophyll a is found more than chlorophyll b in the leaves of most plants.
Option c – Chlorophyll b pigment functions as a reaction center in photosynthesis
A thylakoid is isolated from a chloroplast and kept in a medium supplemented with all the requisites of photosynthesis, i.e CO₂, H₂O. Also, light is provided to this experimental setup. However, it does not result in the formation of sugar. Which of the following reaction must have not taken place in the given experiment?
(A) Photochemical reactions
(B) Biochemical reactions
(C) Light reactions
(D) Both (A) and (C)
Option b – Biochemical reactions
The reaction center for PS-I and PS-II is……… respectively.
(A) P700 and P580
(B) P680 and P700
(C) P580 and P700
(D) P700 and P680
Option d – P700 and P680
In the Sorghum plant, CO₂ fixation occurs twice. The enzymes responsible for CO₂ fixation in mesophyll cells and bundle sheath cells are …….. and ………. respectively.
(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 does NOT occur during the photochemical phase of photosynthesis? i. Water splitting ii. Synthesis of sugars iii. Absorption of light iv. Formation of high energy chemical intermediates like ATP and NADPH v. Utilization of ATP and NADPH vi. Release of oxygen
(A) ii and v
(B) i, iii, iv and vi
(C) ii, iii and vi
(D) iv and vi
Option a – ii and v
Read the given statements and select the correct option. Statement I: Each photosystem has a single specific chlorophyll molecule. Statement II: The hundreds of pigment molecules other than chlorophyll bound to proteins constitute Light Harvesting Complex (LHC) The correct statement/s is/are
(A) Statement I
(B) Statement II
(C) Both statements I and II
(D) Neither statement I nor II
Option c – Both statements I and II
Which of the following reaction does NOT occur in the stroma of chloroplast?
(A) CO₂ fixation
(B) Synthesis of sugar
(C) Photochemical reactions
(D) Dark reaction
Option c – Photochemical reactions
Which of the following option has both C4 plants?
(A) Pea, Hibiscus
(B) Corn, Sorghum
(C) Maize, sunflower
(D) Potato, wheat
Option b – Corn, Sorghum
Which of the following is considered a wasteful process?
(A) Splitting of water in non-cyclic photophosphorylation
(B) Cyclic photophosphorylation
(C) Photorespiration
(D) Chemiosmosis
Option c – Photorespiration
Light energy-capturing reactions of photosynthesis occur in
(A) grana of chloroplast
(B) stroma of chloroplast
(C) mitochondria
(D) cytoplasm
Option a – grana of chloroplast
When the graph showing the action spectrum of photosynthesis was plotted, the following observations were made. Which of the following is the INCORRECT observation?
(A) Chlorophyll a is the chief pigment associated with photosynthesis.
(B) The Blue and red region of the spectrum shows a higher rate of photosynthesis.
(C) Except for blue and red regions of the spectrum, photosynthesis does not occur in other wavelengths of the visible spectrum.
(D) Accessory pigments enable a wider range of wavelengths of incoming light to be utilized for photosynthesis.
Option c – Except for blue and red regions of the spectrum, photosynthesis does not occur in other wavelengths of the visible spectrum.
Select the INCORRECT statement from the following.
(A) Noncyclic photophosphorylation cannot take place in the stroma lamellae.
(B) The stroma lamellae lack PS II as well as NADP reductase enzyme.
(C) In cyclic photophosphorylation, photosystem I and II are connected through an electron transport chain.
(D) Cyclic photophosphorylation results only in the synthesis of ATP, but not of NADPH + H
Option c – In cyclic photophosphorylation, photosystem I and II are connected through an electron transport chain.
Water stress
(A) causes closure of stomata
(B) reduces the surface of leaves
(C) causes wilting of leaves
(D) all of these
Option d – all of these
Which of the following statement is CORRECT about the C4 pathway?
(A) The first stable compound oxalo acetic acid is formed in the bundle sheath cells by carboxylation of phosphoenol pyruvate (PEP).
(B) Malic and aspartic acids are formed in bundle sheath cells which are transported to mesophyll cells.
(C) Calvin cycle occurs in mesophyll cells of C4 plants.
(D) The C4 acid Oxaloacetate is formed in the mesophyll cells by carboxylation of phosphoenol pyruvate (PEP).
Option d – The C4 acid Oxaloacetate is formed in the mesophyll cells by carboxylation of phosphoenol pyruvate (PEP)
Select the INCORRECT statement from the following with respect to the Z scheme of light reaction.
(A) During the Z scheme of light reaction, electrons in the reaction center of PS I become excited on receiving red light of wavelength 680.
(B) It is associated with the splitting of water.
(C) There is the evolution of O₂.
(D) In photosystem II, the reaction center chlorophyll absorbs 680 nm wavelength of red light.
Option a – During the Z scheme of light reaction, electrons in the reaction center of PS I become excited on receiving red light of wavelength 680.
Select the INCORRECT pair from the following.
(A) Primary CO₂ acceptor in C4 plants – PEP
(B) Plants that show Kranz anatomy-C3 plants
(C) Cells of C4 plants in which the Calvin cycle occurs – Bundle sheath cells.
(D) The enzyme present in bundle sheath cells of C4 plants – RuBisCO
Option b – Plants that show Kranz anatomy-C3 plants
The reduction stage in the Calvin cycle results in the formation of
(A) RuBP
(B) 3- Phosphoglycerate
(C) Triose phosphate
(D) NADPH
Option c – Triose phosphate
Select the INCORRECT statement from the following with respect to photosynthesis. ( MCQ on Photosynthesis )
(A) Photosynthesis is a primary source of all food on the earth.
(B) Photosynthesis leads to the release of oxygen in the atmosphere.
(C) Photosynthesis is a physicochemical process.
(D) Photosynthesis is a catabolic process.
Option d – Photosynthesis is a catabolic process.
Which of the following is regenerated in the C3 cycle? ( MCQ on Photosynthesis )
(A) RuBP
(B) OAA
(C) Aspartic acid
(D) Phosphoglycerate
Option a – RuBP
Select the INCORRECT statement about accessory pigments.
(A) These pigments enable a wider range of wavelengths of incoming light to be utilized for photosynthesis.
(B) These pigments receive light energy absorbed by chlorophyll a.
(C) These pigments protect chlorophyll from photo-oxidation.
(D) These pigments include chlorophyll b, xanthophylls, and carotenoids.
Option b – These pigments receive light energy absorbed by chlorophyll a.
We covered all the MCQ on photosynthesis above in this post for free so that you can practice well for the exam.
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