Photosynthesis Questions.doc

Photosynthesis Questions: Paper - 011. Sugar moves in phloem vessels as ______.

(a) cellulose(b) glucose(c) starch(d) sucrose

Answer: (d) Glucose is called principle carbohydrate, sucrose is called translocable carbohydrate, starch is called storage carbohydrate and cellulose is called structural carbohydrate

2.

______ ions help in photolysis of water.(a) Mn++(b) Mg++(c) Cl-

(d) both (a) and (c)Answer: (d) Magnoprotein is associated with photolysis of water, which contains Mn++ and Cl- as cofactor.

3.

RUBISCO enzyme is also called as ______.(a) carboxytetra mutase(b) carboxydimutase(c) carboxytrimutase(d) carboxyunimutaseAnswer: (b) RUBISCO is called marker enzyme of chloroplast since it can perform carboxylation as well as oxidation, therefore also called carboxydimutase.

4.

______ is precursor for abscissic acid (ABA)(a) Zeatin(b) Lutein(c) Violaxanthin(d) Mevalonic acidAnswer: (c) Precursor for the biosynthesis of abscissic acid is violaxanthin, a type of xanthophyll found in leaves.

5.

In young leaves ratio of carotene to Xanthophyll is ____.(a) 2 : 1(b) 3: 1(c) 1: 3(d) 1: 2Answer: (d) In young leaves cuticle is thin hence require more production therefore concentration of Xanthophyll is more than carotene which is more protective

6.

Which of the following pigments contains open pyrolle ring?(a) Phycobilins(b) Xanthophylls(c) Chlorophylls(d) β-caroteneAnswer: (a) Chlorophylls are made of closed pyrolle, whereas Phycobilins are made of open pyrolle, Carotenoids are carbon hydrogen derivatives.

7. In which of the following light, rate of

photosynthesis is maximum?(a) white(b) discontinuous white(c) red(d) blueAnswer: (b) Discontinuous white light or intermittent light don’t increase the temperature, hence the rate of photosynthesis is maximum.

8.

Quantum yield of photosynthesis is ______.(a) 13.5 %(b) 8 %(c) 13%(d) 12.5%Answer: (d) Quantum requirement of photosynthesis is 8 quanta, whereas quantum yield is 1/8 x 100 i.e., 12.5%

9.

During light phase of photosynthesis ______ is oxidized and ______ is reduced.(a) CO2 and Water(b) Water and CO2(c) Water and NADP(d) NADPH2 and CO2Answer: (c) During light phase water is oxidized and the released hydrogen is accepted by NADP, hence is reduced to NADPH2.

10.

During dark phase of photosynthesis ______ is oxidized and ______ is reduced(a) CO2 and Water(b) Water and CO2

(c) Water and NADP(d) NADPH2 and CO2Answer: (d) During dark phase the reduced NADPH2 transfer its hydrogen to CO2 which is reduced to carbohydrate.

11.

The visible product of photosynthesis is ______.(a) glucose(b) cellulose(c) starch(d) fructoseAnswer: (c) Starch is visible product since it can be stained with iodine.

12.

To produce 3 glucose molecules ______ ATP and ______ NADPH2 molecules are required.(a) 54, 36(b) 54, 30(c) 36, 60(d) 18, 12Answer: (a) 1 glucose molecule requires 18 ATP and 12 NADPH2

13.

Glycolytic reversal is a part of ______.(a) aerobic respiration(b) anaerobic respiration(c) light phase of photosynthesis(d) dark phase of photosynthesisAnswer: (d) First phase of calvin cycle is called glycolytic reversal, which is a part of dark phase of photosynthesis.

14. RuBp carboxylase acts as RuBp carboxygenase

at ______ CO2 conc. And ______ O2 conc.(a) low, low(b) low, high(c) high, high(d) high, lowAnswer: (b) During photorespiration RUBP carboxylase acts RUBP oxygenase under low CO2 High O2 concentrations.

15.

The source of CO2 during calvin cycle in C4 plant is(a) Malic acid(b) OAA(c) PEP(d) RuDPAnswer: (a) During C4 pathway malic acid undergo decarboxylaton to release CO2.

16.

Dicot which follow C4 pathway is____.(a) wheat(b) Amranthus(c) Maize(d) MangoAnswer: (b) Most of the C4 plant is monocot however exceptional dicot is Amaranthus.

17.

Absorption spectrum of chlorophyll is maximum in _____ light.(a) red(b) blue(c) yellow(d) blue-violetAnswer: (b) Absorption spectrum of chlorophyll is maximum in blue light whereas action spectrum is maximum in red light.

18.

The oxygen molecule in glucose formed during photosynthesis comes from(a) Water(b) Organic acids(c) CO2

(d) atmosphereAnswer: (c) Since glucose is formed form CO2 and hydrogen released from water hence oxygen comes from CO2.

19.

Dimorphic chloroplast are present in ______.(a) zeamays(b) sacchrum officinale(c) sorghum bicolor(d) all of theseAnswer: (d) Dimorphic chloroplast or Kranz anatomy is the character feature of monocot, All the given options are monocot.

20.

Red pigment in tomato is(a) -carotene(b) Anthocyanin(c) Lycopene(d) LuteinAnswer: (c) the biological name of the tomato is lycopersicon esculentum it is due the ther lycopene.

21.

Solarisation refers to ______.(a) formation of sugar with help of water or energy

(b) destruction of chlorophyll(c) synthesis of chl.(d) both b and cAnswer: (b) Destruction of chlorophyll is due harmful light and oxygen called solarization.

