The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different? 400 500 600 700 Wavelength of light (nm) O Green and yellow wavelengths inhibit the absorption of red and blue wavelengths. O Oxygen given off during photosynthesis interferes with the absorption of light. O Other pigments absorb light in addition to chlorophyll a. Absorbance of chlorophyll a Violet Blue Green Yellow Orange - Rate of photosynthesis

The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different? 400 500 600 700 Wavelength of light (nm) O Green and yellow wavelengths inhibit the absorption of red and blue wavelengths. O Oxygen given off during photosynthesis interferes with the absorption of light. O Other pigments absorb light in addition to chlorophyll a. Absorbance of chlorophyll a Violet Blue Green Yellow Orange - Rate of photosynthesis

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 15RQ: Plants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm...

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Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?
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
What is the overall purpose of the light reactions in photosynthesis?
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.
Which of the following substances does not participate in the Calvin-Benson cycle? a. ATP c. NADPH e. PGAL b. O2 d. RuBP f. CO2
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
The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If noncyclic photosynthetic electron transport leads to the translocation of 7 H+/2e- and cyclic photosynthetic electron transport leads to the translocation of 2 H+/e-, what is the relative photosynthetic efficiency of ATP synthesis (expressed as the number of photons absorbed per ATP synthesized) for noncyclic versus cyclic photophosphorylation? (Assume that the CF1CF0-ATP synthase yields 3 ATP/14 H+.)
Explain the reciprocal nature of the net chemical reactions for photosynthesis and respiration.
Which of the following pathways requires molecular oxygen (O2)? a. aerobic respiration b. lactate formation c. alcoholic fermentation d. photosynthesis
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
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.
Light energy that is capture in photosynthesis is converted to ______ energy stored in chemical bonds of molecules. Potential Sound Solar Kinetic Why do photosynthesizes contain accessory pigments in addition to chlorophyll a? To reflect different wavelengths on the exterior of the photosynthetic organism. To filter light such that only photons of the right wavelength reach chlorophyll a. To absorb wavelengths of light that chlorophyll a cannon and extend the range of the wavelengths captured. To emit energy beyond the capability of the pigment chlorophyll