1. What is the source of the oxygen released into the air as a product of photosynthesis? D. Both water and carbon dioxide (Total 1 mark)
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1 2.9 Photosynthesis Paper 1 Possible Mult Choice Questions 1. What is the source of the oxygen released into the air as a product of photosynthesis? A. Chlorophyll B. Carbon dioxide only C. Water only D. Both water and carbon dioxide 2. Which type of light is least useful for photosynthesis in terrestrial plants? A. Blue B. Green C. White D. Red 3. Which variable has the least effect on enzyme activity? A. Temperature B. Light intensity C. ph D. Substrate concentration IB Questionbank Biology 1
2 4. The diagram below summarizes the light-dependent reactions in photosynthesis. What is occurring at X? X Electrons Electrons Photosystem I Light Photosystem II Light A. ADP + phosphate ATP B. NADP + NADPH + H + C. H 2 O O 2 + 2H + D. NADPH + H + NADP + 5. What is the first identifiable product of carbon dioxide fixation in photosynthesis? A. Ribulose bisphosphate (RuBP) B. Glycerate3-phosphate (GP) C. Triose phosphate (TP) D. Acetyl CoA IB Questionbank Biology 2
3 6. Which of the following terms correctly describe the molecule below? H H C OH H C O H C H OH H C OH C C OH H OH I. Monosaccharide II. III. Ribose Carbohydrate A. I only B. I and III only C. II and III only D. I, II and III 7. Which two colours of light does chlorophyll absorb most? A. Red and yellow B. Green and blue C. Red and green D. Red and blue IB Questionbank Biology 3
4 8. Where in the cell does the Calvin cycle take place? A. Stroma of chloroplast B. Mitochondrial matrix C. Cytoplasm D. Inside thylakoid 9. What reaction, involving glycerate 3-phosphate, is part of the light-independent reactions of photosynthesis? A. Glycerate 3-phosphate is carboxylated using carbon dioxide. B. Two glycerate 3-phosphates are linked together to form one hexose phosphate. C. Glycerate 3-phosphate is reduced to triose phosphate. D. Five glycerate 3-phosphates are converted to three ribulose 5-phosphates. 10. What is the advantage of having a small volume inside the thylakoids of the chloroplast? A. High proton concentrations are rapidly developed. B. High electron concentrations are rapidly developed. C. Photosynthetic pigments are highly concentrated. D. Enzymes of the Calvin cycle are highly concentrated. IB Questionbank Biology 4
5 11. What conclusion can be drawn from examining the action spectrum for a green plant shown below? A. Yellow light is the most effective at promoting photosynthesis. B. Every colour of light is equally effective at promoting photosynthesis. C. Light of wavelength 550 nm is least effective at promoting photosynthesis. D. Light in the green range is the most effective at promoting photosynthesis. 12. Which of the following colours of light is absorbed the most by chlorophyll? A. Blue B. Green C. Yellow D. Orange IB Questionbank Biology 5
6 13. Which of the following graphs represents the effect of changing light intensity on the rate of oxygen production by a green plant? IB Questionbank Biology 6
7 14. What is light energy used for during photosynthesis? A. To produce carbon dioxide B. To produce water molecules C. To produce ATP D. To break down sugar molecules 15. Where are complex carbohydrates made in the chloroplast? A. In the intermembrane space B. In the stroma C. On the inner membrane D. In the thylakoid space 16. Which two tissues of a leaf are photosynthetic? A. Upper epidermis and palisade mesophyll B. Palisade mesophyll and spongy mesophyll C. Spongy mesophyll and xylem D. Upper epidermis and xylem IB Questionbank Biology 7
8 17. Where is chlorophyll found in a plant cell? A. Thylakoid membranes B. Stroma C. Matrix D. Cristae 18. What happens in the light-independent reactions of photosynthesis? A. Splitting of water molecules B. ATP synthesis C. Reduction of NADP D. Reduction of CO Which graph best represents the effect of temperature on the rate of photosynthesis of a plant? IB Questionbank Biology 8
9 20. What is produced by the light-dependent reactions of photosynthesis and used in the Calvin cycle? A. Hydrogen and oxygen B. ATP and NADPH C. NADPH and oxygen D. ATP and CO The photosynthetic activity of desert plants is often reduced in the middle of the day. What is the most reasonable explanation for this fact? A. Enzymes are denatured by the high temperatures. B. There is not sufficient water for photosystem I. C. Most of the light is reflected by the thick cuticle. D. The stomata close to preserve water and gas exchange decreases. 22. How can the rate of photosynthesis of a plant be directly measured? A. By measuring the rate of oxygen produced B. By measuring the rate of carbon dioxide produced C. By measuring the rate of plant growth D. By measuring the rate of light absorbed 23. A plant is exposed to increasing light intensity from very dim to bright light, while the carbon dioxide concentration and temperature are kept at an optimum level. What will happen to the rate of oxygen production? A. It will increase exponentially. B. It will remain constant. C. It will decrease to a minimum level. D. It will increase to a maximum level. IB Questionbank Biology 9