22.

Dark reaction requires light reaction for(a) carboxylation of RUBP(b) regeneration of RUBP(c) reduction of PGA(d) formation of hexose sugarAnswer: (c) Product of dark reaction is NADPH2 required for reduction of PGA to PGAL

23.

Emerson effect proves(a) concept of two photosystem in plant(b) photophosphorylation(c) photorespiration(d) there are light and dark reaction in photosynthesisAnswer: (a) The concept of two photosystem in plant was proposed by emerson bases on red drop effect and enhancement effect.

24.

Name a plant which do not perform photosynthesis is(a) Algae(b) Bryophyllum(c) cuscutta(d)Pitcher plantAnswer: (d) Cuscutta is a parasite.

25.

Light reaction of photosynthesis results in formation of ______.(a) O2(b) NADPH + H+(c) ATP(d) All of theseAnswer: (d) During light phase ATP and NADPH is product where as oxygen is byproduct produced during light phase.

Photosynthesis Questions: Paper - 02

Sr. No. Questions Answers

1. C55H70O6N4 Mg is(A) An accessory pigment in photosynthesis(B) Present in PS-II(C) Present in all green plants(D) All of these

Answer: (D)

2. The ionized chl.a+

(A) Receives low energy electron(B) Receives high energy electron(C) Expels low energy electron(D) Expels high energy electron

Answer: (A)

3. In Calvin cycle,(A) fructose 1,6 diphophate undergoes dephosphorylation.

Answer: (A)

(B) ATP is formed during dephosphoylation of fructose(C) 1,3 di PGA undergo phosphorylation(D) none of these

4. What will happen to the rate of photosynthesis if sodium bicarbonate is added in the water having hydrilla plant in a beaker(A) It will remain normal(B) It will be decreased(C) It will be stopped(D) It will be accelerated

Answer: (D)

5. Which of the following gas would disappear from the atmosphere if all the photosynthetic activities were to stop?(A) Nitrogen (B) Carbondioxide(C) Hydrogen(D) Oxygen

Answer: (D)

6. Photo-oxidation of chlorophyll and cell contents as a result of high light intensity is known as(A) Solarization(B) Photolysis(C) Photperiodism(D) Photorespiration

Answer: (A)

7. Temperature is very high but a plant is showing photosynthesis with normal rate, probably it would be(A) C3 plant (B) Mango plant(C) Pea plant(D) Sugarcane plant

Answer: (D)

8. For the process of photosynthesis all except one of the following items are essential. Point out the exception(A) CO2, optimum temperature(B) Glucose and oxygen(C) Water and minerals(D) Light and chlorophyll

Answer: (B)

9. The prerequisities of Calvins cycle are(A) H2O, CO2, ATP(B) ATP, H2O, NADPH2

(C) CO2, ATP, NADPH2

(D) NADPH2, H2O, CO2

Answer: (C)

10. In the calvin cycle, the assimilatory power is used during(A) Formation of PGA(B) Conversion of PGA to PGAL(C) Formation of fructose 1-6 diphsophate from PGAL(D) Formation of glucose from fructose – diphosphate

Answer: (B)

11. Unidirectional flow of e in non-cyclic photophosphorylation is(A) PS II -- e- ---> PS I -- e- ---> NADP -- e- ---> water(B) Water -- e- ---> PSII -- e- ---> PS I -- e- ---> NADP(C) PS I -- e- ---> NADP -- e- ---> water -- e- ---> PS II(D) Water -- e- ---> PS I -- e- ---> PS II -- e- ---> NADP

Answer: (B)

12. Which is sensitive to longer wavelength of light?(A) Photolysis(B) PSI (C) PS II(D) Photophosphorylation

Answer: (B)

13. Phytol tail is present at(A) 3rd carbon of IInd ring(B) 2nd carbon of IIIrd ring(C) 7th carbon of IVth ring(D) 3rd carbon of IVth ring

Answer: (C)

14. Reduction of co-enzyme NADP depends on(A) Reduction of CO2

(B) Evolution of O2

(C) Photolysis of water(D) Formation of ATP

Answer: (C)

15. Loculus is the internal space of(A) Grana (B) Stroma(C) Thylakoid(D) Quantasome

Answer: (C)

16. Calvins cycle involves(A) Oxidative phosphorylation(B) Oxidative carboxylation(C) Reductive carboxylation(D) Reductive phophorylation

Answer: (C)

17. In C4 plants, carboxylation is twice, it can be represented as(A) Pyruvic acid + CO2 malic acid + CO2

(B) RUDP + CO2 and pyruvic acid + CO2

(C) PEPA + CO2 and RUDP + CO2

(D) PEPA + CO2 and malic acid + CO2

Answer: (C)

18. In non-cyclic photophosphorylation, all the participants acts as electron donor and acceptor except(A) Chl-a of PS I (B) Chl-a of PS II(C) NADP (D) Both (A) and (B)

Answer: (C)

19. Ribbon shaped chloroplast is present in(A) Zygnema (B) Spirogyra(C) Chlorobium (D) Chromatinum

Answer: (B)

20. Which of the following protist is a photoautotroph(A) Thiobacillus (B) Ferrobacillus(C) Diatoms(D) Chlorobium

Answer: (C)



1. What happens during light reaction(A) CO2 reacts with H2

(B) Synthesis of PGAL(C) Lysis of water molecule(D) CO2 combines with H2O

Answer: (C)

