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Photosynthesis in Higher Plants: NEET MCQ Questions [100+ Solved]

Below are the NEET MCQ questions on Class 11 Biology Chapter “Photosynthesis in Higher Plants” based on the NCERT textbook. Solve the below free NEET mock test for a better understanding of the various topics. 100+ important MCQs (multiple choice questions) are given in this NEET question bank.

“Photosynthesis in Higher Plants” is the 13th chapter in the unit “Plant Physiology” of class XI or class 11th Biology NCERT. Do note that NEET (which is conducted by NTA) is based on NCERT textbooks so they are a must-have. You can also download PDFs of NCERT textbooks.

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  1. As part of the electron transport chain during terminal oxidation, what is the cytochrome that donates electrons to O2?
    (a) Cytochrome-b
    (b) Cyto-C
    (c) Cyto-a3
    (d) Cyto-f

(c) Cyto-a3

  1. Isolated thylakoids suspended in a culture medium with CO2 and H2O do not produce hexose due to the absence of?
    (a) ATP
    (b) Enzyme
    (c) Proteins
    (d) Hill reagent

(b) Enzyme

  1. What is the light-harvesting complex (LHC) made up of?
    (a) one molecule of chl a.
    (b) very few molecules of chl a.
    (c) hundreds of pigment molecules bound to proteins.
    (d) Chl a + Chl c + protein + DNA.

(c) hundreds of pigment molecules bound to proteins.

  1. The light reaction of photosynthesis does not produce which of the following?
    (a) O2
    (b) ATP, NADPH2
    (c) High-energy electrons
    (d) Sugar

(d) Sugar

  1. What is found in the stroma of higher plants’ chloroplasts?
    (a) Light-independent reaction enzymes
    (b) Light-dependent reaction enzymes
    (c) Ribosomes
    (d) Chlorophyll

(a) Light-independent reaction enzymes

  1. In chlorophyll structure, four pyrrole rings are attached to Mg through _ atom.
    (a) N
    (b) C
    (c) H
    (d) O

(a) N

  1. Which family has many plants that are C4 type?
    (a) Malvaceae
    (b) Solanaceae
    (c) Cruciferae
    (d) Graminae

(d) Graminae

  1. What are C4 plants found among?
    (a) Only gramineae
    (b) Only monocot
    (c) Only dicot
    (d) Monocots as well as dicots

(d) Monocots as well as dicots

  1. In C4 plants, carbon refixation occurs in chloroplasts of?
    (a) Palisade tissue
    (b) Spongy Mesophyll
    (c) Bundle sheath cells
    (d) Guard cells

(c) Bundle sheath cells

  1. Photosynthesis begins with which of the following steps?
    (a) ATP formation
    (b) Glucose formation
    (c) Photolysis of water
    (d) Activation of chlorophyll by light

(d) Activation of chlorophyll by light

  1. Which of the following takes place during photosynthesis?
    (a) Both CO2 and water get oxidized
    (b) Both CO2 and water get reduced
    (c) Water is reduced and CO2 is oxidized
    (d) Carbon dioxide gets reduced and water gets oxidised

(d) Carbon dioxide gets reduced and water gets oxidised

  1. What pigment contains Cu++?
    (a) Ferredoxin
    (b) Plastocyanin
    (c) Plastoquinone
    (d) Cytochrome

(b) Plastocyanin

  1. What is required to synthesize one glucose molecule during the Calvin cycle?
    (a) 12 molecules of ATP and 18 molecules of NADPH2
    (b) 6 molecules of ATP and 12 molecules of NADPH2
    (c) 18 molecules of ATP and 12 molecules of NADPH2
    (d) 12 molecules each of NADPH2

(c) 18 molecules of ATP and 12 molecules of NADPH2

  1. In photorespiration, what is the first reaction?
    (a) Carboxylation
    (b) Decarboxylation
    (c) Oxygenation
    (d) Phosphorylation

(c) Oxygenation

  1. During photosynthesis, which of the following categories of organisms does not produce oxygen?
    (a) Red algae
    (b) Photosynthetic bacteria
    (c) C4 plants with Kranz anatomy
    (d) Blue-green algae

(b) Photosynthetic bacteria

  1. Cyanobacteria with pigment-containing membranous extensions are?
    (a) Basal bodies
    (b) Pneumatophores
    (c) Chromatophores
    (d) Heterocysts

