NEET Biology Photosynthesis In Higher Plants MCQs Set A

Question: Choose incorrect w.r.t. photosynthesis

• a) Oxygen is evolved as a by-product in all photosyntheic organisms
• b) It is a physico-chemical process
• c) Occurs in unicellular and multicellular photoautotrophs
• d) Anabolic and reductive process

Answer: Oxygen is evolved as a by-product in all photosyntheic organisms

Question: A milestone contribution to the understanding of photosynthesis was made by Cornelius van Niel, which was based on the studies of

• a) Bacteria
• b) Alga
• c) Angiospermic plant
• d) Lower plant

Answer: Bacteria

Question: The essential role of air in the growth of green plants was revealed by

• a) Priestley
• b) Van Niel
• c) Blackmann
• d) Emerson

Answer: Priestley

Question: Moll’s half leaf experiment was done to show _____ was required for photosynthesis

• a) CO₂
• b) Light
• c) Chlorophyll
• d) H₂O

Answer: CO₂

Question: Curve showing the effectiveness of different wavelength of light in photosynthesis was first given by Engelmann using all, except

• a) Unicellular green alga Chlorella
• b) Prism to split the light in its components
• c) Filamentous green alga Cladophora
• d) Suspension of aerobic bacteria

Answer:  Unicellular green alga Chlorella

Question: Grana present in chloroplast refers to

• a) Stacks of thylakoids
• b) Stroma lamellae
• c) Stacks of quantasomes
• d) Double membranous envelope

Answer: Stacks of thylakoids

Question: Photosystem is composed of

• a) More than one is correct
• b) Reaction centre
• c) Light harvesting complex
• d) Accessory pigments

Answer: More than one is correct

Question: In the chloroplast, the stroma lamellae lack the

• a) NADP reductase, PS II
• b) PS II, PS I
• c) PS I, NADP reductase
• d) NADP reductase enzyme, P₇₀₀

Answer: NADP reductase, PS II

Question:  Which equation represents the process of photosynthesis most adequately?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The movement of electrons as per Z-scheme in light reaction is

• a) Both
• b) Uphill in redox potential scale
• c) Downhill in redox potential scale
• d) None of these

Answer: Both

Question: The assimilatory power produced during light reaction in green algae is

• a) ATP, NADPH + H⁺
• b) NAD⁺
• c) NADP
• d) ATP & NADH

Answer: ATP, NADPH + H⁺

Question: The protons formed by splitting of water are released in the

• a) Lumen of the thylakoids
• b) Outer side of the membrane
• c) Stroma of chloroplast
• d) None of these

Answer: Lumen of the thylakoids

Question: The oxygen liberated during the photosynthesis comes from

• a) Water
• b) Carbohydrates
• c) Photosynthetic enzymes
• d) CO₂

Answer: Water

Question: Chemiosmotic hypothesis for generation of ATP during light reaction was first explained by

• a) P. Mitchell
• b) Hill
• c) Arnold
• d) Van Niel

Answer: P. Mitchell

Question: The photosystem connected with splitting of water is

• a) PS II
• b) PS I
• c) Carotenoid
• d) P₇₀₀

Answer: PS II

Question: NADPH is generated through

• a) Non-cyclic photophosphorylation
• b) Anaerobic respiration
• c) Cyclic photophosphorylation
• d) Glycolysis

Answer: Non-cyclic photophosphorylation

Question:

• a) Four
• b) Three
• c) One
• d) Two

Answer: Four

Question:

• a) Three
• b) Five
• c) Four
• d) Two

Answer: Three

Question:

• a) RuBP
• b) PGA
• c) PEP
• d) OAA

Answer: RuBP

Question:

• a) 3-PGA
• b) Starch
• c) OAA
• d) Pyruvate

Answer: 3-PGA

More Questions.........................................

Question: Which among the following is not a step in Calvin cycle?

• a) Photophosphorylation
• b) Carboxylation
• c) Reduction
• d) Regeneration

Answer: Photophosphorylation

Question:

• a) RuBP carboxylase
• b) RuBP oxygenase
• c) Pyruvate decarboxylase
• d) PEP carboxylase

Answer: RuBP carboxylase

Question: Regeneration of four molecules of RuBP in C₃ cycle requires the expenditure of _____ ATP.

• a) 4
• b) 3
• c) 2
• d) 1

Answer: 4

Question: The enzyme RuBP carboxylase

• a) Activity occurs in C₃ and C₄ plants
• b) It present in inner thylakoid membrane
• c) Is low temperature sensitive enzyme
• d) None of these

Answer: Activity occurs in C₃ and C₄ plants

Question: Which of the following statements is not true regarding the C₄ plants?

• a) Granal chloroplast is present in bundle sheath cells
• b) Decarboxylation process occurs in bundle sheath cells
• c) They show kranz anatomy
• d) PEPcase enzyme activity occurs in mesophyll cells

Answer: Granal chloroplast is present in bundle sheath cells

Question:

• a) OAA
• b) OAA
• c) 3-PGA
• d) Malic Acid

Answer: OAA

Question:

• a) Bundle sheath cells
• b) Palisade leaf cells
• c) Mesophyll cells
• d) Spongy mesophyll

Answer: Bundle sheath cells

Question:

• a) The primary acceptor of CO₂ during carbon fixation
• b) Type of pigments involved in photosynthesis
• c) Type of end products of photosynthesis
• d) Number of NADPH that are consumed during the starch synthesis process

Answer: The primary acceptor of CO₂ during carbon fixation

Question: Which one of the following is a C₄ plant?