2. Photosynthesis takes place(A) Only in green light(B) Only in sunlight(C) In visible light obtained from any source(D) Only in high intensity of light

Answer: (C)

3. Chlorophyll-a differes from chlorophyll-b in having---(A) Methly group instead of aldehyde group(B) Aldehyde group instead of methyl group(C) Methyl group instead of ethyl group(D) Only phytol tail instead of head

Answer: (A)

4. In non-cyclic photophosphorylation(A) ATP is generated(B) Both PSI and PSII are involved(C) Electron flow is unidirectional(D) All the above

Answer: (D)

5. During photosynthesis the reaction when PGA is converted into PGAL, is called(A) Isomerization(B) Reduction(C) Oxidation(D) Phosphorylation

Answer: (B)

6. In C3 pathway, the first stable compound is(A) PGAL(B) OAA(C) PGA(D) RUDP

Answer: (C)

7. In con-cyclic photophosphorylation, the electron emitted by P680 is replaced by electron from(A) NADP(B) Water(C) Ferridoxin (D) Chlorophyll-a

Answer: (B)

8. 85-90% (9/10) of all photosynthesis in the world is carried out by(A) Shrubs(B) Algae of the oceans(C) Herbs(D) Scientists in the laboratory

Answer: (B)

9. The source of oxygen evolved during photosynthesis is(A) H2O(B) CO2

(C) chl-a(D) glucose

Answer: (A)

10. In C4 plants, synthesis of glucose occurs in(A) Spongy cells(B) Bundle sheath cells(C) Mesophyll cells(D) Palisade cells

Answer: (B)

11. In cyclic and non-cyclic photophosphorylation, the first acceptor of electron are

Answer: (D)

(A) Plastoquinone and ferridoxin(B) Cyt b6 and cyt. f(C) Ferridoxin in both(D) Ferridoxin and plastoquinone respt.

12. Primary and secondary processes of Photosynthesis takes place in ______ and ______ respectively.(A) Stroma and grana(B) Stroma and lamellae(C) Thylakoid and quantasome(D) Grana and stroma

Answer: (D)

13. Which one occurs during both cyclic and non-cyclic photophosphorylation(A) Formation of ATP(B) Release of O2

(C) Formation of NADPH2

(D) Involvement of both PSI and PSII

Answer: (A)

14. The prerequisities of Calvins cycle are(A) H2O, CO2, ATP(B) ATP, H2O, NADPH2

(C) CO2, ATP, NADPH2

(D) NADPH2, H2O, CO2

Answer: (C)

15. The photochemical process in photosynthesis which needs both PSI and PSII also involves(A) Photolysis of water(B) Z-scheme of electron transfer(C) Synthesis of assimilatory power(D) All of these

Answer: (D)

16. For synthesis of one molecule of glucose, the requirement of ATP and NADPH2 is respectively(A) 15 and 10(B) 12 and 8(C) 30 and 15(D) 18 and 12

Answer: (D)

17. Which of the following element is needed for chlorophyll biosynthesis?(A) Copper(B) Magnesium(C) Calcium(D) Chlorine

Answer: (B)

18. In the calvin cycle, the assimilatory power is used during(A) Formation of 3-PGA(B) Conversion of 3-PGA to 3-PGAL(C) Formation of fructose 1-6 diphsophate from PGAL(D) Formation of glucose from fructose 1-6 diphosphate

Answer: (B)

19. The two enzymes responsible for primary carboxylation in C3 and C4pathway, respectively are(A) RUBP carboxylase and RUBP

Answer: (C)

oxygenase(B) PEP carboxylase and RUBP carboxylase(C) RUBP carboxylase and PEP carboxylase(D) PEP carboxylase and pyruvate carboxylase

20. _______ are placed one above the other to form stack of coins(A) oxysomes(B) F1 particles(C) cristae(D) thylakoids

Answer: (D)

21. During Photosynthesis(A) Both CO2 and water get oxidised(B) Both CO2 and water get reduced (C) Water is oxidised and CO2 is reduced(D) Water reduced and CO2 is oxidized

Answer: (C)

22. Unidirectional flow of e in non-cyclic photophosphorylation is

(A) PS II PS I

NADP water

(B) Water PSII PS

I NADP

(C) PS I NADP

water PS II

(D) Water PS I PS

II NADP

Answer: (B)

23. ATP synthesis during light reaction is(A) Photophosphorylation(B) Photolysis(C) Oxidative phosphorylation(D) Phosphorylation

Answer: (A)

24. In photosynthesis, the first step is(A) Phtolysis of water(B) Production of NADPH2

(C) Photoexcitation of chlorophyll(D) Synthesis of ATP

Answer: (C)

25. Calvin was given Nobel prize in 1961 for his discovery of(A) Mode of carbon fixation(B) Photosynthesis(C) Photolysis of water(D) Light reaction

Answer: (A)



1. The head and tail of chlorophyll are made up of(A) Pyrrole and tetrapyrrole(B) Porphyrine and phytin(C) Pophyrine and phytol(D) Tetrapyrrole and magnesium

Answer: (C)

2. The numbner of photons needed for the evolution of one molecule of oxygen is(A) 8 (B) 2(C) 12(D) 18

Answer: (A)

3. Action spectrum is(A) A graph showing amount of light absorbed(B) A graph showing rate of photosynthesis(C) A graph showing absorption of light(D) A graph showing amount of CO2 released

Answer: (B)