(c) Chromatophores

  1. What is the limiting factor in photosynthesis under normal field conditions?
    (a) CO2
    (b) Light
    (c) Water
    (d) None of these

(a) CO2

  1. What statement about the C4 pathway is false?
    (a) It requires more energy than the C3 pathway for the production of glucose
    (b) It overcomes loss due to photorespiration
    (c) The CO2 acceptor is a C3 compound
    (d) It is inhibited by high CO2 concentration

(c) The CO2 acceptor is a C3 compound

  1. Where is the chlorophyll in chloroplasts located?
    (a) grana
    (b) pyrenoid
    (c) stroma
    (d) both grana and stroma

(a) grana

  1. What is the first electron acceptor in photosystem-I?
    (a) Cytochrome
    (b) Plastocyanin
    (c) An iron-sulphur protein
    (d) Ferredoxin

(c) An iron-sulphur protein

  1. What is the relation between incident light and CO2 fixation rates at low light intensities?
    (a) sigmoid
    (b) linear
    (c) parabola
    (d) hyperbola

(b) linear

  1. In photosynthesis, what is the first substance a green plant produces?
    (a) A simple sugar
    (b) Starch
    (c) Fats
    (d) Proteins

(a) A simple sugar

  1. What is the first electron acceptor of an excited chlorophyll molecule of photosystem II?
    (a) Quinone
    (b) Cytochrome
    (c) Iron-sulphur protein
    (d) Ferredoxin

(a) Quinone

  1. What is the ultimate gain of light reaction?
    (a) ATP & NADPH2
    (b) NADPH2
    (c) Only ATP
    (d) Only O2

(a) ATP & NADPH2

  1. What happens during photophosphorylation?
    (a) CO2 and O2 unite
    (b) Phosphoglyceric acid is produced
    (c) Aspartic acid is formed
    (d) Light energy is converted into chemical energy by the production of ATP

(d) Light energy is converted into chemical energy by the production of ATP

  1. During the light reaction of photosynthesis, which of the following occurs?
    (a) Chlorophyll is produced
    (b) Water splits to form 2H+ & O2
    (c) CO2 is given off as a waste
    (d) Sugar is formed from CO2 and water

(b) Water splits to form 2H+ & O2

  1. The transfer of hydrogen from light to dark reactions in photosynthesis occurs through?
    (a) DPN
    (b) DNA
    (c) ATP
    (d) NADP

(d) NADP

  1. Ferredoxin is composed of which of the following elements?
    (a) Copper
    (b) Manganese
    (c) Zinc
    (d) Iron

(d) Iron

  1. During the photochemical reaction of photosynthesis, which of the following occurs?
    (a) Liberation of O2 takes place
    (b) Formation of ATP and NADPH2 take place
    (c) Liberation of O2, formation of ATP, and NADPH2 takes place
    (d) Assimilation of CO2 takes place

(c) Liberation of O2, formation of ATP, and NADPH2 takes place

  1. What is the process of splitting water in photosynthesis called?
    (a) Dark reaction
    (b) Photolysis
    (c) Electron transfer
    (d) Phototropism

(b) Photolysis

  1. Where is the enzyme rubisco found?
    (a) chloroplast
    (b) mitochondria
    (c) cytoplasm
    (d) nucleus

(a) chloroplast

  1. In photosynthesis, what is the first stable intermediate product?
    (a) Glucose
    (b) Formaldehyde
    (c) Phosphoglyceric acid
    (d) Phosphoglyceraldehyde

(c) Phosphoglyceric acid

  1. Who gave the principle of limiting factors?
    (a) Hill
    (b) Blackman
    (c) Arnon
    (d) Calvin

(b) Blackman

  1. Where does photorespiration begin in C3 plants?
    (a) Phosphoglycerate
    (b) Glycerate
    (c) Glycine
    (d) Phosphoglycolate

(d) Phosphoglycolate

  1. Where does the oxygen that is liberated during photosynthesis come from?
    (a) CO2
    (b) H2O
    (c) chlorophyll
    (d) phosphoglyceric acid

(b) H2O

  1. The maximum amount of CO2 is fixed by what?
    (a) Green plants
    (b) Phytoplanktons
    (c) Zooplanktons
    (d) Bacteria

(b) Phytoplanktons

  1. What statement about the Calvin- Benson cycle is false?
    (a) Light energy is not required for the cycle to proceed.
    (b) Carbon dioxide is assimilated into sugars.
    (c) Ribulose 1, 5-bisphosphate (RuBP) is regenerated.
    (d) None of the above

(a) Light energy is not required for the cycle to proceed.

