NEET Biology Photosynthesis in Higher Plants MCQs Set 09

Multiple Choice Questions (MCQs) for NEET Biology: Photosynthesis In Higher Plants

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Multiple Choice Questions

Question 1: Plants like sugarcane show high productivity and high efficiency of CO2 fixation, because of
(a) Absence of photorespiration
(b) EMP pathway
(c) Calvin cycle
(d) TCA cycle
Show Answer & Explanation

Answer: (a) Absence of photorespiration

Explanation:
1. Photorespiration is a wasteful process decrease efficiency of C3 plants but absent in C4 plants.

Question 2: Choose the correct sequence of steps involved in C4 cycle.
(a) CO2 fixation  Regeneration  Transport
(b) CO2 fixation  Recarboxylation  Decarboxylation
(c) Transport  Regeneration  CO2 fixation
(d) CO2 fixation  Transport  Decarboxylation
Show Answer & Explanation

Answer: (d) CO2 fixation  Transport  Decarboxylation

Explanation:
1. CO2 fixation occurs first of all in mesophyll cell then transport into bundle sheath cell, where decarboxylation takes place.

Question 3: A wasteful process which involves oxidation of organic compounds in plants in presence of light is called
(a) Photorespiration
(b) PCR Cycle
(c) Hill’s reaction
(d) Bioluminiscence
Show Answer & Explanation

Answer: (a) Photorespiration

Explanation:
1. Photorespiration reduces the rate of photosynthesis.

Question 4: Which of the following would rarely be a limiting factor for photosynthesis?
(a) Chlorophyll
(b) Light
(c) Carbon dioxide
(d) Temperature
Show Answer & Explanation

Answer: (b) Light

Explanation:
1. Available from sunlight, required in least amount.

Question 5: The CO2 concentration at which C4 plants show saturation is about
(a) 360 ppm
(b) 380 ppm
(c) 450 ppm
(d) 500 ppm
Show Answer & Explanation

Answer: (a) 360 ppm

Explanation:
1. In C4 plants CO2 compensation point is 360 ppm.

Question 6: The bulk fixation of carbon through photosynthesis, takes place in
(a) Crop plants
(b) Tropical rain forests
(c) Ocean
(d) Both (1) & (2)
Show Answer & Explanation

Answer: (c) Ocean

Explanation:
1. Large number of phytoplankton present and occupied large area.

Question 7: If a photosynthesising plant releases oxygen, containing more than normal amount of 18O, it is concluded that the plant has been supplied with
(a) C6H12O6 containing 18O
(b) H2O containing 18O
(c) CO2 containing 18O
(d) Oxygen in the form of ozone
Show Answer & Explanation

Answer: (b) H2O containing 18O

Explanation:
1. O2 released is from H2O not from CO2.

Question 8: The first step in photosynthesis is
(a) Excitation of chlorophyll by light
(b) Ionisation of water
(c) ATP synthesis
(d) Production of assimilatory power
Show Answer & Explanation

Answer: (a) Excitation of chlorophyll by light

Explanation:
1. During light reaction the first step is excitation of chlorophyll molecules.

Question 9: Electric charge separation or quantum conversion occurs at
(a) Antenna molecules
(b) Thylakoid membrane
(c) Reaction centre
(d) Stroma
Show Answer & Explanation

Answer: (c) Reaction centre

Explanation:
1. It is involved in "Quantum conversion" where energy of light is converted to chemical energy possessed by emited electron.

Question 10: Minerals involved in photooxidation of water are
(a) Mn, Cl, Ca
(b) Mg, Fe, Mn
(c) Mn, Fe, Ca
(d) N, P, K
Show Answer & Explanation

Answer: (a) Mn, Cl, Ca

Explanation:
1. Oxygen evolving complex i.e., OEC.

Question 11: Z-scheme in thylakoid membrane of plants is concerned with
(a) Reduction of NAD+
(b) Reduction of CO2
(c) Electron transfer
(d) All of these
Show Answer & Explanation

Answer: (c) Electron transfer

Explanation:
1. Z-scheme is related with pathway of electron during non-cyclic photophosphorylation.

Question 12: Absorption of radiant energy causes
(a) Reduction of chlorophyll
(b) Oxidation of chlorophyll
(c) Absorption of CO2
(d) Oxidation of CO2
Show Answer & Explanation

Answer: (b) Oxidation of chlorophyll

Explanation:
1. Chlorophyll a which is present in LHC get oxidised.

Question 13: Cyclic photophosphorylation releases
(a) ATP and NADPH2
(b) ATP, NADPH2 and oxygen
(c) ATP only
(d) NADPH2 only
Show Answer & Explanation

Answer: (c) ATP only

Explanation:
1. Cyclic phosphorylation, cycled e– many times, and through ETS converts ADP to ATP.