4. C40H56O2 is molecular formula of(A) Xanthophyll(B) Carotenes(C) Chlorophylls (D) Phycobillins

Answer: (A)

5. Quantasome contains(A) 150-200 chlorophyll molecules(B) 200 chlorophyll molecules(C) 230-250 chlorophyll molecules(D) 300-350 chlorophyll molecules

Answer: (C)

6. The rate of photosynthesis is maximum in(A) Blue light (B) Red light(C) Green light (D) Violet light

Answer: (B)

7. Agranal chloroplast is seen in(A) Bundle sheath cells(B) Mesophyll cells(C) Both (A) and (B)(D) Epidermal cell

Answer: (A)

8. The malic acid in bundle sheath chloroplast of C4 plants is decarboxylated to form(A) OAA (B) Pyruvic acid(C) PEPA (D) Aspartic acid

Answer: (B)

9. How many Calvin’s cycle form one glucose molecule(A) 2 (B) 6(C) 4 (D) 8

Answer: (B)

10. CO2 fixing enzymes are present in(A) Stroma lamella(B) Grana lamella

Answer: (D)

(C) Quantasome (D) Stroma

11. PGA is the first stable compound formed in(A) C3 pathway (B) Mesophyll(C) C4 pathway (D) Both (B) and (C)

Answer: (A)

12. The organisms that photosynthesizes but do not evolve any molecular oxygen during the process(A) Blue green algae(B) Mango plant(C) Sulphur bacteria(D) Both (A) and (C)

Answer: (C)

13. C4 plants show very high rate of photosynthesis as compare to C3plants, because of(A) Dicarboxylation(B) Bundle sheath cells(C) Absence of photorespiration(D) All the above

Answer: (C)

14. During photsynthesis, the oxygen in glucose comes from(A) Carbon dioxide(B) Water(C) Both (A) and (B)(D) Oxygen

Answer: (A)

15. Dark reaction require light reaction for(A) Carboxylation of RUDP(B) Reduction of PGA(C) Formation of hexose phosphate(D) Regeneration of RUBP

Answer: (B)

16. Erythrose monophosphate (4C) is formed during(A) CAM pathway(B) C4 pathway(C) Conversion of fructose to glucose(D) Regeneration of RUDP

Answer: (D)

17. Donor and acceptor of electrons is the same chlorophyll molecule in(A) Cyclic phtophosphorylation(B) Photorespiration(C) Substrate level phosphorylation(D) Non-cyclic photophosphorylation

Answer: (A)

18. If a photosynthsing plant releases O18, it is concluded that the plant has been supplied with(A) Water containing O18

(B) Oxygen in the form of ozone(C) Sugar containing O18

(D) Carbon dioxide containing O18

Answer: (A)

19. Which of the following connet the primary and secondary processes of photosynthesis?(A) NADPH2

Answer: (B)

(B) ATP and NADPH2

(C) ATP(D) Ferridoxins

20. C4 plants can perform photosynthesis(A) Even in low light intensity(B) Even in low CO2 concentration(C) Both (A) and (B)(D) Only in high intensity of light and high CO2

Answer: (B)

21. Chemical which absorbs light energy and changes it to chemical energy is(A) Chlorophyll a (B) Chlorophyll b(C) Xanthophyll (D) Carotene

Answer: (A)

22. In Hill’s experiment, Hill used ______ as oxygen acceptor,(A) Hydrogen(B) FAD(C) NADP(D) Haemoglobin

Answer: (D)

23. Fret channel is a another name for(A) Stroma lamellae(B) Intergranal lamellae(C) Grana lamellae(D) Space present in stroma lamellae

Answer: (D)

24. Bundle sheath chloroplast of C4 plants are(A) Large and agranal(B) Large and granal(C) Small and granal(D) Small and agranal

Answer: (A)

25. In C3 pathway, out of 12 molecules of 3-PGAL, how many are used for regeneration of RUDP?(A) 12 (B) 8(B) 10(B) 6

Answer: (C)



1. A photosynthesizing plant is releasing 18O more than the normal. The plant must have been supplied with(a) O3

(b) H2O with 18O(c) CO2 with 18O(d) C6H12O6 with 18O

Answer: (b)

2. A plant is kept in 300 ppm CO2 concentration. What will happen to it (Rajasthan PMT 1985)(a) Plant will die soon (b) Plant will grow but will not die(c) Plant will show normal photosynthesis (d) Respiration will be greatly decreased

Answer: (c)

3. Activation radiation for photosynthesis are represented Answer: (c)

by wavelength of (CBSE 1996)(a) 640-650 nm (b) 600-950 nm(c) 400-700 nm (d) 340-450 nm

4. Aganal chloroplasts occur in(a) C3 plants(b) Hydrophytes(c) C4 Plants(d) Succulents

Answer : (c)

5. All plastids have essentially same structure because (CBSE 1992)(a) They have to perform same function (b) They are localized in aerial parts of plants (c) All plastids store starch, lipid and proteins (d) One type of platid can be differentiated into another type of plastid depending on cell requirements

Answer: (d)

6. Assimilatory power produced in hill reaction and used in Blackman’s reaction refers to(a) Generation of ATP and NADPH2

(b) Reduction of CO2

(c) Splitting of water(d) Disintegration of plastids

Answer : (a)

7. Which wavelength of light carries out photosynthesis in bacteria (Rajasthan PMT 1985)(a) Ultraviolet light (b) Blue(c) Red (d) Far red

Answer: (d)

