2017_Photosynthesis_Respiration_MCQ_QP+MS

2017 Respiration and Photosynthesis MCQ2017 / H2 / ACJC PRELIM / P1 Q201Which of the following statements explains the mechanism for chemiosmosis in the synthesis of ATP?AThe energy released by the reduction and subsequent oxidation of components of the electron transport chain is transferred to ATP synthase for the synthesis of ATP.BPhosphorylation of ADP is linked to the proton gradient established by the electron transport chain.CThe difference in pH between the intermembrane space and the cytosol drives the formation of ATP.DThe flow of H+ through ATP synthase into the intermembrane space drives the synthesis of ATP.2017 / H2 / ACJC PRELIM / P1 Q212The diagram below shows the rate of photosynthesis of four different plants at different concentrations of carbon dioxide.200530Rate of CO2 uptake / cm3m-2h-1 CO2 Concentration / µl l-1 Which of the following conclusions can be made?1At CO2 concentrations below 150 µl l-1, CO2 concentration is the main limiting factor for all the plants.2CO2 compensation point is around 40 µl l-1 for sunflower and red clover, and it measures the light intensity when the rate of CO2 uptake equals to the rate of CO2 given off.3Rate of CO2 uptake was zero for maize at CO2 concentration of 0 µl l-1 as the amount of CO2 released from respiration is used for photosynthesis.

4Of the four plants, maple has the lowest amount of organic compound produced at CO2 concentration of 200 µl l-1.A1, 2 and 3 onlyB1, 3 and 4 onlyC1 and 2 onlyD3 and 4 only2017 / H2 / ACJC PRELIM / P1 Q223Dinitrophenol is a metabolic poison that can lodge within the thylakoid membranes of chloroplasts. It then provides an alternative route for H+ ions to diffuse across the thylakoid membranes. In what way will the Calvin cycle be affected in chloroplasts poisoned by dinitrophenol?ANo change in rate as Calvin cycle occurs in the stroma and not at thylakoid membranes.BThe rate of Calvin cycle will increase as pH in the stroma will decrease towards the optimum for enzymes involved in the cycle.CThe rate of Calvin cycle will decrease with the accumulation of glycerate-3-phosphate.DThe rate of Calvin cycle will decrease with the accumulation of glyceraldehyde-3-phosphate.2017 / H2 / AJC PRELIM / P1 Q184Which of the following is true about both cyclic and non-cyclic photophosphorylation?1Establishes an electrochemical gradient across the thylakoid membrane 2Involve photosystem II3Require oxygen as the final electron acceptor 4Photolysis of water occurs A1 onlyB1 and 2 onlyC2 and 4 onlyD1, 3 and 4 only

2017 / H2 / AJC PRELIM / P1 Q195The experimental setup below was created by homogenizing leaf cells to break their cell walls. The leaf suspensions containing the cytoplasm and organelles were then placed in test-tubes containing non-labeled water (H216O) and 18O-labeled water (H218O) respectively. A few drops of DCPIP, a hydrogen acceptor, were added to each test-tube. DCPIP will turn from blue to colourless when it is reduced and this colourless DCPIP can