PHOTOSYNTHESIS DARK PHASE ASSIGNMENT

1	Arrange the involvement of the following cell organelles in a sequence during Photorespiration I. Chloroplast II. Mitochondrion III. Peroxisome IV. Chloroplast V. Peroxisome II, I, III, IV, V III, I, V, II, IV I, III, II, V, IV IV, III, I, V, II Ans:I, III, II, V, IV
2	Photorespiration is also known as C2 Cycle C5 Cycle C3 Cycle C4 Cycle Ans:C2 Cycle
3	During Photorespiration, O2 is utilized by I. Mitochondrion II. Chloroplast III. Peroxisome I and II II and III III and I I, II, III Ans:II and III
4	For complete loss of Carbons of one molecule of Glucose through Photorespiration, the number of oxygen atoms utilized is 6 18 48 24 Ans:48
5	Photorespiration causes the loss of Assimilated sulphur Assimilated Nitrogen Assimilated to NADH Assimilated NADPH Ans:Assimilated Nitrogen
6	If both Photosynthetic Carbon Reduction and Photosynthetic Carbon Oxidation Cycles are operated simultaneously in a green cell of C3 plant, the number of ATP required for the formation one hexose, at the cost of RuBP is 30 26 18 22 Ans:22
7	The following enzyme does not show absolute specificity for the Substrate during Photorespiration. Glycolate oxidase Rubisco Glycine decarboxylase Aminotransferase Ans:Rubisco
8	Match the following with respect to Phororespiration A - III, B - I, C - V, D - II A - V, B - I, C - IV, D - II A - III, B - II, C - IV, D - V A - III, B - I, C - IV, D - II Ans:A - III, B - I, C - IV, D - II
9	[A]: Photorespiration is known to protect the C3 plants from photo-oxidative damage. [R]: It prevents the destruction of Chlorophyll by excessively formed oxygen in Photosynthesis Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:Both A and R are true and R is the correct explanation of A
10	At normal air levels of CO2 and O2, the ratio between CO2 fixation to Photorespiration is 2 : 1 5 : 4 4 : 1 1 : 4 Ans:4 : 1
11	Choose the correct statement with respect to Photorespiration No net usage of NADH2 No net usage of ATP No net liberation of CO2 No net usage of O2 Ans:No net usage of NADH2
12	During Photorespiration, the 2nd class of enzymes of IUB are involved in the formation of I. Glycine II. Serine III. Hydroxypyruvic acid IV. Phosphoglyceric acid I, IV II, III, IV All except II I, II, IV Ans:All except II
13	During photorespiration, Ammonia is liberated from Serine Glycine Glyoxylic acid Glycolic acid Ans:Glycine
14	Law of minimum was proposed by Blackman Warburg Embden Liebig Ans:Liebig
15	The most common natural limiting factors of photosynthesis are I. Oxygen II. Carbondioxide III. Light IV. Temperature I and II II and III II, III, IV I, II, III Ans:II and III
16	Choose the correct statement At very high CO2 concentrations, with increase in light intensity, the photosynthetic rate increases. At high O2 concentrations, the photosynthetic rate is unaltered At high light intensity, with increase in CO2, the photosynthetic rate increases only upto certain extent. Low O2concentration limits photosynthesis Ans:At high light intensity, with increase in CO2, the photosynthetic rate increases only upto certain extent.
