Gas exchange usually results in a loss of o Desert plants have special Photosynthesis has an optimal and is limited by amounts of on 3: Cellular Respiration (Aerobic Respiration) All fiving things need The food (. is broken down to and energy is
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- Step Input Output Light Dependent Reactions Light Independent Reactions (Dark Reactions) Write the full chemical equation for photosynthesis below: Eactors that Affect Photosynthesis Gas exchange usually results in a loss of o Desert plants have special, • Photosynthesis has an optimal and is limited by amounts of Section 3: Cellular Respiration (Aerobic Respiration) All living things need The food ( is broken down to and energy is released in the form of Write the chemical equation for cellular respiration below: Step 1: Glycolysis step process that breaks down into two smaller Results in small amounts of Does not require (anaerobic) Occurs outside Input Output © 2020 to present Keystone Sclence - All Rights Reserved www.teacherspayteochers.com/Store/Keystone-Sciencechemicals called uncoouplers can make membranes permeable to small molecules and ions. What effect might uncouplers have on photosyntehesis? increased ATP becuase cyclic electron transport woulnd increase Decrease Atp producctuion because proton gradient woudl increase decreased AtP production because proton gradient would decrease Decreased NADPH production becuause proton gradient would increase Decreased NADPH production because proton gradient would decreasePhotosynthesis directly opposes respiration in determining how plants influence atmospheric CO2 concentrations. When a leaf is in the light, both photosynthesis and respiration are occurring simultaneously. The data in the Table were collected from the leaf of a sagebrush plant that was enclosed in a chamber that measures the rate of CO2 exchange. The same leaf was used to collect the data in Interpret the Data in Chapter 7. Respiration is shown as a negative and photosynthesis as a positive rate of CO2 exchange. The net photosynthesis rate is the amount of CO2 (in micromoles per square meter per second) assimilated by the leaf while respiration is occurring; a positive value indicates more photosynthesis is occurring than respiration. The light exposed to the leaf is quantified as the number of photons in the 400 to 700 nm wavelength, the photosynthetic photon flux density (PPFD); 2,000 mol/m2/s is equivalent to the amount of light occurring at midday in full Sun. Observation Photosynthetic Photon Flux Density (PPFD) (mol/m2/s) Net Photosynthesis (mol/m2/s) 1 2,000 9.1 2 1,500 8.4 3 1,250 8.2 4 1,000 7.4 5 750 6.3 6 500 4.8 7 250 2.2 8 0 -2.0 Why is net photosynthesis negative when PPFD is zero? Looking at the respiration data from Interpret the Data in Chapter 7, at what temperature do you think these data were collected? Source: Data based on unpublished research by Brent Ewers, University of Wyoming.
- 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)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 loopIn chloroplasts, protons are pumped out of thestroma across the thylakoid membrane, whereas in mito-chondria, they are pumped out of the matrix across thecrista membrane. Explain how this arrangement allowschloroplasts to generate a larger proton gradient acrossthe thylakoid membrane than mitochondria can generateacross the inner membrane.
- Question 6 Review the two stages of photosynthesis. Match the term and its description. Each term can only be used once. thylakoid membranes [ Choose ] stroma | Choose Convert light energy to chemical energy. Release oxygen as a by- product [ Choose | > >Absorption Chlorophyll a Chlorophyll s 400 450 500 550 600 650 700 Wavelength (nm) Plant chlorophyll chemicals will absorb, or take in, light wave eniergy in arder to produce ther molecules used for cellular energy. Reflected light refers to those wovelengths of light thet will of the chlorophyll and not be absorbed. Select the conclusion that most accurately summarizes the data in diagram 3. Red and blue light waves have equal importance during photosynthesis. The majority of light energy is attained from red light, while the blue light waves provide additiicn photosynthesis. The majority of light energy is attained from blue light, while the red light waves provide ado photosynthesis. O Medium length light waves are important to photosynthesisATP synthasederives energy for the generation of ATP from Group of answer choices; solar energycaptured by the light reactions changing the shape of the enzyme. the movement ofhydrogen ions down their concentration gradient from the thylakoid space to thestroma. electronstransferred from NADPH causing the enzyme to change shape. the splitting of H 2O, which releases electrons. the movement ofhydrogen ions against their concentration gradient into the thylakoidspace.
- am.edgenuity.com/Player/ Unit Test Active 11 12 13 14 15 16 17 20 TIME REMAINING 01:46:28 Which statement best describes the relationship between photosynthesis and cellular respiration? O Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere. O Photosynthesis is part of the carbon cycle, and cellular respiration is not. O Only plants perform photosynthesis, and only animals perform cellular respiration. O Photosynthesis releases carbon into the atmosphere, and cellular respiration removes carbon from the atmosphere. Mark this and return Save and Exit Next SubmitDiogrom 8: Temperature and Rote of Photosynthesis 5 10 15 20 25 30 35 40 temperature (C) Seiect the pasage that best summarizes the data in the graph. O Rates of photosymthesis will decrease as the temperature increases. Rates of photosynchesis willl continue to increase as the temperature increases. Rates of photosymthesis will increase and then decrease as the temperature increases. Rates of photosynthesis will decrease and then increase as the temperature increases. rate of photosynthesisExcited molecules can return to the ground state by severalmeans. Describe each briefly. Which of these processes areimportant in photosynthesis? Describe how they function ina living organism.