8. ATP is a source of energy for(a) Light reaction in C4 plants(b) Photophosphorylation(c) Biochemical reactions(d) Photolysis of water

Answer : (c)

9. Bacterial photosynthesis contains(a) PSI(b) PSII(c) Both PSI and PSII(d) None of them

Answer : (a)

10. Bacteriochlorophyll differs from chlorophyll ‘a’ in having (CPMT 1989)(a) One pyrrol with one hydrogen (b) One pyrrol with two hydrogen(c) One pyrrol with three hydrogen(d) One pyrrol with four hydrogen

Answer: (b)

11. Besides water and light, which is more essential as a raw material for food formation (BHU 1979)(a) O2 (b) CO2(c) Mineral salts (d) NAD

Answer: (b)

12. Both respiration and photosynthesis require(a) Sunlight(b) Green cells(c) cytochromes(d) Organic substrate

Answer : (c)

13. C4 cycle was discovered by(a) Hill(b) Calvin

Answer : (c)

(c) Hatch and slack(d) Blackman

14. C4 plants are adapted to (AIIMS 1984)(a) Hot ad dry climate (b) Temperate climate(c) Cold and dry climate (d) Hot and humid climate

Answer: (a)

15. C4 plants belong to(a) Gramineae(b) Monocots(c) Dicots(d) Both monocots and Dicots

Answer : (d)

16. Calvin cycle occurs in (MP PMT 1996)(a) Chloroplast (b) Cytoplasm(c) Mitochondria (d) Glyoxysomes

Answer: (a)

17. Calvin cycle occurs in (BHU 1983)(a) Chloroplasts (b) Cytoplasm(c) Mitochondria(d) Glyoxysomes

Answer : (a)

18. Calvin’s cycle is found in (Raj. PMT 1997)(a) Only C3 plants (b) Only photosynthetic plants(c) All C4 plants (d) All photosynthetic plants

Answer: (d)

19. CAM photosynthesis occurs in plants with (MP PMT 1993)(a) Thin green leaves with reticulate venation (b) Thin green leaves with parallel venation(c) Fleshy green leaves (d) Thin coloured leaves

Answer: (c)

20. Carbon dioxide is fixed in (MP PMT 1999)(a) Light reaction (b) Dark reaction(c) Aerobic respiration (d) Anaerobic respiration

Answer: (b)



1. Carbon dioxide joins the photosynthetic pathway in(a) PSI(b) PSII(c) light reaction(d) Dark reaction

Answer: (d)

2. Chlorophyll a occurs in(a) All photosynthetic autotrophs(b) In all higher plants(c) All oxygen liberating autotrophs(d) All plants except fungi

Answer: (a)

3. Chlorophyll b is(a) C54H70O6N4Mg(b) C55H70O6N4Mg(c) C55H70O5N4Mg

Answer: (b)

(d) C45H72O5N4Mg

4. Chlorophyll is (MP PMT 1996)(a) Soluble in organic solvents (b) Soluble in water(c) Soluble in both organic solvents and water(d) None of the above

Answer: (a)

5. Chlorophyll is present (CPMT 1987)(a) On the surface of chloroplast (b) In the stroma of chloroplast (c) In the grana of chloroplast (d) Dispersed throughout the chloroplast

Answer: (c)

6. Chlorophylls absorb visible light of wavelenghts(a) 400- 500 nm only(b) 300- 400 nm only(c) 600- 800 nm only(d) 400- 500 nm only and 600- 700 nm only

Answer: (d)

7. Chloroplast contains maximum quantity of(a) RuDP -carboxylase(b) Hexokinase(c) Pyruvic carboxylase(d) None

Answer: (a)

8. Chloroplast contians maximum quantity of (BHU 1981)(a) Pyruvic carboxylase(b) Hexokinase(c) RuDP carboxylate (d) None of the above

Answer: (c)

9. Chloroplast fixes (Delhi PMT 1987)(a) O2

(b) H2

(c) CO2 (d) N2

Answer: (c)

10. CO2 acceptor in C3 plants is (CBSE 1995, 96)(a) Xylulose-5-phosphate (b) 3-phosphoglyceric acid(c) Ribulose 1, 5 diphosphate (d) Phoshoenol pyruvic acid

Answer: (c)

11. Constituents of pigment system I are located on(a) Granal thylakoids(b) Stromal thylakoids(c) Outer surface of granal and stromal thylakoids (d) Stroma

Answer: (c)

12. Cyclic photophosphorylation produces(a) NADPH(b) ATP and NADPH(c) ATP , NADPH and O2

(d) ATP only

Answer: (d)

13. Dark reactions of photosynthesis occur in(a) Granal thylakoid membranes(b) Stromal lamella membranes(c) stroma outside photosynthetic lamellae (d) Periplastidial space

Answer: (c)

14. During ATP synthesis, electrons pass through (a) CO2

(b) O2

(c) H2O(d) Cytochromes

Answer: (d)

15. During dark reaction the three carbon atoms of 3-PGA are derived from(a) RuBP only

Answer: (c)

(b) CO2 only(c) RuBP + CO2

(d) RuBP + CO2 + PEP

16. During daylight hours, the rate of photosynthesis is higher than that of respiration, and the ratio of oxygen produced to that of consumed is (CPMT 1984)(a) 1: 1 (b) 10: 1(c) 50: 1 (d) 5: 1

Answer: (b)

17. During photosynthesis when PGA is changed into phosphogycleraldehyde, which of the following reactions occurs? (BHU 1980)(a) Oxidation(b) Reduction(c) Electrolysis(d) Hydrolysis

