Concept explainers
The light reactions of photosynthesis supply the Calvin cycle with
- A. light energy.
- B. CO2 and ATP.
- C. O2 and NADPH.
- D. ATP and NADPH.
Introduction:
The reaction directly dependent on light are called light reaction and occurs in the grana and stromal thylakoid of chloroplast. The light independent reaction is called the dark reaction. It occurs in the stroma of chloroplast.
Answer to Problem 1TYU
Correct answer:
Light reaction uses the sunlight to split water and pass electron through the photosystems to make energy for the production of sugar by the dark reaction. Therefore, option (D) is correct.
Explanation of Solution
Reason for the correct statement:
Thylakoid present in the chloroplast has two types of photosystems. These help in the conversion of solar energy into the usable chemical energy. Photosystem I produces ATP only and photosystem II produces ATP and NADPH. These chemical forms of energy are used in Calvin cycle to make sugar.
Option (D) is given as “ATP and NADPH”.
“The light reaction of photosynthesis supply the Calvin cycle with ATP and NADPH”, it is the right answer.
Hence, option (D) is correct.
Reasons for the incorrect statements:
Option (A) is given as “light energy”.
The light reaction requires light energy to produce, ATP and NADPH molecules. So, it is a wrong answer.
Option (B) is given as “
Carbon di oxide is supplied to the calvin cycle but not the ATP. So, it is a wrong answer.
Option (C) is given as “
NADPH and oxygen are given by the light reaction but oxygen is not supplied to the Calvin cycle, it has no use in it. So, it is a wrong answer.
Hence, options (A) (B) and (C) are incorrect.
The light reaction provides the dark reaction, Calvin cycle, with ATP and NADPH for making organic products.
Want to see more full solutions like this?
Chapter 8 Solutions
Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
Additional Science Textbook Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Fundamentals of Anatomy & Physiology (11th Edition)
Microbiology with Diseases by Taxonomy (5th Edition)
Laboratory Experiments in Microbiology (11th Edition)
Biological Science (6th Edition)
Fundamentals of Anatomy & Physiology Plus Mastering A&P with eText - Access Card Package (10th Edition) (New A&P Titles by Ric Martini and Judi Nath)
- The Calvin-Benson cycle starts with _______. a. the absorption of photon energy b. carbon fixation c. the release of electrons from photosystem II d. NADP+ formationarrow_forwardIn ________, 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) photophosphorylationarrow_forwardWhich part of the Calvin cycle would be affected if a cell could not produce the enzyme RuBIsCO?arrow_forward
- When oxygen gas is released as a result of photosynthesis, it is a direct byproduct of what process? a. splitting of water molecules b. the electron transfer system in the photosystems c. chemiosmosis d. reducing of NADP+arrow_forwardThe role of photosystem 1 and photosystem 2 in the process of photosynthesis is to a. absorb sunlight and distribute the energy as heat b. absorb sunlight and transfer the energy to electrons c. form ATP as hydrogen ions cross the thylakoid membrane d. transfer electrons to form NADPHarrow_forwardThrough light reductions, ADP is phosphorylated into ATP via chemiosmosis. What is this process called? a. Reduction b. Calvin Cycle c. Photophosphorylation d. Photosynthesisarrow_forward
- How are the NADPH and G3P molecules made during photosynthesis similar? a. They are both end products of photosynthesis. b. They are both substrates for photosynthesis. c. They are both produced from carbon dioxide. d. They both store energy in chemical bonds.arrow_forwardExplain briefly why the following ideas are false. a. Photosynthesis is the food-making process done by plants. b The Calvin cycle was called the dark reactions because it can only take place in the absence of light. c. Photosynthesis can only be powered by sunlight.arrow_forwardHow is the difference made up in the Calvin cycle when more ATP is used than NADPH? A. The Calvin cycle occurs half as often as the light-dependent reaction B. The cyclic pathway creates more ATP C. Additional ATP is created from glucose D. Excess NADPH is reused in the light reactionarrow_forward
- ________ reactions of photosynthesis generate NADPH and ATP to carry solar energy. a. The light-independent b. The light-dependent c. Both the light-dependent and -independentarrow_forwardThe overall process of photosynthesis a. results in the reduction of CO2 and the oxidation of H2O. b. results in the reduction of H2O and the oxidation of CO2. c. consumes O2 and produces CO2. d. produces O2 from CO2.arrow_forwardUnder certain conditions, the thylakoid membrane of the chloroplast may become 'leaky’ allowing ions to freely diffuse across it. A consequence of that is carbon fixation will stop. Why would the Calvin Cycle stop? A. Because oxidation of water by PSII would stop. B. Because reduction of NADP+ to NADPH would stop. C. Because the stroma would contain ADP but no ATP. D. Because levels of G3P in the stroma would increase.arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning