Top 150+ Solved Photosynthesis MCQ Questions Answer
Q. 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.
a. If Assertion (A) and reason (R) both are correct and R is explanation to A.
b. If (A) and (R) both are correct but (R) is not an explanation to A.
c. If A is true but R is false.
d. If both A and R are false.
Q. A. Photosynthestically C4 plants are less efficient then C3 plants.R. The operaion of C4 pathway requires the involvement of only bundle-sheath cells.
a. If Assertion (A) and reason (R) both are correct and R is explanation to A.
b. If (A) and (R) both are correct but (R) is not an explanation to A.
c. If A is true but R is false.
d. If both A and R are false.
Q. One of the following is electron donor to P680 during light reactions of photosynthesis.
a. NADPH
b. Phytochrome
c. Chiorophyll
d. Water
Q. The requirement of assimilatory power to fix 6 molecules of CO2 is
a. 6 ATP, 6 NADPH
b. 12 ATP, 18 NADPH
c. 18 ATP, 18 NADPH
d. 18 ATP, 12 NADPH
Q. Photorespiration and photosynthesis both require
a. Organic fuel
b. chlorophyll
c. cytochromes
d. energy
Q. The chemical structure of chlorophyll ‘a’ varies from chlorophyll ‘b’ due to difference between.
a. CH3 and C2H5
b. CH3 and CH2 = CH2
c. CH3 and CHO
d. CHO and CH2 = CH2
Q. Choose the correct combinations of labelling the carbohydrate molecule involved in the Calvin cycle.
a. A – RuBP, B – Triose phosphate C– PGA
b. A – PGA, B – RuBP, C Triose phosphate
c. A – RuBP, B – Triose phosphate, C – PGAL
d. A – RuBP, B – PGAL, C – Triose phosphate
Q. Chlorophyll molecules absorb light energy of wavelength
a. 300-400 nm
b. 400-500 nm
c. 600-800 nm
d. 400-500 nm and 600-700 nm
Q. The reduction of ADP to ATP occurs by
a. oxidation of water
b. high conc. of H+ ions across the membrane
c. oxidation of NADPH
d. release of electron from PS-II to PS-I
Q. The process of ATP formation from ADP in the presence of light in chloroplast is called
a. phosphorylation
b. autophosphorylation
c. photophosphorylation
d. chemophosphorylation
Q. Photolysis of each water molecule in light reaction will yield
a. 2 electrons and 4 proton
b. 4 electrons and 4 protons
c. 4 electrons and 2 protons
d. 2 electrons and 2 protons
Q. The enzyme pair common to C3 plants and EMP is
a. cytochrome oxidase and enolase
b. aldolase and triose phosphate isomerase
c. aldolase and enolase
d. phosphoglyceromutase and triose phosphate isomerase
Q. Non-cycle photosphorylation is the main photochemical reaction in green plants because
a. it produces assimilatory power and oxygen
b. it initiates photolysis of water of productions of oxygen
c. it utilizes more energy for oxygen production.
d. there is no other cycle available.