Answer: (b)

18. Enzymes PEP carboxylase and RuBP caboxylase are located in chloroplasts of(a) C3 plants(b) CAM plants(c) C4 plants(d) both (b) and (c)

Answer: (d)

19. Ferredoxin is a constituent of(a) PSI (b) PSII(c) Hill reaction(d) P680

Answer: (a)

20. First stable product of C4 photosynthesis is(a) Phosphoglyceraldehyde(b) Malic acid(c) PGA(d) RuBP

Answer: (b)



1. For photosynthesis (i.e. for the suynthesis of organic matter), the green plants need only (AFMC 1987) (a) Light (b) Chlorophyll(c) CO2 (d) All of these

Answer: (d)

2. For synthesis of a molecule of glucose, the requirement of ATP and NADPH is respectively(a) 15 and 10(b) 33 and 22(c) 12 and 8(d) 18 and 12

Answer: (d)

3. Formation of ATP in photosynthesis and respiration is an oxidation process which utilizes the energy from(a) Cytochromes(b) Ferredoxin(c) Electrons(d) Carbon dioxide

Answer: (c)

4. Grana refer to (BHU 1984)(a) Stacks of thylakoids in plastids of higher plants(b) A constant in quantum equation(c) Glycolysis of glucose(d) By-product of photosynthesis

Answer: (a)

5. Greatest producers of organic matter are(a) Crop plants(b) Forests(c) Plants of the land area(d) Phytoplankton of oceans

Answer: (d)

6. Hill’s reaction takes place in (CPMT 1986)(a) Dark (b) Light(c) Dark and light both(d) At any time

Answer: (b)

7. How many Calvin cycles form one hexose molecule (CBSE 1996) (a) 2 (b) 6(c) 4 (d) 8

Answer: (b)

8. In a electron transport chain in terminal oxidation the cytochrome which donates electrons to O2 is (CPMT 1990)(a) Cytochrome b (b) Cytochrome c(c) Cytochrome a3 (d) Cytochrome a

Answer: (c)

9. In bacterial photosynthesis, the hydrogen donor is(a) H2O(b) H2SO4

(c) NH3

(d) H2S

Answer: (d)

10. In blue-green algae photosystem-II contain

Answer: (d)

an important pigment concerned with photolysis of water it is called (BHU 1989, 90)(a) B earotene (b) Chlorophyll’ b’(c) Cytochrome ‘c’ (d) Phycocyanin

11. In C3 plants first stable product of photosynthesis during dark reactions is(a) PGA(b) PGAL(c) RuBP(d) Oxalo acetic acid

Answer: (a)

12. In C4 pathway or C4 photosynthesis carbobn dioxide fication occures in chloroplast of (Delhi PMT 1985; CBSE 1995; MP PMT 1997)(a) Palisade tissue (b) Spongy mesophyll(c) Bundle sheath (d) Guard cells

Answer: (b)

13. In C4 plants, Calvin cycle operates in(a) Stroma of bundle sheath chloroplasts(b) Grana of Bundle sheath chloroplasts(c) Grana of mesophyll chloroplasts(d) Stroma od mesophyll chloraplasts

Answer: (a)

14. In C4 plants, initial carbondioxide fixation occurs on chloroplasts of(a) Palisade tissue(b) Spongy parnchyma(c) Guard cells(d) Hypodermis and chlorenchyma

Answer: (b)

15. In C4 plants, synthesis of sugars/ final CO2 fixation occurs in(a) Palisade cells(b) Spongy cells(c) Undifferentiated mesophyll cells(d) Bundle sheath cells

Answer: (d)

16. In case of C4 pathway(a) CO2 combines with PGA(b) CO2 combines with PEP(c) CO2 first combines with RuBP

Answer: (b)

(d) CO2 combines with RMP

17. In chlorophyll ‘a’, third carbon of second pyroll ring is attached with (CBSE 1996)(a) Carboxyl group (b) Magnesium(c) Methyl group (d) Aldehyde group

Answer: (c)

18. In normal chloroplast, the percentage of chlorophyll is (a) 50% (b) 75%(c) 5-10% (d) 95%

Answer: (c)

19. In photosynthesis, oxygen is liberated due to (Delhi PMT 1983; MP PAT 1995; MP PMT 1999)(a) Reduction of carbon dioxide (b) Hydrolysis os carbohydrate(c) Photolysis of water (d) Breakdown of chlorophyll

Answer: (c)

20. In pigment system II, active chlorophyll is(a) P680(b) P700(c) P673(d) P720

Answer: (a)



1. In which of the following the rate of photosynthesis is decreased and is known as red drop (MP PMT 1992)(a) Blue light (b) Green light(c) Red light more than 680 nm (d) Red light less than 680 nm

Answer: (c)

2. Intact chloroplast from green leaves cab be isolated by (AIIMS 1990)(a) Acetone (b) Ethanol(c) Alcohol (d) Sugar solution

Answer: (a)

3. Isotopes employed to study photosynthesis are(a) 11C and 32P(b) 15C and 32P(c) 16C and 15O

Answer: (d)

(d) 14C and 18O

4. Isotopes popularly known to have been used in the study of photosynthesis are(BHU 1985)(a) C14 and O18 (b) C11 and C32(c) C16 and N15 (d) P32 and C15

Answer: (a)

5. Kranz anatomy is typical of(a) C4 plants(b) C3 plants(c) C2 plants(d) CAM plants

Answer: (a)