• a) Maize
• b) Pea
• c) Potato
• d) Papaya

Answer: Maize

Question: The CO₂ fixation during the Hatch and Slack pathway occurs in

• a) Mesophyll cells
• b) Bundle sheath cell cytoplasm
• c) Large thick walled cells
• d) Vascular bundles

Answer: Mesophyll cells

Question: ‘Kranz’ anatomy of leaves is found in

• a) C₄ plants
• b) C₃ plants
• c) CAM plants
• d) All plants

Answer: C₄ plants

Question: The enzyme required for the CO₂ fixation in the C₄ cycle is

• a) PEP carboxylase
• b) RuBP oxygenase
• c) RuBP carboxylase
• d) PGA dehydrogenase

Answer: PEP carboxylase

Question: Which of the following statement is correct regarding the C₄ plants?

• a) More than one option is correct
• b) Photorespiration is absent
• c) Mesophyll cells lack the RuBisCO enzyme
• d) The carbon fixation is catalysed by PEP carboxylase

Answer: More than one option is correct

Question: RuBisCO in C₄ plants shows minimum oxygenase activity due to

• a) Decarboxylation of C₄ acid
• b) Formation of C₄ acid
• c) Abundance of RuBisCO
• d) Cyclic photophosphorylation

Answer: Decarboxylation of C₄ acid

Question: The primary acceptor of CO₂ in C₄ plants is

• a) Phosphoenol pyruvic acid
• b) Malic acid
• c) RuBP
• d) OAA

Answer: Phosphoenol pyruvic acid

Question: A wasteful process which involves oxidation of organic compounds in plants in presence of light is called

• a) Photorespiration
• b) PCR Cycle
• c) Bioluminiscence
• d) Hill’s reaction

Answer: Photorespiration

Question: PEPcase and RuBisCO in C₄ plants are present respectively in

• a) Cytoplasm and stroma
• b) Stroma and cytoplasm
• c) Cytoplasm and thylakoids
• d) Stroma and thylakoids

Answer: Cytoplasm and stroma

Question: Identify the incorrect match

• a)

  

• b) RuBP oxygenase activity – Chloroplast
• c) Regeneration of PEP – Mesophyll cells
• d)

  

Answer:

Question: Law of limiting factor was given in

• a) 1905
• b) 1920
• c) 1915
• d) 1950

Answer: 1905

Question: Which of the following would rarely be a limiting factor for photosynthesis?

• a) Light
• b) Carbon dioxide
• c) Temperature
• d) Chlorophyll

Answer: Light

Question:

• a) Absence of photorespiration
• b) Calvin cycle
• c) EMP pathway
• d) TCA cycle

Answer: Absence of photorespiration

Question:

• a) 360 ppm
• b) 380 ppm
• c) 450 ppm
• d) 500 ppm

Answer: 360 ppm

Question: Linear relationship exists between incident light and rate of CO₂ fixation at/in

• a) More than one option is correct
• b) Low light intensity
• c) High light intensity
• d) Dense forests

Answer: More than one option is correct

Question: Choose the correct sequence of steps involved in C₄ cycle.

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a) D-Saturation point, E-Maximum photosynthesis
• b) D-10% of total sunlight, E-Compensation point
• c) A-Achieved at high light intensity
• d) A-Light saturation at 10% of total sunlight

Answer: D-Saturation point, E-Maximum photosynthesis

Question: The bulk fixation of carbon through photosynthesis, takes place in

• a) Ocean
• b) Tropical rain forests
• c) Crop plants
• d) None of these

Answer: Ocean

Question:

• a) Moll’s half leaf experiment
• b) Inverted funnel experiment
• c) Ganong screen
• d) KOH solution

Answer: Moll’s half leaf experiment

Question: choose the correct statement

• a) For biosynthesis of chlorophyll, raw materials required are succinyl Co-A and glycine
• b) Chlorophyll-a is soluble in petroleum ether and shows maximum absorption peak at 453 nm and 642 nm
• c) Chlorophyll-b is soluble in methyl alcohol and shows maximum absorption peak in 429 nm and 660 nm
• d)

  

Answer: For biosynthesis of chlorophyll, raw materials required are succinyl Co-A and glycine

Question: If a photosynthesising plant releases oxygen, containing more than normal amount of ¹⁸O, it is concluded that the plant has been supplied with

• a)

  

• b)

  

• c)

  

• d) Oxygen in the form of ozone

Answer:

Question: The first step in photosynthesis is

• a) Excitation of chlorophyll by light
• b) ATP synthesis
• c) Ionisation of water
• d) Production of assimilatory power

Answer: Excitation of chlorophyll by light

Question: Electric charge separation or quantum conversion occurs at

• a) Reaction centre
• b) Stroma
• c) Thylakoid membrane
• d) Antenna molecules

Answer: Reaction centre

Question: Minerals involved in photooxidation of water are

• a) Mn, Cl, Ca
• b) Mg, Fe, Mn
• c) Mn, Fe, Ca
• d) N, P, K

Answer: Mn, Cl, Ca

Question: Z-scheme in thylakoid membrane of plants is concerned with

• a) Electron transfer
• b) All of these
• c) Reduction of NAD⁺
• d) Reduction of CO₂

Answer: Electron transfer

Question: Absorption of radiant energy causes

• a) Oxidation of chlorophyll
• b) Reduction of chlorophyll
• c) Absorption of CO₂
• d) Absorption of CO₃

Answer: Oxidation of chlorophyll

Question: Cyclic photophosphorylation releases

• a) ATP only
• b) ATP, NADPH₂ and oxygen
• c) NADPH₂ only
• d) ATP and NADPH₂

Answer: ATP only

Question: In non-cyclic photophosphorylation

• a) NADP reductase activity requires H⁺ from stroma
• b) ATP is synthesised only
• c) Last electron donor is ferredoxin
• d) There is involvement of PS-I only

Answer: NADP reductase activity requires H⁺ from stroma

Question:

• a) a(ii), b(iii), c(iv), d(i)
• b) a(iii), b(i), c(ii), d(iv)
• c) a(ii), b(iii), c(i), d(iv)
• d) a(i), b(ii), c(iii), d(iv)

Answer: a(ii), b(iii), c(iv), d(i)

Question: Which is not true regarding cyclic electron transfer system (ETS) in thylakoid membrane of higher plants?

• a) External electron donor is required
• b) Only PS I is involved
• c) Operates at low light intensity
• d) Act as a back up for ATP synthesis

Answer: External electron donor is required

Question: ATP synthesis in chloroplast and mitochondria is due to proton gradient across the membrane. Select correct statement w.r.t. ATP formation in chloroplast

(a) Proton accumulates in lumen of thylakoid
(b) Splitting of water occurs on inner side of membrane
(c) Proton accumulates in stroma side of chloroplast
(d) NADP reductase is located on stroma side of membrane

• a) (a), (b) and (d) are correct
• b) Only (b) and (c) are correct
• c) Only (a) and (b) are correct
• d) Only (c) and (d) are correct

Answer: (a), (b) and (d) are correct

Question: C₃ cycle (reductive pentose phosphate cycle) is basically a

• a) CO₂ reduction cycle
• b) Photochemical reaction 
• c) CO₂ oxidising cycle
• d) None of these

Answer: CO₂ reduction cycle

Question:

• a) 3ATP, 2NADPH + H⁺
• b) 5ATP, 2NADPH + H⁺
• c) 2ATP, 3NADPH + H⁺
• d) 6.5 ATP, 2NADPH + H⁺

Answer: 3ATP, 2NADPH + H⁺

Question:

• a) RuBP, RUBISCO
• b) OAA, RUBISCO
• c) 3 PGA, RUBISCO
• d) PEP, PEPCO

Answer: RuBP, RUBISCO

Question: The methodology, which has been most useful for investigating the Calvin cycle, is

• a) Radioactive isotope technique
• b) Inverted funnel experiment
• c) Half leaf experiment
• d) Flash light experimental technique

Answer: Radioactive isotope technique

Question: Select the correct option for photosynthesis in C₃-plants

• a) First stable product of Calvin cycle undergoes phosphorylation in dark reaction
• b) Regeneration of each RUBP requires 6 ATP
• c) Bifunctional nature of PEPcase enzyme
• d) Optimum temperature is 30–40°C

Answer: First stable product of Calvin cycle undergoes phosphorylation in dark reaction

Question: In photorespiration, release of CO₂ occurs in

• a) Mitochondria
• b) Chloroplast
• c) Peroxisomes
• d) Glyoxisome

Answer: Mitochondria

Question: Photorespiration occurs

• a) All of these
• b) In co-operation with chloroplasts, peroxisomes and mitochondria
• c) In C₃ plants
• d) During day time

Answer: All of these

Question: During photorespiration, phosphorylation as well as oxidation both occurs in

• a) Chloroplast
• b) Mitochondria
• c) Peroxisome
• d) Centrosome

Answer: Chloroplast

Question: Sorghum and sugarcane plants show saturation at about

• a) 360 ppm of CO₂
• b) 50% of full sunlight
• c) 10% of full sunlight
• d) 500 ppm of CO₂

Answer: 360 ppm of CO₂

Question: CO₂ concentrating steps are found in

• a) C₄ plants
• b) CAM plants
• c) Temperate plants
• d) C₃ Plants

Answer: C₄ plants

Question: Kranz anatomy is concerned with

• a) Presence of distinct bundle sheath surrounded by concentric ring of mesophyll cells
• b) Having peripheral reticulum in chloroplast of bundle sheath
• c) Dimorphic chloroplast
• d) Large vacuole in mesophyll cells

Answer: Presence of distinct bundle sheath surrounded by concentric ring of mesophyll cells