  1. What is PEPCo associated with?
    (a) CAM plants
    (b) C3-plants
    (c) C4-plants
    (d) None of these

(c) C4-plants

  1. During photosynthesis in C4 plants, C4 acid undergoes decarboxylation in _____ to produce C3 acid (pyruvic acid) and ______.
    (a) mesophyll, O2
    (b) bundle sheath, CO2
    (c) grana, CO2
    (d) bundle sheath, CO2

(d) bundle sheath, CO2

  1. Oxygen-18 (heavy oxygen) has been used by scientists to reveal that oxygen released during photosynthesis comes from molecules of?
    (a) carbon dioxide
    (b) water
    (c) glucose
    (d) chlorophyll

(b) water

  1. Choose the incorrect statement.
    (a) C4 pathway for CO2 fixation was discovered by Hatch and Slack
    (b) CO2 is essential for photosynthesis
    (c) Addition of sodium carbonate in water retards the photosynthetic rate in Vallisneria
    (d) Phloem is the principal pathway for the translocation of solutes

(c) Addition of sodium carbonate in water retards the photosynthetic rate in Vallisneria

  1. For cyclic photophosphorylation, which is incorrect?
    (a) No O2 given off
    (b) No water consumed
    (c) No NADPH2 synthesized
    (d) PS–I and PS–II are involved

(d) PS–I and PS–II are involved

  1. Each molecule of CO2 fixed & reduced in photosynthesis in the Calvin Cycle requires how much ATP & NADPH?
    (a) 2 ATP & 2 NADPH
    (b) 2 ATP & 3 NADPH
    (c) 3 ATP & 2 NADPH
    (d) 4 ATP & 3 NADPH

(c) 3 ATP & 2 NADPH

  1. Where does photosynthesis take place in blue-green algae?
    (a) Chloroplasts
    (b) Lamellisome
    (c) Heterocysts
    (d) Carotene

(b) Lamellisome

  1. Who plotted the action spectra of photosynthesis using a prism, white light, green alga, Cladophora, and aerobic bacteria?
    (a) Sachs
    (b) Arnon
    (c) Arnold
    (d) Englemann

(d) Englemann

  1. What is the first step in photosynthesis?
    (a) Joining of three carbon atoms to form glucose
    (b) Formation of ATP
    (c) Ionization of water
    (d) Excitement of an electron of chlorophyll by a photon of light.

(d) Excitement of an electron of chlorophyll by a photon of light.

  1. Chloroplasts do not contain which of the following pigments?
    (a) Carotene
    (b) Xanthophyll
    (c) Chlorophyll ‘b’
    (d) Anthocyanin

(d) Anthocyanin

  1. What does the half-leaf experiment prove?
    (a) light is essential for photosynthesis.
    (b) CO2 is essential for photosynthesis.
    (c) O2 is released during photosynthesis.
    (d) chlorophyll is essential for photosynthesis.

(b) CO2 is essential for photosynthesis.

  1. Which pigment is water soluble?
    (a) Chlorophyll
    (b) Carotene
    (c) Anthocyanin
    (d) Xanthophyll

(c) Anthocyanin

  1. Rate of photosynthesis is not dependent on?
    (a) Light duration
    (b) Light intensity
    (c) Light quality (colour)
    (d) Temperature

(a) Light duration

  1. What is the function of the membranous system of grana?
    (a) trapping light energy but no ATP and NADPH2 formation.
    (b) trapping light energy and also for the fixation of CO2.
    (c) ATP and NADPH2 formation but not for light trapping.
    (d) light capturing and also for NADPH2 and ATP formation.

(d) light capturing and also for NADPH2 and ATP formation.

  1. What happens when food accumulates in assimilatory cells?
    (a) Increase in the rate of photosynthesis
    (b) Decrease in the rate of photosynthesis
    (c) No effect
    (d) May increase or decrease

(b) Decrease in the rate of photosynthesis

  1. Why is CO2 generally not limiting for hydrophytes?
    (a) Mesophytes plants fix H2S in their photosynthesis.
    (b) These plants also CO2 have from water in the form of HCO3.
    (c) Glucose is not required for their respiration
    (d) All of the above

(b) These plants also CO2 have from water in the form of HCO3.