6. Light energy is conveted into chemical energy in the presence of (MP PMT 1994)(a) Pyrenoids (b) Chloroplasts(c) Ribosomes (d) Mesosomes

Answer: (b)

7. Light is necessary during photosynthesis for (NCERT 1978)(a) Evolution of hydrogen (b) Photolysis of water(c) Heating (d) Breakdown of chlorophyll

Answer: (b)

8. Maize, sugarcane and some other tropical plants have high efficiency of CO2fixation because they operate (a) Calvin cycle(b) Hatch – Slack cycle(c) TCA cycle(d) PP pathway

Answer: (b)

9. Make suitable pair (A) Emerson effect - (a) C4 cycle(B) Hill reaction - (b) Photolysis(C) Calvin’s cycle - (c) C3 cycle(D) Hatch and Slack cycle - (d) Photosystem-I & II(Rajasthan PMT 1997) (a) Aa, Bb, Cc, Dd (b) Aa, Bc, Cd Da(c) Ac, Bd, Ca, Db (d) Ad, Bb, Cc, Da

Answer: (d)

10. Most effective wavelength of light for photosynthesis is(a) green(b) Violet(c) Red(d) Yellow

Answer: (c)

11. NADP is reduced to NADPH in(a) PSI(b) PSII(c) Calvin cycle(d) Noncyclic photophosphorylation

Answer: (d)

12. Nine-tenth of all photosynthesis of world (85-90%) is carried out by(a) Large trees with millions of branches and levess(b) Algae of the ocean(c) Chlorophyll containing ferns of the forest(d) Scientist in the laboratories

Answer: (b)

13. Nobel prize was awarded to the scientist for discovering the pathway of carbon assimilation(a) Watson(b) Krebs(c) Calvin(d) Parnas

Answer: (c)

14. Number of calvin cycles required to generate a molecule of hexose is(a) 2(b) 4(c) 6(d) 8

Answer: (c)

15. One sixth part of the total PGAL produced is used for synthesis of(a) Glucose(b) RuBP(c) RuMP(d) DHAP

Answer: (a)

16. Oxidative phosphorylation occurs during the process of (MP PMT 1994, 98)(a) Protein synthesis (b) N2 fixation(c) Respiration (d) Transpiration

Answer: (b)

17. Oxygen containing carotenoids are(a) Carotenes(b) Xanthophylls(c) Phycobilins (d) Anthocyanins

Answer: (b)

18. Oxygen liberated during photosynthesis comes from(a) CO2

(b) Glucose(c) H2O(d) Fructose

Answer: (c)

19. P700 is a special from of which pigment (Rajasthan PMT 1997) (a) Chlorophyll-b (b) Carotenes(c) Chlorophyll-a (d) Phycobilins

Answer: (c)

20. Path of dark reaction of photosynthesis was traced through the use of(a) 32P

Answer: (b)

(b) 14CO2

(c) 18O2

(d) X-rays



1. PEPA, the first CO2 acceptor in C4 cycle is(a) 5 – C compound(b) 4 – C compound(c) 3 – C compound(d) 2 – C compound

Answer : (c)

2. Photo-oxidation or photolysis of water (in photosynthesis ) occurs in association of(a) Cytochrome B6(b) Plastocyanin(c) PSII(d) PSI

Answer : (c)

3. Photorespiration occurs in(a) Mitochondria(b) All living cells(c) Green photosynthesis parts(d) Root

Answer : (c)

4. Photosynthesis consists of essentially two biological reaction systems, one followed by the other, the second of these system does which of the following(CPMT 1988) (a) Fixes CO2 (b) Traps light energy(c) Synthesizes starch(d) Work only in the presence of light

Answer: (a)

5. Photosynthesis is (JIPMER 1986; CPMT 1988, 90)(a) Oxidative, exergonic, catabolic (b) Reductive, endergonic, anabolic(c) Reductive, exergonic, anabolic (d) Reductive, endergonic, catabolic

Answer: (b)

6. Photosynthesis is a process in which (a) ATP is generated (b) NADH is reduced to NAD(c) Oxidative phosphorylation occurs(d) CO2 is reduced

Answer : (d)

7. Photosynthesis is fastest in(a) Blue light(b) Sunlight(c) Red light(d) Green light

Answer : (b)

8. Photosynthesis is the fastest inBlue lightSun lightRed lightGreen light

Answer: (b)

9. Photosynthetic bacteria and blue-green algae have molecular component of their light-receptor

Answer: (b)

systems(Delhi PMT 1991)(a) Chloroplast (b) Chromatophores(c) Lamellae (d) Grana

10. Photosynthetic phosphorylation is (a) Oxidative process (b) Photo process(c) Both (a) and (d) None of the above

Answer: (b)

11. Photosynthetic pigments found in the chloroplasts occur in(a) Thylakoid membranes(b) Plastoglobules(c) Matrix(d) Chloroplasts envelope

Answer : (a)

12. Photosynthetic pigments in chloroplast are embedded in membrane of (CBSE 1991)(a) Thylakoids (b) Photoglobin(c) Matrix (d) Envelopeof chloroplast

Answer: (a)

13. Photosystem II occurs in(a) Stroma(b) Cytochrome(c) Grana(d) Mitochondrial surface

Answer : (c)

14. Photosystem-I contains (BHU 1983; Rajasthan PMT 1987, 92)(a) Chl a, Chl b, carotenoid and P680 (b) Chl a, Chl b and P690(c) Chl a, Chl b and P700 (d) Chl a, xanthophyll and P700

