Top 150+ Solved Photosynthesis MCQ Questions Answer
Q. 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.
a. light trapping device absent
b. pigments P-700 and P-680 not linked
c. CO2 assimilating enzymes absent
d. CO2 assimilation cannot occur in light
Q. Which of the following plant is efficient converter of solar energy whose net productivity 2-4 kg/m2/yr or even higher.
a. Wheat
b. rice
c. sugarcane
d. bajra
Q. The number of photons required to release one mole of O2 in photosynthesis called.
a. quantum yield
b. quantum requirement
c. red drop
d. Emerson’s effect
Q. Calvin cycle represents one of the following phenomenon.
a. oxidative carboxylation
b. dark phosphorylation
c. dark respiration
d. reductive carboxylation
Q. Hill reaction takes place
a. in the absence of CO2
b. in the presence of carbon dioxide
c. in the absence of a suitable electron acceptor
d. none above
Q. 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
a. P = (iv), Q = (iii), R = (ii), S = (i)
b. P = (iii), Q = (iv), R = (i), S = (i)
c. P = (iv), Q = (v), R = (iii), S= (ii)
d. P = (iv), Q = (iii), R = (i), S = (ii)
Q. Match Column – I with given under Column – II ; choose the answer which gives correct combination:Column – I(Scientists) Column – II(Contributions)P. A pigment which absorbs red and far-red light (i) CytochromeQ. Main pigment involved in transfer of electrons in (ii) PEP carboxylase photosynthesis isR. NADPH2 is generated through.... (iii) PhotochromeS. Enzyme which fixes CO2 in C4 plants (iv) Photosystems
a. P = (i), Q = (ii), R = (iii), S = (iv)
b. P = (iii), Q = (i), R = (iv), S = (iii)
c. P = (iii), Q = (ii), R = (iii), S= (i)
d. P = (i), Q = (ii), R = (iv), S = (iii)
Q. The basic feature of typical C4 plants showing ‘Kranz’ anatomy is
a. the presence of chloroplasts in mesophyll and epidermal cells
b. the presence of chloroplasts in bundle sheath cells
c. the presence of rudimentary chloroplasts in bundle sheath cells and typical chloroplasts with well-formed grana in mesophyll cells
d. the presence of typical chloroplasts with well-formed grana in bundle sheath cells and rudimentary chloroplasts in the mesophyll cells
Q. A. Six turns of Calvin-cycle result in the production of one molecule of glucose (C6H12O6) R. Three molecules of ribulose 1, 5 – bisphosphate (Ru BP) react with three molecules of carbon dioxide to produce six carbon intermediates.
a. A is correct and R is its explanation
b. A is correct but R is not its explanation
c. A is correct but R is wrong
d. Both A and R are wrong
Q. Maximum photosynthesis occurs in which of these lights ?
a. Red
b. Green
c. Very high light
d. Continuous bright light
Q. In C4 plants showing Kranz anatomy which of the following is correct ?
a. Bundle sheath cells without grana and mesophyll cells with grana
b. bundle sheath cells with grana mesophyll cells without grana
c. both are without grana
d. both are with grana
Q. In Blackmann’s ‘Law of Limiting Factors’ the rate of photosynthesis continues to increase with the successive increase in the amounts of
a. carbon dioxide, light, temperature
b. temperature, light, carbon dioxide
c. light, temperature, carbon dioxide
d. light, carbon dioxide, temperature
Q. Choose the correct statement
a. Chl a is blue green pigment with formula C55H70O6N4Mg
b. Chl a is blue green pigment with formula C55H72O5N4Mg
c. Chl b is yellow green pigment with formula C55H70O5N4Mg
d. Xanthophyll is pigment with formula C40H60
Q. Chlorophyll a is absent in which of the following photosynthesising organisms ?
a. Bacteria
b. Cyanobacteria
c. Red algae
d. Brown algae
Q. Photorespiration in C3 plants starts from.
a. phosphoglycerate
b. phosphosglycolate
c. glycerate
d. glycine