17	In Photorespiration, NH3 is liberated during the formation of Glycolic acid Glyceric acid Glycine Serine Ans:Serine
18	The following intermediate of Photorespiration is subjected to decarboxylation Serine Glycolic acid Glycine Glyoxylic acid Ans:Glycine
19	The total number of reactions that occur in Peroxisomes during C2 cycle is 3 4 5 2 Ans:4
20	Match the following with respect to Photorespiration A - IV, B - III, C - V, D - II A - IV, B - III, C - II, D - I A - III, B - V, C - IV, D - II A - IV, B - III, C - I, D - II Ans:A - IV, B - III, C - V, D - II
21	The most abundantly present enzyme on this planet has acitive sites for I. PEP II. RuBP III. CO2 IV. O2 All except I All except IV II and III I and III Ans:All except I
22	The fixed CO2 is transported into to the Cytosol from chloroplast stroma in the form of Hexoses Sucrose Starch Trioses Ans:Trioses
23	The techniques used by Calvin and his associates to discover the path of Carbon in Photosynthesis were I. Autoradiography II. X-ray crystallography III. Gel electrophoresis IV. Paper chromatography I, IV II, III I, II III, IV Ans:I, IV
24	Arrange the formation of the following in correct sequence during Calvin cycle I. Xylulose-5-Phosphate II. Erythrose-4-Phosphate III. Ribose-5-Phosphate IV. Sedoheptulose-7-Phosphate I, II, IV, III II, I, IV, III II, I, III, IV I, II, III, IV Ans:II, I, IV, III
25	Total number of reactions in calvin cyle is 10 12 13 15 Ans:13
26	The conditions for more rates of Calvin cycle than Sucrose formation in Cytosol are I. More availability of CO2 II. More availability of ATP and NADPH2 III. More availability of O2 IV. Less atmospheric temperatures I and II III and IV II and IV I and III Ans:I and II
27	This is not the substrate for transketolase reaction of Calvin cycle Sedoheptulose-7-phosphate Fructose-6-phosphate Dihydroxyacetone phosphate Glyceraldehyde-3-Phosphate Ans:Dihydroxyacetone phosphate
28	Match the following with respect to Calvin cycle A - IV, B - V, C - II, D - I A - III, B - IV, C - I, D - II A - III, B - V, C - I, D - II A - V, B - IV, C - II, D - III Ans:A - III, B - IV, C - I, D - II
29	Study the following table and choose the correct combination with respect to Calvin cycle I and II III and IV II and III I and IV Ans:II and III
30	[A]: Reduction reaction of Calvin cycle is dephosphorylation reaction [R]: The product of the reaction is a triose Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:Both A and R are true but R is not the correct explanation of A
31	The ratio between the number of trioses transported from chrloroplst to cytosol and number of RuBP regenerated during Reductive Pentose Phosphate pathway is 1:3 2:5 1:2 2:3 Ans:1:3
32	Activity of this enzyme removes phosphate from the substrate as inorganic phosphate. Malic enzyme PEP carboxylase RuBP carboxylase Aldolase Ans:PEP carboxylase
33	Hatch and Slack discovered a pathway of photosynthesis in the plant Maize Chlorella Sugarcane Sorghum Ans:Sugarcane
34	If 4 H+ must be transported to for the generation of one ATP in CF particle, the number of photons involved in photosynthetic electron transport of Sugarcane to form a molecule must be 48 72 57 60 Ans:72
35	This event of photosynthesis need not always be associated with thylakoid. Formation of NADPH2 Release of O2 Formation of ATP Formation of PQH2 Ans:Formation of NADPH2
36	Arrange the following applied by Calvin in correct sequence to elucidate C3 cycle I. Methanol II. X-rays III. C14O2 IV. Paper chromatography III, I, II, IV III, IV, II, I III, I, IV, II I, III, IV, II Ans:III, I, IV, II
37	Main end products of C3 cycle are Trioses, hexoses Starch, Sucrose Glucose, Starch Glucose, Fructose Ans:Starch, Sucrose
38	Match the following with respect to Photosynthesis A - IV, B - III, C - II, D - I A - V, B - III, C - IV, D - II A - IV, B - V, C - II, D - I A - III, B - IV, C - I, D - V Ans:A - IV, B - III, C - II, D - I
39	Study the following table with respect to C4 cycle and choose the correct combination All except IV I and II III and IV II, III, IV Ans:All except IV
40	[A]: All reactions of C4 cycle take place in Chloroplast [R]: The reactions that occur in mesophyll cell chloroplast do not occur bundle sheath cell chloroplast Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:A is false but R is true