EBK BIOLOGY
5th Edition
ISBN: 9780133996807
Author: Maier
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 5, Problem 7LTB
Summary Introduction
Introduction:
The process that converts carbon dioxide into water and sugar by using sunlight is termed as photosynthesis. It changes solar energy to chemical energy needed by all living beings. Solar energy is utilized by plants and other photosynthetic organisms for rearranging the CO2 and water from the environment into carbohydrates and releasing oxygen as an end product.
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What is the overall outcome of the light reactions in photosynthesis?
NADPH and ATP molecules are produced during the light reactions and are used to power the light independent reactions.
NADPH and ATP molecules are produced during the light reactions, which are used to power the light dependent reactions.
Sugar and ATP are produced during the light reactions, which are used to power the light independent reactions.
Carbon dioxide and NADPH are produced during the light reactions, which are used to power the light dependent reactions.
Which of the following defines photorespiration?
The metabolic pathway by which most autotrophs use the energy of light to make sugars from carbon dioxide and water
The light-independent reactions of photosynthesis
Process by which electron flow through electron transfer chains sets up a hydrogen ion gradient that drives ATP formation
An inefficient metabolic pathway of producing sugars that occurs when O2 attaches to rubisco
Which of the following scenarios happens during the light-dependent reaction of photosynthesis?
Oxygen gas is produced in the thylakoid lumen by the oxidation of water by photosystem I.
Ferrodoxin and NADP+ reductase participates in the reduction of NADP+ to NADPH.
Carbon dioxide enters the plants via stomata.
Rubisco attaches three molecules of ribulose bisphosphate (RuBP) to one molecule of carbon dioxide.
Chapter 5 Solutions
EBK BIOLOGY
Ch. 5 - Prob. 1LTBCh. 5 - Carbon dioxide functions as a greenhouse gas by...Ch. 5 - Prob. 3LTBCh. 5 - Prob. 4LTBCh. 5 - Stomata on a plants surface ___________. prevent...Ch. 5 - Prob. 6LTBCh. 5 - Prob. 7LTBCh. 5 - Which of the following human activities generates...Ch. 5 - Prob. 9LTBCh. 5 - Prob. 10LTB
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- 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.arrow_forwardWhat is the overall purpose of the light reactions in photosynthesis?arrow_forwardWhich of the following does not occur in anoxygenic photosynthesis? Bacteriochlorophyll is involved in the light reaction. Water is split into oxidized and reduced parts. The system operates under anaerobic conditions. O ATP is formed via cyclic photophosphorylation.arrow_forward
- Identify the correct compound to create a chemical equation that represents Photosynthesis. + Drag and drop the right reactants and products of the Light Dependent and Light Independent (aka Dark) Reactions. Chloroplast NADPH NADP+ ADP Water - H20 Calvin Cycle Glucose - C6H1206 ATP Light Reaction Thylakoids Stroma O2 Carbon Dioxide CO2 Identify the reactants and products that are used and given off by plants and animals.arrow_forwardWhich of the following statements is FALSE? Water is the ultimate electron donor. Photosystem II has chlorophylls in its reaction center that has maximum light absorption at 680 nm. Plastoquinone has a higher reduction potential than plastocyanin. Proton gradient is created in the light phase of photosynthesis wherein the pH in the stroma is higher than in the lumen.arrow_forwardWhich of the following statements about photosynthesis is NOT true? Light independent reactions are very similar to the electron transport chain of cellular respiration Light is absolutely essential for both aspects of photosynthesis In order replace electrons, water is split to form oxygen gas Light dependent reactions are very similar, but in reverse, to the Krebs cycle and glycolysisarrow_forward
- Which of the following best describes the products of the photochemical reactions of photosynthesis?A) NADH and ATP are made in the stromaB) NADPH and ATP are made in the stromaC) NADH and ATP are made in the thylakoid lumenD) NADPH is made in the stroma and ATP is made in the thylakoid lumenE) NADPH and ATP are made in the thylakoid lumenarrow_forwardWhich 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 correctarrow_forwardWhich of the following is not produced during the light reactions of photosynthesis? H2O NADPH O2 ATParrow_forward
- Which of the following is FALSE about photosynthesis? Group of answer choices: -Organisms that can utilize light energy as a food source are called autotrophs. -Photosynthesis occurs in the chloroplasts. -The light phase of photosynthesis produces ATP and NADH. -Carbohydrates, with the aid of energy and reducing power produced from the light phase, are synthesized from carbon dioxide and water.arrow_forwardPhotosynthesis is a complex process. Two main stages of photosynthesis are: H20 co 1 Light dependent reactions This step converts light energy to chemical energy. Light NADP 2 Calvin Cycle Also known as the light independent reaction. In this stage, CO2 is taken up by one of the molecules in the cycle. ATP and NADPH reduce CO2 to a carbohydrate (G3P). ADP LIGHT CALVIN REACTIONS CYCLE Thylakoid Stroma NADPH 1. Inside of the chloroplast, chlorophyll molecules absorb light and convert light energy to chemical energy. In what stage of photosynthesis is chlorophyll needed? Why? Chloroplast (CH20] (sugar) 6 CO2 + 12 H20 + light energy → CeH12O6 + 6 O2 + 6 H20 carbon dioxide + water + light energy > glucose + oxygen + water 3. What are the inputs/ reactants for Calvin cycle? 2. What are the two outputs/ products of light dependent reactions?arrow_forwardPlace the following steps of the Light-Reactions of Photosynthesis in order. Production of NADPH Absorption of light Electron transport chain & Production of ATP Photosystem II Photosystem Iarrow_forward
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