Top 150+ Solved Photosynthesis MCQ Questions Answer
Q. Cyclic photophosphorylation is confined to
a. Photosystem I
b. Photosystem II
c. both a & b
d. none above
Q. For synthesis of one gram of hexose, the land plant consumes.
a. Only 1/3 of the CO2 of air
b. Only 1/4 of the CO2 of air
c. Only 2/3 of the CO2 of air
d. none of the above
Q. For synthesis of one glucose molecule, the number of ATP required are
a. 9 ATP for C3 cycle and 20 ATP for C4 cycle
b. 18 ATP for C3 cycle and 30 ATP for C4 cycle
c. 22 ATP for C3 cycle and 35 ATP for C4 cycle
d. 24 ATP for C3 cycle and 36 ATP for C4 cycle
Q. The volume of O2 librated in photosynthesis has the following ratio to CO2.
a. O2/CO2 = 1
b. O2/CO2 = 1/2
c. O2/CO2 = 2/1
d. O2/CO2 = 3/1
Q. The inhibiting effect of oxygen in C3 plants on photosynthesis is
a. solarization
b. photooxidation
c. Warbug’s effect
d. none above
Q. It is advantageous to use a water plant to demonstrate photosynthesis other than a land plant because.
a. it photosynthesize rapidly
b. it respires slowly
c. it does not transpire
d. O2 bubbles from cut and can be collected over H2O.
Q. For chlorophyll formation most important are
a. Fe++ and Ca++
b. Fe++ and Mg++
c. Mg++ and Ca++
d. all the above
Q. Translocation of sugar in angiosperms occur in form of
a. glucose
b. starch
c. lactose
d. sucrose
Q. Q10 is
a. respiratory coefficient
b. photosynthetic coefficient
c. photosynthetic yield
d. temperature coeffiecient
Q. Photorespiration is favoured by
a. low temperature
b. low light intensity
c. high O2 and low CO2
d. low O2 and high CO2
Q. Quinones are
a. mobile electron carrier
b. enzymes of oxidative phosphorylation
c. enzymes of krebs cycle
d. none of the above
Q. During dark reaction, for the fixation of carbon, the three carbon atoms of each molecule of 3 –phosphogylceric acid (PGA) are derived from
a. RuBP only
b. CO2 only
c. RuBP + CO2
d. RuBP + CO2 + PEP.
Q. Calvin cycle utilize for fixation of 3 molecules of CO2
a. 9 ATP and 6 NADPH2
b. 8 ATP and 8 NADPH2
c. 9 ATP and 3 NADPH2
d. 6 ATP and 6 NADPH2
Q. Chloroplast has maximum quantity of....in stroma
a. dehydrogenase
b. RuBP carboxylase
c. pyruvic carboxylase
d. hexokinase