Photosynthesis Set 1

All India Pre Medical Test (AIPMT)

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This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Photosynthesis Set 1

Q1 | Intensity of light increase 20 times, rate of photosynthesis will
  • increase
  • not increase
  • decrease
  • increase till feed back inhibition.
Answer: increase till feed back inhibition.
Q2 | Out of the total light energy that is available for plants is
  • 50%
  • 75%
  • 25%
  • 1––2%
Answer: 50%
Q3 | One photon is blue light contains....kcal and of red light....kcal
  • 70 ; 40
  • 220 ; 70
  • 10 ; 90
  • 90 ; 10
Answer: 90 ; 10
Q4 | The most efficient convertor of sunlight is
  • Potato
  • Tomato
  • Sugar cane
  • Papaya
Answer: Sugar cane
Q5 | Cyclic photophosphorylation is confined to
  • Photosystem I
  • Photosystem II
  • both a & b
  • none above
Answer: Photosystem I
Q6 | For synthesis of one gram of hexose, the land plant consumes.
  • Only 1/3 of the CO2 of air
  • Only 1/4 of the CO2 of air
  • Only 2/3 of the CO2 of air
  • none of the above
Answer: Only 1/4 of the CO2 of air
Q7 | For synthesis of one glucose molecule, the number of ATP required are
  • 9 ATP for C3 cycle and 20 ATP for C4 cycle
  • 18 ATP for C3 cycle and 30 ATP for C4 cycle
  • 22 ATP for C3 cycle and 35 ATP for C4 cycle
  • 24 ATP for C3 cycle and 36 ATP for C4 cycle
Answer: 18 ATP for C3 cycle and 30 ATP for C4 cycle
Q8 | The volume of O2 librated in photosynthesis has the following ratio to CO2.
  • O2/CO2 = 1
  • O2/CO2 = 1/2
  • O2/CO2 = 2/1
  • O2/CO2 = 3/1
Answer: O2/CO2 = 1
Q9 | The inhibiting effect of oxygen in C3 plants on photosynthesis is
  • solarization
  • photooxidation
  • Warbug’s effect
  • none above
Answer: Warbug’s effect
Q10 | Pick up C4 plant.
  • Papaya
  • Potato
  • Maize
  • Pea
Answer: Maize
Q11 | It is advantageous to use a water plant to demonstrate photosynthesis other than a land plant because.
  • it photosynthesize rapidly
  • it respires slowly
  • it does not transpire
  • O2 bubbles from cut and can be collected over H2O.
Answer: O2 bubbles from cut and can be collected over H2O.
Q12 | For chlorophyll formation most important are
  • Fe++ and Ca++
  • Fe++ and Mg++
  • Mg++ and Ca++
  • all the above
Answer: Fe++ and Mg++
Q13 | Translocation of sugar in angiosperms occur in form of
  • glucose
  • starch
  • lactose
  • sucrose
Answer: sucrose
Q14 | Q10 is
  • respiratory coefficient
  • photosynthetic coefficient
  • photosynthetic yield
  • temperature coeffiecient
Answer: temperature coeffiecient
Q15 | Photorespiration is favoured by
  • low temperature
  • low light intensity
  • high O2 and low CO2
  • low O2 and high CO2
Answer: high O2 and low CO2
Q16 | Quinones are
  • mobile electron carrier
  • enzymes of oxidative phosphorylation
  • enzymes of krebs cycle
  • none of the above
Answer: mobile electron carrier
Q17 | During dark reaction, for the fixation of carbon, the three carbon atoms of each molecule of 3 –phosphogylceric acid (PGA) are derived from
  • RuBP only
  • CO2 only
  • RuBP + CO2
  • RuBP + CO2 + PEP.
Answer: RuBP + CO2
Q18 | Calvin cycle utilize for fixation of 3 molecules of CO2
  • 9 ATP and 6 NADPH2
  • 8 ATP and 8 NADPH2
  • 9 ATP and 3 NADPH2
  • 6 ATP and 6 NADPH2
Answer: 9 ATP and 6 NADPH2
Q19 | Chloroplast has maximum quantity of....in stroma
  • dehydrogenase
  • RuBP carboxylase
  • pyruvic carboxylase
  • hexokinase
Answer: RuBP carboxylase
Q20 | If thylakoids are removed and kept in culture medium having CO2 and H2O and exposed to light ; they cannot form hexose sugars as end product because.
  • light trapping device absent
  • pigments P-700 and P-680 not linked
  • CO2 assimilating enzymes absent
  • CO2 assimilation cannot occur in light
Answer: CO2 assimilating enzymes absent
Q21 | Which of the following plant is efficient converter of solar energy whose net productivity 2-4 kg/m2/yr or even higher.
  • Wheat
  • rice
  • sugarcane
  • bajra
Answer: sugarcane
Q22 | The number of photons required to release one mole of O2 in photosynthesis called.
  • quantum yield
  • quantum requirement
  • red drop
  • Emerson’s effect
Answer: quantum requirement
Q23 | Calvin cycle represents one of the following phenomenon.
  • oxidative carboxylation
  • dark phosphorylation
  • dark respiration
  • reductive carboxylation
Answer: reductive carboxylation
Q24 | Hill reaction takes place
  • in the absence of CO2
  • in the presence of carbon dioxide
  • in the absence of a suitable electron acceptor
  • none above
Answer: none above
Q25 | Match the names of scientists given under Column – I with their important contributions given underColumn – II ; choose the answer which gives correct combination of the alphabets :Column – I(Scientists) Column – II(Contributions)P. Peter Mitchell (i) Steps of dark reaction of photosynthesis.Q. J.W. Gibbas (ii) Photosynthetic phosphorylationR. Danial Arnon (iii) Concept of free energyS. Melvin Calvin (iv) Chemiosmotic hypothesis(v) Mass flow hypothesis
  • P = (iv), Q = (iii), R = (ii), S = (i)
  • P = (iii), Q = (iv), R = (i), S = (i)
  • P = (iv), Q = (v), R = (iii), S= (ii)
  • P = (iv), Q = (iii), R = (i), S = (ii)
Answer: P = (iv), Q = (iii), R = (ii), S = (i)
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