Name of the student :
1. The cyclic electron flow during photosynthesis in plants does not result into (a) production of NADPH, (b) Production of ATP (c) Production of protons (d) none
2. The species having the highest reduction potential is (a) [ Mn – complex ] +4 (b) P680·+ (c) NADPH (d) H2O
3. During plant photosynthesis concentration of protons increases in (a) stroma (b) lamelle (c) chloroplast (d) lumen
4. In photosynthesis by purple bacteria which step is the slowest ? (a) charge separation (b) electron transfer from QA to QB (c) electron transfer from Cyt bc1 to (Chl)2·+ (d) electron transfer from pheophytin to QA
5. In photosynthesis photons raise __________ of electrons (a) reduction potential (b) oxidation potential (c) flow (d) none
6. Oxidation potential of DCPIP is ______ than water (a) higher (b) lower (c) same (d) none
7. Which one is not oriented towards lumen side ? (a) OEC (b) PC (c) Cytf (d) Cyt b6
8. Which sequence of steps can give ATP ? ( A – addition of pH 4 medium , B – removal of the medium by centrifugation , C – addition of pH 8 medium, D – addition of ADP + Pi , E – incubation for 2 hours )
(a) Chloroplast – C – E - B – D – A , (b) Chloroplast - A - E – B – C – D (c) Chloroplast – C – E - B – A – D and (d) Chloroplast - A - B – E – C – D
9. ATP synthase is located in (a) granal lamelle (b) stromal lamelle (c) lumen (d) stroma
10. Which statement is not true about OEC ? (a) It catalyzes the evolution of oxygen (b) It is oriented towards stromal side (c) It provides 4 electrons to PSII (d) It acts as a proton pump.
11. Which species accepts electrons from water in OEC ? (a) Tyr (b) [ Mn – complex ] 0
(c) [ Mn – complex ] +4 (d) P680·+
12. How many NADPH molecules are produced for each molecule of oxygen evolved ?
(a) 1 (b) 2 (c) 3 (d) 4
13. How many molecules of ATP are produced for each oxygen molecule evolved in photosynthesis ?
(a) 1 (b) 2 (c) 3 (d) 4
14. Under which condition electron flow during plant photosynthesis can become cyclic ?
(a) high [NADP] / [NADPH] (b) low [NADP] / [NADPH] (c) In presence of DCMU (d) In presence of DCPIP
15. Which of the following is not involved in Calvin cycle ?
(a) Ribose-5-P (b) G-3-P (c) Ribulose-1-P (d) Erythrose-4-P
16. In 4 Calvin cycles the number of Ribulose-1,5-BP formed is
(a) 0 (b) 1 (c) 2 (d) all wrong
17. During sucrose biosynthesis the direction of Pi transport by Pi – TP antiporter is
(a) stroma to cytosol (b) lumen to stroma (c) cytosol to stroma (d) all
18. Which enzymatic step ( excluding transport ) in photorespiration utilizes THF as the cofactor ?
(a) 4th (b) 5th (c) 6th (d) 7th
19. Which enzyme involved in CO2 fixation in C4 plants is not regulated by light ?
(a) Malate dehydrogenase (b) Malic enzyme (c) PEP carboxylase (d) Pyr phosphate dikinase
20. The pathway of CO2 fixation in a C4 plants has ____ enzymatic steps
(a) 4 (b) 5 (c) 6 (d) 7
( The rubisco reaction has been counted )
21. Which enzyme catalyzes the liberation of CO2 in a C4 plant ?
(a) Malate dehydrogenase (b) Malic enzyme (c) PEP carboxylase (d) Pyr phosphate dikinase
22. In photorespiration fixation of 2 molecules of O2 gives _____ molecules of C3 .
(a) 1 (b) 2 (c) 3 (d) 4;
23. The most abundant protein in mitochondria of a spinach plant is
(a) PEP carboxylase (b) glycine decarboxylase (c) Rubisco (d) None
24. In photorespiration Calvin cycle is gradually slowed down because of decreasing supply of
(a) NADPH (b) ATP (c) RuBP (d) b + c
25. Regeneration of RuBP from TP in stage 3 of Calvin cycle is accomplished in ___ distinct steps.
(a) 7 (b) 8 (c) 9 (d) 10
26. Which statement is not true about the effect of photosynthesis?
(a) Mg++ concentration increases in stroma (b) Mg++ concentration decreases in stroma (c) H+ concentration decreases in stroma (d) All
27. Which of the followings is not different for C3 and C4 plants ?
(a) carbon intermediates (b) ATP consumed (c) specificity for O2 (d) Calvin cycle
28. For C4 plants which statement is more accurate ?
(a) CO2 fixation and Calvin cycle are spatially separated (b) CO2 capture and Calvin cycle are spatially separated ( CO2 is captured in mesophyll cells and fixed in Calvin cycle in bundle sheath.)
29.Which statement is false about cyclic photophosphorylation ?
(a) ATP is produced (b) NADPH is not produced (c) Oxygen is evolved (d) all
30. When chloroplast is illuminated with a light of 700 nm, which of the following gets reduced ?
(a) Plastoquinone (b) Plastocyanin (c) Ferrodoxin (d) Pheophytin
31. Which contains only cyclic photosynthesis ? (a) Plants (b) Purple bacteria (c) green sulfur bacteria (d) All wrong
32. The reaction catalyzed by Malic enzyme is analogous to the one catalyzed by __________ enzyme.
(a) isocitrate dehydrogenase (b) α – ketogluatarate ddehydogenase (c) succinate dehydrogenase (d) none [ Notice the structural similarity of the portion undergoing decarboxylation ]
33. Starch biosynthesis is stimulated by (a) high level of Pi and low level of triose phosphate
(b) low level of Pi and high level of triose phosphate (c) high level of Pi and high level of triose phosphate (d) low level of Pi and low level of triose phosphate .
34. What will happen upon addition of DCPIP to chloroplast treated with DCMU herbicide ?
(a) Synthesis of ATP will be restored. (b) Evolution of oxygen will resume (c) NADPH production will not be restored (d) All wrong
35. Iodoacetate can inhibit an enzyme by reacting with thiol group in its active site. Which enzyme is not inhibited by iodoacetate ? (a) Malate dehdrogenase (b) Ribulose – 5 – phosphate kinase
(c) Rubisco (d) PEP carboxylase
36. In the activation of ____________ enzyme thioredoxin is involved
(a) glycine decarboxylase (b) Malic enzyme (c) F - 1,6 - bisphosphatase (d) Rubisco
37. A defect in sedoheptulose-1,7- bisphosphatase will totally inhibit the synthesis of (a) ribulose-5- phosphate (b) ribose-5-phosphate (c) xylulose-5-phosphate ( d) Erythrose-4-phosphate
38. In photophosphorylation __________ donates electrons (a) NADPH (b) NADH (c) H2O (d) PSII.
39. Efficiency of photosynthesis would be maximum, when chloroplast is illuminated with light of _____ nm. (a) 680 nm (b) 700nm (c) a + b (d) all wrong
40. Which statement about photosynthesis is not true ? (a) Dark reaction does not occur in light (b) Dark reaction does not occur in dark (c) Dark reaction occurs in both light and dark (d) None
41. Decrease in wavelength of light in photosynthesis will favor (a) stacking of grana (b) unstacking of grana (c) a + b (d) all wrong
42. Which intermediate is not involved in the reaction catalyzed by rubisco ?
(a) endioate (b) 3-PG (c) β – hydroxyl acid (d) carbanion
43. Rubisco enzyme is activated by (a) RuBP (b) CO2 (c) a + b (d) all wrong
44. The main reason for photorespiration is (a) high temperature (b) high O2 levels (c) rubisco possesses oxygenase activity (d) None
45. A defective Malic enzyme can inhibit CO2 fixation in (a) C4 plants (b) C3 plants (c) a + b (d) None
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