and Rate of Photosynthesis5 10 15 20 25 30 35 40temperature ("C)he most accurate explanation for lower rates of photosynthesis at high temperatures would beThe water splitting enzyme and ATP synthase will change their shapes at higher temperature and nDThere is less light at high temperatures to power the light dependent reactions.D Less O is available to power the Calvin Cycle when temperatures are high.There is a lower availability of CO2 for photosynthesis at higher temperatures.rate of photosynthesis

Introduction: The correct choice is the first option.

e most accurate explanation for lower rates of photosynthesis at high temperatures would be The water splitting enzyme and ATP synthase will change their shapes at higher temperature and n There is less light at high temperatures to power the light dependent reactions. Less O is available to power the Calvin Cycle when temperatures are high. There is a lower availability of CO, for photosynthesis at higher temperatures

e most accurate explanation for lower rates of photosynthesis at high temperatures would be The water splitting enzyme and ATP synthase will change their shapes at higher temperature and n There is less light at high temperatures to power the light dependent reactions. Less O is available to power the Calvin Cycle when temperatures are high. There is a lower availability of CO, for photosynthesis at higher temperatures

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 2TYK

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Match each term with its most suitable description. ____ PGAL formation a. absorbs light ____CO2 fixation b. converts light to chemical energy ____ autotroph c. self-feeder ____ ATP forms NADPH does not d. electrons cycle back to photosystem ____ photorespiration e. problem in C3 plants ____ photosynthesis f. Calvin-Benson cycle product ____ pigment g. water molecules split ____ photolysis in photosynthesis h. rubisco function
In ________, electrons that have been energized by light contribute their energy to add phosphate to ADP, producing ATP. (a) crassulacean acid metabolism (b) the Calvin cycle (c) photorespiration (d) C4 pathways (e) photophosphorylation
Plants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm (x- rays), 450nm (blue light), 670nm (red light), and 800nm (infrared light). Which plants harness the most energy for photosynthesis? X-ray irradiated plants Blue light irradiated plants Red light irradiated plants Infrared irradiated plants
Figure 5.7 On a hot, dry day, plants close their stomata to conserve Water. What impact will this have on photosynthesis?
The Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+
Figure 8.18 Which of the following statements is true? In photosynthesis, oxygen, carbon dioxide, ATP, and NADPH are reactants. G3P and water are products. In photosynthesis, chlorophyll, water, and carbon dioxide are reactants. G3P and oxygen are products. In photosynthesis, water, carbon dioxide, ATP, and NADPH are reactants. RuBP and oxygen are products. In photosynthesis, water and carbon dioxide are reactants. G3P and oxygen are products.
A decrease in entropy occurs during the CO2 uptake phase of the Calvin cycle, as freely moving CO2 molecules become fixed into a carbon skeleton. How can this occur without direct participation by NADPH and/or ATP?
The Calvin-Benson cycle starts when a. light is available b. carbon dioxide is attached to RuBP c. electrons leave a photosystem II
In photolysis some of the energy captured by chlorophyll is used to split (a) CO2 (b) ATP (c) NADPH (d) H2O (e) both b and c
If four molecules of carbon dioxide enter the Calvin cycle (four “turns” of the cycle), how many G3P molecules are produced and how many are exported? 4 G3P made, 1 G3P exported 4 G3P made, 2 G3P exported 8 G3P made, 1 G3P exported 8 G3P made, 4 G3P exported
Photosynthesis 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.
Match each term with the best description. ______ PGAL a. absorbs light ______ CO2 fixation b. converts light to chemical energy ______ photolysis c. self-feeder ______ ATP forms; NADPH does not d. electrons cycle back to photosystem I ______ photorespiration e. problem in C3 plants ______ photosynthesis f. Calvin-Benson cycle product ______ pigment g. water molecules split ______ autotroph h. rubisco function