Photosynthesis Set 3

All India Pre Medical Test (AIPMT)

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This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Photosynthesis Set 3

Q1 | A. Under conditions of high light intensity and limited CO2 supply, photorespiration has a useful role in protecting the plants from photo-oxidative damage.R. If enough CO2 is not available to utilize light energy for carboxylation to proceed, the excess energy may not cause damage to plants.
  • If Assertion (A) and reason (R) both are correct and R is explanation to A.
  • If (A) and (R) both are correct but (R) is not an explanation to A.
  • If A is true but R is false.
  • If both A and R are false.
Answer: If both A and R are false.
Q2 | A. Photosynthestically C4 plants are less efficient then C3 plants.R. The operaion of C4 pathway requires the involvement of only bundle-sheath cells.
  • If Assertion (A) and reason (R) both are correct and R is explanation to A.
  • If (A) and (R) both are correct but (R) is not an explanation to A.
  • If A is true but R is false.
  • If both A and R are false.
Answer: If both A and R are false.
Q3 | One of the following is electron donor to P680 during light reactions of photosynthesis.
  • NADPH
  • Phytochrome
  • Chiorophyll
  • Water
Answer: Water
Q4 | The requirement of assimilatory power to fix 6 molecules of CO2 is
  • 6 ATP, 6 NADPH
  • 12 ATP, 18 NADPH
  • 18 ATP, 18 NADPH
  • 18 ATP, 12 NADPH
Answer: 18 ATP, 12 NADPH
Q5 | Photorespiration and photosynthesis both require
  • Organic fuel
  • chlorophyll
  • cytochromes
  • energy
Answer: cytochromes
Q6 | The chemical structure of chlorophyll ‘a’ varies from chlorophyll ‘b’ due to difference between.
  • CH3 and C2H5
  • CH3 and CH2 = CH2
  • CH3 and CHO
  • CHO and CH2 = CH2
Answer: CH3 and CHO
Q7 | Choose the correct combinations of labelling the carbohydrate molecule involved in the Calvin cycle.
  • A – RuBP, B – Triose phosphate C– PGA
  • A – PGA, B – RuBP, C Triose phosphate
  • A – RuBP, B – Triose phosphate, C – PGAL
  • A – RuBP, B – PGAL, C – Triose phosphate
Answer: A – RuBP, B – PGAL, C – Triose phosphate
Q8 | Chlorophyll molecules absorb light energy of wavelength
  • 300-400 nm
  • 400-500 nm
  • 600-800 nm
  • 400-500 nm and 600-700 nm
Answer: 300-400 nm
Q9 | The reduction of ADP to ATP occurs by
  • oxidation of water
  • high conc. of H+ ions across the membrane
  • oxidation of NADPH
  • release of electron from PS-II to PS-I
Answer: high conc. of H+ ions across the membrane
Q10 | The process of ATP formation from ADP in the presence of light in chloroplast is called
  • phosphorylation
  • autophosphorylation
  • photophosphorylation
  • chemophosphorylation
Answer: photophosphorylation
Q11 | Photolysis of each water molecule in light reaction will yield
  • 2 electrons and 4 proton
  • 4 electrons and 4 protons
  • 4 electrons and 2 protons
  • 2 electrons and 2 protons
Answer: 2 electrons and 2 protons
Q12 | The enzyme pair common to C3 plants and EMP is
  • cytochrome oxidase and enolase
  • aldolase and triose phosphate isomerase
  • aldolase and enolase
  • phosphoglyceromutase and triose phosphate isomerase
Answer: aldolase and triose phosphate isomerase
Q13 | Non-cycle photosphorylation is the main photochemical reaction in green plants because
  • it produces assimilatory power and oxygen
  • it initiates photolysis of water of productions of oxygen
  • it utilizes more energy for oxygen production.
  • there is no other cycle available.
Answer: it produces assimilatory power and oxygen
Q14 | ................... is the by product of photosynthesis.
  • O2
  • H2O
  • CO2
  • C6H12O6
Answer: O2
Q15 | Site of reduction of carbon is
  • lamellae
  • thylakoid
  • grana
  • stroma
Answer: stroma
Q16 | In C4 plants, the primary CO2 acceptor is
  • 3 - PGA
  • Oxalo acetic acid
  • RuBP
  • PEP
Answer: PEP
Q17 | It is estimated that about 85% of the earth’s photosynthetic activity is carried out by
  • tree
  • savannas
  • phytoplanktons
  • herbaceous plants
Answer: phytoplanktons
Q18 | In an experiment demonstrating the evolution of oxygen in Hydrilla, Sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable ?
  • Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate.
  • Amount of oxygen evolved increases as the avilability of carbon dioxide increases
  • Amount of oxygen evolved decreases as the avilability of carbon dioxide increases
  • Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate
Answer: Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate
Q19 | In C4 plants, the bundle sheath cells.
  • have thin walls to facilitate gaseous exchange
  • have large intercellular spaces
  • are rich in PEP carboxylase
  • have a high density of chloroplasts
Answer: have a high density of chloroplasts
Q20 | In chlorophyll structure four pyrole rings are united with Mg by their atoms of
  • N
  • C
  • H
  • O
Answer: N
Q21 | The fixation and reduction of CO2 occur in preence of
  • ATP
  • ATP and NADPH
  • NADPH, chlorophyll and water
  • ATP, NADPH and light
Answer: ATP and NADPH
Q22 | Sugar moves in phloem vessels as ______.
  • cellulose
  • glucose
  • starch
  • sucrose
Answer: sucrose
Q23 | ____ ions help in photolysis of water.
  • Mn++
  • Mg++
  • Cl-
  • both (a) and (c)
Answer: both (a) and (c)
Q24 | RUBISCO enzyme is also called as ______.
  • carboxy tetra mutase
  • carboxy di mutase
  • carboxy tri mutase
  • carboxy uni mutase
Answer: carboxy di mutase
Q25 | ______ is precursor for abscissic acid (ABA)
  • Zeatin
  • Lutein
  • Violaxanthin
  • Mevalonic acid
Answer: Violaxanthin
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