  1. A graph plotting CO2 conversion to glucose versus the wavelength of light illuminating a leaf is called what?
    (a) an absorption spectrum
    (b) an action spectrum
    (c) a planck constant
    (d) enzyme kinetics

(b) an action spectrum

  1. Who proposed the two pigment system theory of photosynthesis or the Concept of evidence for the existence of two photosystems in photosynthesis?
    (a) Hill
    (b) Blackman
    (c) Emerson
    (d) Arnon

(c) Emerson

  1. Which scientist proved that bacteria use H2S gas and CO2 to synthesize carbohydrates?
    (a) Van Niel
    (b) Ruben
    (c) Jean Senebier
    (d) Julius Robert Mayer

(a) Van Niel

  1. What is the source of the protons that make up the proton gradient used during photosynthesis?
    (a) glucose
    (b) ATP
    (c) H2 O
    (d) NADPH

(c) H2 O

  1. Why do plants give off oxygen?
    (a) oxygen results from the incorporation of carbon dioxide into sugars.
    (b) plants do not respire since they photosynthesize.
    (c) water is the initial proton donor, leaving oxygen as a photosynthetic by-product.
    (d) All of the above

(c) water is the initial proton donor, leaving oxygen as a photosynthetic by-product.

  1. What does assimilatory power refer to?
    (a) Generation of ATP and NADPH2
    (b) Reduction of CO2
    (c) Splitting of water
    (d) Disintegration of plastids

(a) Generation of ATP and NADPH2

  1. In which of the following is manganese required?
    (a) Nucleic acid synthesis
    (b) Plant cell wall formation
    (c) Photolysis of water during photosynthesis
    (d) Chlorophyll synthesis

(c) Photolysis of water during photosynthesis

  1. What is ferredoxin a component of?
    (a) Hill reaction
    (b) Photosystem-I
    (c) P680
    (d) Photosystem-II

(b) Photosystem-I

  1. ‘Z-scheme’ shows electron transfer involving?
    (a) Bundle sheath cell
    (b) PS I
    (c) PS II
    (d) Both (b) and (c)

(d) Both (b) and (c)

  1. One molecule of glucose is produced by how many cycles of the Calvin cycle?
    (a) Eight
    (b) Two
    (c) Six
    (d) Four

(c) Six

  1. What does the Dichlorophenyl dimethyl urea (DCMU) do?
    (a) Inhibit PS-I
    (b) Inhibit PS-II
    (c) Destroy chloroplast
    (d) Inhibit oxidative phosphorylation

(b) Inhibits PS-II

  1. During a light reaction, how many electrons and protons will be released from the photolysis of each water molecule?
    (a) 2 electrons and 4 protons
    (b) 4 electrons and 3 protons
    (c) 4 electrons and 3 protons
    (d) 2 electrons and 2 protons

(a) 2 electrons and 4 protons

  1. What is the reaction centre for PS-I and PS-II?
    (a) P700 and P680 respectively
    (b) P700 and P680 respectively
    (c) P700 and P680 respectively
    (d) P700 and P680 respectively

(b) P700 and P680 respectively

  1. What is the electron transport chain of the photosynthetic process?
    (a) In the stroma of the chloroplast
    (b) Bound to the thylakoid membranes
    (c) Present in the outer membrane of the chloroplast
    (d) Present in mitochondria

(c) Present in the outer membrane of the chloroplast

  1. From CO2 reduction to sugar formation, all reactions are included in?
    (a) Light reaction
    (b) Photolysis
    (c) Dark reaction
    (d) Hill reaction

(c) Dark reaction

  1. Which of the following is a C4 plant?
    (a) Maize
    (b) Atriplex
    (c) Sugarcane
    (d) All of these

(d) All of these

  1. What enzyme catalyzes the photosynthetic C4 cycle?
    (a) RuDP carboxylase
    (b) PEP carboxylase
    (c) Carbonic anhydrase
    (d) None of these

(b) PEP carboxylase

  1. When NADP is no longer available as an acceptor in photophosphorylation, where do the electrons go?
    (a) cytochrome-f
    (b) plastocyanin
    (c) cytochrome B6
    (d) quinone