Question 14: In non-cyclic photophosphorylation
(a) ATP is synthesised only
(b) Last electron donor is ferredoxin
(c) NADP reductase activity requires H+ from stroma
(d) There is involvement of PS-I only
Show Answer & Explanation

Answer: (c) NADP reductase activity requires H+ from stroma

Explanation:
1. NADP  H   NADPH.

Question 15: Which is not true regarding cyclic electron transfer system (ETS) in thylakoid membrane of higher plants?
(a) Operates at low light intensity
(b) Only PS I is involved
(c) Act as a back up for ATP synthesis
(d) External electron donor is required
Show Answer & Explanation

Answer: (d) External electron donor is required

Explanation:
1. No, PS II donates electron.

Question 16: ATP synthesis in chloroplast and mitochondria is due to proton gradient across the membrane. Select correct statement w.r.t. ATP formation in chloroplast<br />(a) Proton accumulates in lumen of thylakoid<br />(b) Splitting of water occurs on inner side of membrane<br />(c) Proton accumulates in stroma side of chloroplast<br />(d) NADP reductase is located on stroma side of membrane
(a) Only (a) and (b) are correct
(b) Only (b) and (c) are correct
(c) Only (c) and (d) are correct
(d) (a), (b) and (d) are correct
Show Answer & Explanation

Answer: (d) (a), (b) and (d) are correct

Explanation:
1. Proton accumulates in lumen of thylakoid.

Question 17: C3 cycle (reductive pentose phosphate cycle) is basically a
(a) CO2 reduction cycle
(b) CO2 oxidising cycle
(c) Photochemical reaction
(d) Both (2) & (3)
Show Answer & Explanation

Answer: (a) CO2 reduction cycle

Explanation:
1. It occurs during reduction of CO2 into glucose.

Question 18: To reduce 1 CO2 in C3 cycle, assimilatory power needed is
(a) 3ATP, 2NADPH + H+
(b) 2ATP, 3NADPH + H+
(c) 5ATP, 2NADPH + H+
(d) 6.5 ATP, 2NADPH + H+
Show Answer & Explanation

Answer: (a) 3ATP, 2NADPH + H+

Explanation:
1. 1 CO2 requires 3ATP, 2NADPH + H+.

Question 19: CO2 acceptor, and carboxylating enzyme in C3 plants are respectively
(a) PEP, PEPCO
(b) RuBP, RUBISCO
(c) OAA, RUBISCO
(d) 3 PGA, RUBISCO
Show Answer & Explanation

Answer: (b) RuBP, RUBISCO

Explanation:
1. RuBP is CO2 acceptor and enzyme is RUBISCO.

Question 20: 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
Show Answer & Explanation

Answer: (a) Radioactive isotope technique

Explanation:
1. 14 C. radioactive used in algal photosynthesis studies.

Question 21: CO2 concentrating steps are found in
(a) Rice
(b) Sugarcane
(c) Wheat
(d) Tomato
Show Answer & Explanation

Answer: (b) Sugarcane

Explanation:
1. This is so because due to dissociation of malic acid.

Question 22: In C4 plants, mesophyll cells and bundle sheath cells are specialised to perform respectively
(a) Light reaction and dark reaction
(b) Dark reaction and light reaction
(c) Light reaction and photorespiration
(d) Photorespiration and dark reaction
Show Answer & Explanation

Answer: (a) Light reaction and dark reaction

Explanation:
1. C4  Light reaction C3  Dark reaction.

Question 23: Agranal chloroplasts are found in
(a) Mesophyll of pea leaves
(b) Bundle sheath of mango leaves
(c) Mesophyll of maize leaves
(d) Bundle sheath of sugarcane leaves
Show Answer & Explanation

Answer: (d) Bundle sheath of sugarcane leaves

Explanation:
1. In Bundle sheath cells of C4 plants for e.g., sugarcane.

Question 24: Find odd one (w.r.t. double carboxylation)
(a) Zea mays
(b) Sugarcane
(c) Pisum sativum
(d) Sorghum
Show Answer & Explanation

Answer: (c) Pisum sativum

Explanation:
1. Pisum Sativum  C3 plant.

Question 25: Photosynthesis of maize plant differ from wheat plant in
(a) Number of ATP required per CO2 fixation
(b) Having spatial separation in both carboxylations
(c) Having PEPcase activity
(d) All of these
Show Answer & Explanation

Answer: (d) All of these

Explanation:
1. Maize is C4 plant.
2. Wheat is C3 plant.

Question 26: C4 plants are less efficient at low temperature due to
(a) Low O2 affinity of PEPcase
(b) Cold sensitivity of PEP synthetase enzyme
(c) Reduced rate of decarboxylation of organic acids
(d) High energy requirement for CO2 fixation
Show Answer & Explanation

Answer: (b) Cold sensitivity of PEP synthetase enzyme

Explanation:
1.  Optimum temp. is 30 – 40°C.

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Multiple Choice Questions (MCQs) for NEET Biology Photosynthesis In Higher Plants

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