10 24. The diagram below shows the structure of a chloroplast. What is the structure labelled X? A. Ribosome B. Stroma C. Inner membrane D. Thylakoid 25. Where are the light-dependent and light-independent reactions taking place in the diagram below? Light-dependent Light-independent A. I IV B. II III C. III II D. IV I IB Questionbank Biology 10
11 26. What is needed in photosynthesis to convert carbon dioxide into organic molecules? A. Light and hydrogen from the splitting of water B. Light and oxygen from the splitting of water C. ATP and hydrogen from the splitting of water D. ATP and oxygen from the splitting of water 27. Which combination measures the rate of photosynthesis? Direct measurement Indirect measurement A. Oxygen production Biomass increase B. Carbon dioxide uptake Biomass decrease C. Oxygen uptake Biomass increase D. Carbon dioxide production Biomass decrease 28. What is the first identifiable product of carbon dioxide fixation in photosynthesis? A. Ribulose bisphosphate (RuBP) B. Glycerate3-phosphate (GP) C. Triose phosphate (TP) D. Acetyl CoA IB Questionbank Biology 11
12 29. What colours of light give the two peaks on the graph of the action spectrum of photosynthesis shown below? % absorption wavelength of light A. Red and infrared B. Green and red C. Blue and green D. Blue and red 30. What substance is moved into the thylakoids of the chloroplast using energy derived from light? A. Carbon dioxide (CO 2 ) B. Protons (H + ) C. Glycerate 3-phosphate (GP) D. Adenosine triphosphate (ATP) IB Questionbank Biology 12
13 31. Which limiting factor of photosynthesis is shown below? Rate of photosynthesis A. Increasing carbon dioxide concentration B. Increasing temperature C. Increasing light intensity D. Increasing humidity 32. How is the proton gradient generated in chloroplasts during photosynthesis? A. Flow of electrons from carrier to carrier in the thylakoid membrane causes pumping of protons across the thylakoid membrane. B. Light causes protons to flow through protein channels in the thylakoid membrane. C. Light splits water molecules in the stroma, causing the release of protons. D. Protons are pumped across the thylakoid membrane using energy from ATP. IB Questionbank Biology 13
14 33. The diagram below shows the light independent stage of photosynthesis (the Calvin Cycle). Glucose I Ribulose bisphosphate (RuBP) CO 2 Triose Phosphate (TP) II Glycerate 3 Phosphate (GP) III Where is energy, from ATP generated during the light dependent stage, used in this cycle? A. I and II only B. I and III only C. II and III only D. I, II and III 34. Why do leaves of plants look green? A. Most of the green light is absorbed by chlorophyll and most of the red and blue light is reflected. B. Most of the blue light is absorbed by chlorophyll and most of the red and green light is reflected. C. Most of the red light is absorbed by chlorophyll and most of the green and blue light is reflected. D. Most of the red and blue light is absorbed by chlorophyll and most of the green light is reflected. IB Questionbank Biology 14
15 35. What chemical substances are used during the manufacture of organic molecules in photosynthesis? I. Hydrogen II. III. ATP Carbon dioxide A. I and III only B. I and II only C. II and III only D. I, II and III 36. In the graph below which line shows an action spectrum of photosynthesis? A B C D Relative rate of photosynthesis Wavelength / nm IB Questionbank Biology 15
16 37. Which diagram represents the action spectrum of photosynthesis? A. 100 B. 100 Relative rate of photosynthesis Relative rate of photosynthesis Wavelength Wavelength C. 100 D. 100 Relative rate of photosynthesis Relative rate of photosynthesis Wavelength Wavelength 38. Why is the action spectrum for photosynthesis similar to the absorption spectra of photosynthetic pigments? A. Photosynthetic pigments have the same optimum temperature as the enzymes used in photosynthesis. B. Plants absorb the same photosynthetic pigments for use in photosynthesis. C. Only wavelengths of light absorbed by pigments can be used in photosynthesis. D. The amount of energy absorbed by photosynthetic pigments is equal to the activation energy for photosynthesis. IB Questionbank Biology 16
17 39. Which graph shows the effect of increasing carbon dioxide concentration (CO 2 ) on the rate of photosynthesis? A. B. C. IB Questionbank Biology 17
18 D. 40. Pigments are extracted from the leaves of a green plant. White light is then passed through the solution of pigments. What effect do the leaf pigments have on the white light? A. Green wavelengths are absorbed and red and blue wavelengths are transmitted. B. Red and blue wavelengths are absorbed and green wavelengths are transmitted. C Blue wavelengths are absorbed and green and red wavelengths are transmitted. D. Green and red wavelengths are absorbed and blue wavelengths are transmitted. (1) IB Questionbank Biology 18
19 41. Which diagram represents the process of cyclic photophosphorylation? 42. What would be the effect of increasing temperature on the rate of photosynthesis in a green plant? A. It increases constantly. B. It increases up to a point and then remains constant. C. It increases up to a point and then decreases. D. It remains constant. IB Questionbank Biology 19
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