(a) cytochrome-f

  1. What is the first reaction in a dark reaction?
    (a) Carboxylation
    (b) Decarboxylation
    (c) Dehydrogenation
    (d) Deamination

(a) Carboxylation

  1. A high CO2 compensation point can be found in which of the following?
    (a) C2 plants
    (b) C3 plants
    (c) C4 plants
    (d) Alpine herbs

(b) C3 plants

  1. Where do the oxygen-consuming reaction(s) occur during photosynthesis?
    (a) stroma of chloroplasts and peroxisomes
    (b) grana of chloroplasts and peroxisomes
    (c) stroma of chloroplasts
    (d) stroma of chloroplasts and mitochondria

(a) stroma of chloroplasts and peroxisomes

  1. Phytochrome’s Pr form absorbs light at what wavelength?
    (a) 680 nm
    (b) 720 nm
    (c) 620 nm
    (d) 640 nm

(a) 680 nm

  1. Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. Which of the following processes will be most affected by this damage?
    (a) The splitting of water.
    (b) The absorption of light energy by chlorophyll.
    (c) The flow of electrons from photosystem II to photosystem I.
    (d) The synthesis of ATP.

(d) The synthesis of ATP.

  1. Where does the malic acid synthesise during CO2 fixation in leaves of C4 plants?
    (a) epidermal cells
    (b) mesophyll cells
    (c) bundle sheath cells
    (d) guard cells

(b) mesophyll cells

  1. The importance of day length in the flowering of plants was first shown in what?
    (a) Lemna
    (b) tobacco
    (c) cotton
    (d) Petunia

(b) tobacco

  1. What statement regarding the light reaction of photosynthesis is true?
    (a) Photosystem I can operate independently of photosystem II.
    (b) Photosystems I and II are activated by different wavelengths of light.
    (c) Photosystems I and II transfer electrons and create proton gradients across the thylakoid membrane.
    (d) All of the above

(d) All of the above

  1. During the light stage of photosynthesis, the photoactivated pigment removes an electron from the hydroxylation derived from the water molecule. The free hydroxyl radical’s fate is that it?
    (a) is broken down into oxygen and a free radical of hydrogen.
    (b) is used to raise the activation level of chlorophyll by donating a positive charge.
    (c) is used to produce adenosine triphosphate from adenosine diphosphate.
    (d) reduces carbon dioxide to sugar.

(a) is broken down into oxygen and a free radical of hydrogen.

  1. What causes the creation of a proton gradient across the thylakoid membrane?
    (a) decrease in proton number in the stroma.
    (b) accumulation of protons in the lumen.
    (c) decrease in the pH in the lumen.
    (d) All of the above

(d) All of the above

  1. What is the first step in the case of the C4 pathway?
    (a) CO2 combines with Ribulose 1,5 diphosphate (RuDP)
    (b) CO2 combines with Phosphoglyceric acid (PGA)
    (c) CO2 combines with Phosphoenolpyruvate (PEP)
    (d) CO2 combines with Ribulose monophosphate (RMP)

(c) CO2 combines with Phosphoenolpyruvate (PEP)

  1. What is the reason for the similarity between the absorption spectrum of chl ‘a’ and the action spectrum of photosynthesis?
    (a) Chl a absorbs both red and blue light maximumly
    (b) Chl a reflects blue light.
    (c) Accessory pigments contribute energy to drive photosynthesis.
    (d) Different wavelengths of light have different energy.

(a) Chl a absorbs both red and blue light maximumly

  1. How do CAM plants differ from C4 plants?
    (a) carbon dioxide is stored as malic acid.
    (b) photosynthesis can occur at night in these plants.
    (c) their stomata close during periods that favour photorespiration.
    (d) they use PEP carboxylase to fix carbon dioxide.

(a) carbon dioxide is stored as malic acid.

