7. The figure shows the effect of light on the rate of photosynthesis Based onthe graph, answer the following questions: (i) At which point(s) A, B or C inthe curve, light is a limiting factor? (ii) What could be the limiting factor/s inregion A? (iii) What do region C and D represent on the curve?Light intensityRate of photosynthesis

Photosynthesis is the process by which atmospheric carbon is fixed in order to produce cellular…

7. The figure shows the effect of light on the rate of photosynthesis Based or the graph, answer the following questions: (i) At which point(s) A, B or C i the curve, light is a limiting factor? (ii) What could be the limiting factor/s i region A? (iii) What do region C and D represent on the curve?

7. The figure shows the effect of light on the rate of photosynthesis Based or the graph, answer the following questions: (i) At which point(s) A, B or C i the curve, light is a limiting factor? (ii) What could be the limiting factor/s i region A? (iii) What do region C and D represent on the curve?

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 4TYK

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What is the significance that the combined absorption spectra of chlorophylls a and b roughly match the action spectrum of photosynthesis? Would photosynthesis be more efficient if their individual absorption spectra coincided exactly?
Diagram 7: Rate of Photosynthesis with increasing light intensity 200 Pmax 150 100 - 50 -50 - -100 100 200 300 400 500 600 700 Light Intensity (arbitrary units) Glossary: 1. Pmax: The maximum pressure of oxygen gas. 2. Arbitrary units: The use of this term mean the graph is not using specific units as lc intensity could be measured in lumens and oxygen production could have been me mm of Hg Identify the light intensity in which oxygen production first begins to reach its maximum value. 200 units 100 units 700 units 500 units Oxygen Production (syun Kegque)
2.) A.) Explain how electron transfer leads to ATP biosynthesis in the light reactions of photosynthesis. You must give details about how electron flow builds a pH gradient and a description of the compartments in the chloroplast in relation to pH. Also, compare the ETC of the mitochondrion with the ETC of the light reactions for both the source and destination for electrons. B.) Would ATP biosynthesis happen if ionophores, which would create holes in the thylakoid membrane and allow uncontrolled passage of charged molecules such as protons between compartments, are provided to the chloroplast? Why or why not? C.) How would you modify Complex I of the electron transport chain to decrease ATP yield from Step 3 of β-oxidation? As part of this, you must explain why there is a difference in ATP yield between NADH and FADH 2 AND give a specific change to the ETC that would decrease ATP yield from Step 3
10. Observe the graph on the right. If you had a hypothetical plant that only had a hypothetical photopigment with an absorption maximum at 585, which color light would produce the highest rate of photosynthesis? ltra Violet Blue 456-492 nm Green 492677 nm Yellow Orange 597-620 nm Red intra vielet red 400-455 nm 677-697 nm 620-700 nm nm 400 500 600 700 short wtength Ieng vetength high fmuency lawhumcy
Which of the mechanisms for dissipating light energy shown in Fig. would best protect the photosystems from excess light energy?
7.Draw the action spectrum of photosynthesis and the absorption spectrum of chlorophyll on the axes below: % use of absorbed light 100 1 50 25 chloro chlorophyll phyll a 400 baction spectrum 500 absorption spectrum 600 wavelength of light (nm) 700 800 100 5 50 25 % absorption of light 8.Make a note on the above diagram (Q=7) to explain why most leaves look green.
5) Draw a flow diagram of the electron flow from photosystem Il to Photosystem I. Flow diagram must contain all three steps of electron flow involved in photosynthesis process
For photosynthesis lab in biology 1) This lab uses spinach leaves. Name another plant that would make an interesting comparison to spinach. Explain why you think this leaf would provide an interesting comparison 2) The lights used in this experiment are 60W. What would you predict the effect of having stronger or weaker wattage bulbs would be on your results? Explain. 3)This lab uses 0.2% sodium bicarbonate. What would you predict the effect of raising or lowering the percentage would be on your results? Explain. 4)What are TWO other things that might be manipulated in an experiment using this same protocol other than the type of leaf, percent sodium bicarbonate, and wattage of light bulb? 5) What key thing do you have to look for on the graph to know for certain that your treatment has caused a significant effect?
1. Outline the steps of an experiment to prove that photosynthesis occurs with both light dependent and light independent phases. What are the materials needed and what is the expected outcome? Include a diagram to support your answer.
Identify the chemical basis for ApH and AY across the chloroplast thylakoid membrane by dragging the descriptions to their targets. Be sure to notice that the upper arrow iindicates ApH and the lower arrow indicates ΔΨ. ATP synthase complex H+ N ADP + P₁ Light energy ATP H*N Photosystem I/II- Chloroplast N side Aus PN ApH T + Thylakoid membrane HTp H+p Lumen Stroma P side Proton circuit A B High H concentration Low positive charge High positive charge Low H+ concentration Within the image, identify the types of proton translocation by dragging each label to its target. O XH₂ 2H+ + Z 2 H* ZH₂ O XH₂ Z 2H+ ZH₂ 2H+ C A B Proton pump Redox loop
(a) Distinguish between photodissociation and photoionization.(b) Use the energy requirements of these two processesto explain why photodissociation of oxygen is moreimportant than photoionization of oxygen at altitudesbelow about 90 km.
Which of the following statements about the light reactions of photosynthesis are correct? 1. Absorption of light does one thing: it makes chlorophyll easier to oxidize. 2. In PSII, the rate of damage to the D1 protein can never exceeds the rate of repair. 3. Electron transport is spontaneous (exergonic) as electrons move from P680* to P700+. 4. Compared to anoxygenic photosynthesis, in oxygenic photosynthesis less light needs to be absorbed to reduce NADP+. A. 1,2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1,2,3 and 4 are correct