Answer: (c)

15. Pigment acting as a reaction centre during photosynthesis is(a) Carotene(b) Phytochrome(c) P700(d) Cytochrome

Answer : (c)

16. Pigment system I performs independently(a) Noncyclic photophosphorylation(b) Cyclic photophosphorylation(c) Oxidative phosphorylation(d) Photolysis

Answer : (b)

17. Pigment system-I receives radiant energy and releases electron (MP PMT 1992)(a) Chlorophyll-683 (b) Chlorophyll-673(c) Chlorophyll-695 (d) P-700

Answer: (d)

18. Plants are known as purifiers of air due to process of (MP PMT 1996)(a) Respiration (b) Photosynthesis(c) Transpiration

Answer: (b)

(d) Desiccation

19. PS II performs(a) Reduction of CO2

(b) Photolysis of water(c) Liberation of energy(d) Formation of water

Answer : (b)

20. PS-I gets de-energised electrons from(a) water(b) Plastoquinone(c) Plastocyanin(d) Cytochrome f.

Answer : (c)



1. Quantasomes contain (CPMT 1982; MP PMT 1984)(a) 200 chlorophyll molecules (b) 230 chlorophyll molecules(c) 250 chlorophyll molecules (d) 300 chlorophyll molecules

Answer: (b)

2. Quantasomes occur on the surface of(a) Cristae(b) Plasmalemma(c) Thylakoid membranes(d) Peristromium

Answer : (c)

3. Ribulose biphosphate carboxylase enzyme catalyses the reaction between(a) Oxaloacetic acid and acetyl CoA(b) CO2 and ribulose 1, 5, biphosphate(c) Ribulose biphosphate and phosphoglyceraldehyde(d) PGA and dihydroxy acetone phosphate

Answer : (b)

4. Rubisco content of chloroplast is(a) 5%(b) 20%(c) 11%(d) 16%

Answer : (d)

5. Scientist awarded Nobel prize in 1961 for tracing the path of carbon in photosynthesis was(a) Calvin(b) Ruben(c) Blackman(d) Hatch

Answer : (a)

6. Sugarcane shows high efficiency of CO2 fixation because it performs(a) Calvin cycle(b) EMP pathway(c) Hatch and Slack pathway(d) TCA cycle

Answer : (c)

7. Synthesis of ADP + Pi -----> ATP in grana is(a) Phosphorylation(b) Photophosphorylation(c) Oxidative Phosphorylation(d) Photolysis

Answer : (b)

8. The brown colour of some algae is due to the presence of pigments (Delhi PMT 1991)

Answer: (d)

(a) Chlorophyll (b) Phycocyanin(c) Carotene (d) Fucoxanthin

9. The carbon dioxide acceptor in calvin cycle / C3 plants is(a) Phospho-enol pyruvate (PEP)(b) Ribulose1, 5 – Diphosphate (RuBP)(c) Phosphoglyceric acid (PGA)(d) Ribulose monophosphate (RMP)

Answer : (b)

10. The empirical formula for chlorophyll a is (a) C35H72O5N4Mg(b) C65H70O6N4Mg(c) C55H72O5N4Mg(d) C45H70O6N4Mg

Answer : (c)

11. The enzyme that catalyses carbon dioxide fixation in C4 plants is(a) RuBP carboxylase(b) PEP carboxylase(c) Carbonic anhydrase(d) Carbxydismutase

Answer : (b)

12. The first carbon dioxide acceptor in C4 – plants is(a) Phosphoenol – pyruvic acids(b) Ribulose1, 5 - Diphosphate(c) Oxalo- acetic acid(d) Phosphoglyceric acid

Answer : (a)

13. The first experiment on photosynthesis in flashing light were carried out by (MP PMT 1990)(a) F.F. Blackman (b) Robert Emerson and Arnold(c) Melvin Calvin (d) Robert Hill

Answer: (b)

14. The first food substance plants make in photosynthesis is(a) Sugar(b) Starch(c) Proteins(d) Fats

Answer : (a)

15. The first product of CO2 fixation in C4 plants is(a) OAA(b) PGA(c) Malic acid(d) PEPA

Answer : (a)

16. The first product of CO2 fixation in Hatch and Stack plants is (CPMT 1983) (a) Formation of oxalocetate by carboxylation of phosphoenol pyruvate (PEP in) bundle sheath cells (b) Formation of phoshoglyceric acid in mesophyll cells(c) Formation of bundle sheath cells (d) Formation of oxaloacetate by carboxylation of phosphoenol pyruvate (PEP) in the mesophyll cells

Answer: (d)

17. The first step in photosynthesis is the(a) Joining of 3-carbon atom to form Glucose (b) Formation of ATP(c) Ionization of water(d) Excitement of an electron of chlorophyll by photon of light

Answer : (d)

18. The full expansion of NADP is (Raj. PMT 1997)(a) Nicotinamide adenine diphosphate (b) Nicotinamide adenosine diphosphate(c) Nicotinamide adenine dinucleotide phosphate (d) Nicotinamide adenosine dinucleotide phosphate

Answer: (c)

19. The internal sorce of CO2 in C4 pathway is(a) Oxaloacetic acid(b) Malic acid(c) RuBP(d) Phosphoenol pyruvic acid

Answer : (b)

20. The isotope of carbon used extensively for studies in photosynthesis is(a) 13C(b) 14C(c) 15C(d) 16C

Answer : (b)

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