  1. In which of the following does oxygenic photosynthesis occur?
    (a) Oscillatoria
    (b) Rhodospirillum
    (c) Chlorobium
    (d) Chromatium

(a) Oscillatoria

  1. What is formed as a result of cyclic photophosphorylation?
    (a) ATP and NADPH
    (b) ATP, NADPH and O2
    (c) ATP
    (d) NADPH

(c) ATP

  1. In the photosynthesis of what plant was PGA discovered as the first CO2 fixation product?
    (a) Bryophyte
    (b) Gymnosperm
    (c) Angiosperm
    (d) Alga

(d) Alga

  1. Which one of the following is a C4 plant?
    (a) Papaya
    (b) Potato
    (c) Maize
    (d) Pea

(c) Maize

  1. Where is “Kranz Anatomy” found?
    (a) Flower
    (b) Seed
    (c) Leaves
    (d) Stem

(c) Leaves

  1. How can we describe the conversion of phosphoglyceric acid to phosphoglyceraldehyde during photosynthesis?
    (a) oxidation
    (b) hydrolysis
    (c) electrolysis
    (d) reduction

(d) reduction

  1. What conditions are C4 plants adapted to?
    (a) Hot and dry climate
    (b) Temperate climate
    (c) Cold and dry climate
    (d) Hot and humid climate

(a) Hot and dry climate

  1. Which is the first carbon dioxide acceptor in C4 plants?
    (a) pyruvate
    (b) phosphoenol pyruvate
    (c) ribulose biphosphate
    (d) ribulose 5, phosphate

(b) phosphoenol pyruvate

  1. During photosynthesis, water is split and oxygen is released during?
    (a) photolysis
    (b) red drop
    (c) Pasteur effect
    (d) Calvin cycle

(a) photolysis

  1. When it comes to photosynthesis, what is the most effective light range?
    (a) Blue
    (b) Green
    (c) Red
    (d) Violet

(c) Red

  1. From which of the following do chemosynthetic bacteria obtain energy?
    (a) sun
    (b) infrared rays
    (c) organic substances
    (d) inorganic chemicals

(d) inorganic chemicals

  1. Where does the energy required by PS II to synthesize ATP come from?
    (a) proton gradient
    (b) electron gradient
    (c) reduction of glucose
    (d) oxidation of glucose

(a) proton gradient

  1. Which of the following are formed during light reactions in photosynthesis?
    (a) ATP and sugar
    (b) hydrogen, O2 and sugar
    (c) ATP, hydrogen donor and O2
    (d) ATP, hydrogen and O2 donor

(c) ATP, hydrogen donor and O2

  1. Why is the dark reaction in photosynthesis called that?
    (a) it can occur in the dark also
    (b) it does not depend on light energy.
    (c) it cannot occur during daylight
    (d) it occurs more rapidly at night

(b) it does not depend on light energy.

  1. For which of the following is PEP the primary CO2 acceptor?
    (a) C4 plants
    (b) C3 plants
    (c) C2 plants
    (d) both C3 and C4 plants

(a) C4 plants

  1. What is splitting of water associated with?
    (a) photosystem I
    (b) lumen of thylakoid
    (c) both photosystem I and II
    (d) the inner surface of the thylakoid membrane

(d) the inner surface of the thylakoid membrane

  1. In the light reaction, what is the correct sequence of electron flow?
    (a) PS II, plastoquinone, cytochromes, PS I, ferredoxin
    (b) PS I, plastoquinone, cytochromes, PS II, ferredoxin
    (c) PS I, ferredoxin, PS II
    (d) PS I, plastoquinone, cytochromes, PS II, ferredoxin

(a) PS II, plastoquinone, cytochromes, PS I, ferredoxin

  1. C3 plants do not contain which of the following enzyme?
    (a) RuBP carboxylase
    (b) PEP carboxylase
    (c) NADP reductase
    (d) ATP synthase

(b) PEP carboxylase

  1. What catalyzes the reaction responsible for the primary fixation of CO2?
    (a) RuBP carboxylase
    (b) PEP carboxylase “
    (c) RuBP carboxylase and PEP carboxylase
    (d) PGA synthase

(c) RuBP carboxylase and PEP carboxylase

  1. The first stable product formed when CO2 is added to PEP is?
    (a) pyruvate
    (b) glyceraldehyde-3-phosphate
    (c) phosphoglycerate
    (d) oxaloacetate

(d) oxaloacetate

  1. In which of the following is Blackman’s law of limiting factor applied?
    (a) respiration
    (b) transpiration
    (c) photorespiration
    (d) photosynthesis

(d) photosynthesis

  1. When does the hill reaction occur?
    (a) high altitude plants
    (b) total darkness
    (c) absence of water
    (d) presence of ferricyanide

(a) high altitude plants

  1. What category of organisms does not produce oxygen during photosynthesis?
    (a) Red algae
    (b) Photosynthetic bacteria
    (c) C4 plants with Kranz anatomy
    (d) Blue-green algae

