Top 150+ Solved Photosynthesis MCQ Questions Answer
Q. Which one of the following is wrong in relation to photorespiration ? It
a. occurs in chloroplast
b. occurs in daytime only
c. is a characteristic of C4 plants
d. is a characteristic of C3 plants
Q. In sugarcane plant CO2 is fixed in malic acid, in which the enzyme that fixes CO2 is
a. ribulose biphosphate carboxylase
b. phosphoenol pyruvic acid carboxylase
c. ribolose phosphate kinase
d. fructose phosphatase
Q. Plants are removed from patients room at night because
a. they produce CO2 at night in more concentration
b. they produce CO2 all the time but release O2 also in day time
c. they consume O2 at night.
d. they do not photosynthesize at night, therefore fail to deplete CO2 of the room, hence their presence will increase CO2
Q. Who is that scientist who gave the Law of limiting factors ?
a. Blackman
b. Hill
c. Liebig
d. Von Mohi
Q. Which of the following is correct for chlorophyll of cyanobacteria ?
a. Chl a = C55H70O6N4 Mg
b. Chl a = C55H72O5N4 Mg
c. Chl b = C55H72O6N4 Mg
d. Xanthophyll = C40H56
Q. A. The atmospheric concentration of CO2 at which photosynthesis just compensation point.R. The CO2 compensation point is reached when the amount of CO2 uptake is less than that generated through respiration because the level of CO2 in the atmosphere is more than that required for achieving CO2 compensation point.
a. If A is correct and R is its explanation
b. If A is correct but R is not its explanation
c. If A is correct but R is wrong
d. If both A and R are correct
Q. Choose the correct statement.
a. The C4 plants do not have Rubisco.
b. Carboxylation of RuBP leads to the formation of PGA and phosphoglycolate.
c. Decarboxylation of C4 acids occurs in the mesophyll cells.
d. In CAM plants Calvin’s cycle reactions occur during night.
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) Law of limiting factorQ. Blackmann (ii) Dark reactionR. Daniel Arnon (iii) Photosynthetic phosphorylationS. Melvin Calvin (iv) Chemiosmotic hypothesist. Mass flow hyposhesis
a. P = (iv) Q = (i) R = (iii) S = (ii)
b. P = (i) Q = (iv) R = (ii) S = (iii)
c. P = (ii) Q = (i) R = (iii) S = (iv)
d. P = (iv) Q = (iii) R = (ii) S = (i)
Q. Match the following with correct combinationP. Carboxylation (i). Oxygen evolutionQ. Phosphorylation (ii) PhotorespirationR. Photolysis of water (iii) RubiscoS. Phosphoglycolate (iv) ChemosynthesisT. Nitrosomonas (v)ATP
a. P = (i) Q = (ii) R = (iii) S = (iv) T = (v)
b. P = (iii) Q = (v) R = (i) S = (ii) T = (iv)
c. P = (i) Q = (iii) R = (v) S = (iv) T = (i)
d. P = (i) Q = (iii) R = (iv) S = (ii) T = (v)
Q. During photosynthessis, plants
a. absorb O2, release CO2
b. release O2, absorb CO2
c. absorb N2, release O2
d. absorb N2 and release NH3
Q. A plant with low CO2 compensation point is
a. Atriplex patula
b. Leucopoa kingii
c. Gossypium hisrsutum
d. Tidestromia oblingifolia
Q. Rubisco is an enzyme for
a. CO2 fixation in dark reaction
b. photorespiration
c. regeneration of RuBP
d. photolysis of water
Q. Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because :
a. Four carbon acids are the primary initial CO2 fixation production.
b. The primary fixation of CO2 is mediated via PEP carboxalase.
c. Effective pumping of CO2 into bundlesheath cells.
d. Rubisco in C4 plants has higher affinity for CO2.
Q. Stomata of CAM plants
a. are always open
b. open during the day and close at right.
c. open during the night and close during the day.
d. never open