(b) Photosynthetic bacteria

  1. What is the PAR range?
    (a) 200 nm – 800 nm
    (b) 400 nm – 700 nm
    (c) 350 nm – 550 nm
    (d) 600 nm – 100 nm

(b) 400 nm – 700 nm

  1. Which of the following is true about bundle sheath cells
    (a) Are rich in RuBisCO
    (b) Are rich in PEP carboxylase
    (c) Lack RuBisCO
    (d) Lack both RuBisCO and PEP carboxylase

(a) Are rich in RuBisCO

  1. Chlorophyll is composed of which metal ion?
    (a) Iron
    (b) Copper
    (c) Magnesium
    (d) Zinc

(c) Magnesium

  1. Light energy is directly converted to chemical energy by which pigment?
    (a) Chlorophyll-a
    (b) Chlorophyll-b
    (c) Xanthophyll
    (d) Carotenoid

(a) Chlorophyll-a

  1. Photosynthetically Active Radiation (PAR) occurs at which wavelength (in nm)?
    (a) 100-390
    (b) 390-430
    (c) 400-700
    (d) 760-100,00

(c) 400-700

  1. What is photosynthesis?
    (a) oxidative, exergonic, catabolic
    (b) reductive, endergonic, anabolic
    (c) reductive, exergonic, anabolic
    (d) reductive, endergonic, catabolic

(b) reductive, endergonic, anabolic

  1. What is the proportion of PAR of the total incident solar radiation?
    (a) about 70%
    (b) about 60%
    (c) less than 50%
    (d) more than 80%

(c) less than 50%

  1. How does CAM help plants?
    (a) conserving water
    (b) secondary growth
    (c) disease resistance
    (d) reproduction

(a) conserving water

  1. What is a process that makes an essential difference between C3 and C4 plants?
    (a) Transpiration
    (b) Glycolysis
    (c) Photosynthesis
    (d) Photorespiration

(d) Photorespiration

  1. What is the correct sequence of cell organelles during photorespiration?
    (a) Chloroplast-Golgi bodies-mitochondria
    (b) Chloroplast-Rough Endoplasmic reticulum, Dictyosomes
    (c) Chloroplast-peroxisome-mitochondria
    (d) Chloroplast-vacuole-peroxisome

(c) Chloroplast-peroxisome-mitochondria

  1. In photosynthesis and cellular respiration, the electrons in H2O at the beginning of light reactions attach to _ during respiration.
    (a) O2 to make a new H2O molecule.
    (b) NADPH to make a new glucose molecule.
    (c) pyruvate to make ethanol.
    (d) electron transport carriers to make O

(a) O2 to make a new H2O molecule.

  1. Lack of what causes etiolated plants to form?
    (a) Light
    (b) Hg
    (c) Fe
    (d) Mg

(a) Light

  1. The “Warburg effect” on photosynthesis refers to what?
    (a) Low rate of the process due to O2 supply
    (b) Low rate of the process due to CO2 supply
    (c) Both (a) & (b)
    (d) None of the above

(a) Low rate of the process due to O2 supply

  1. What favours photorespiration?
    (a) Low light intensity
    (b) Low O2 and high CO2
    (c) Low temperature
    (d) High O2 and Low CO2

(d) High O2 and Low CO2

  1. What is C2-cycle also called?
    (a) Glycolate cycle
    (b) Calvin cycle
    (c) Kreb’s cycle
    (d) TCA – cycle

(a) Glycolate cycle

  1. During CO2 fixation in the leaves of C4 plants, malic acid is formed in the cells of what?
    (a) Epidermis
    (b) Mesophyll
    (c) Bundle Sheath
    (d) Phloem

(b) Mesophyll

  1. Chlorophyll ‘a’ differs from chlorophyll ‘b’ in chemical structure due to the difference in?
    (a) CH3 and C2H5
    (b) CH3 and HCH = CH2
    (c) CH3 and CHO
    (d) CHO and CH = CH2

(c) CH3 and CHO

  1. What does RuBisCO stand for?
    (a) Ribulose Biphosphate Carboxylase Oxygenase
    (b) Ribulose Phosphate Carboxylase Oxygenase
    (c) Ribulose Phosphate Carboxylic Oxygenase
    (d) None of the above

(a) Ribulose Biphosphate Carboxylase Oxygenase

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