Concept explainers
The light-dependent reactions of photosynthesis are responsible for the production of
a. glucose.
b. CO2.
c. ATP and NADPH.
d. H2O.
Introduction:
Photosynthesis is a metabolic process that happens in photoautotrophs like plants. It uses water and carbon dioxide to make glucose and release oxygen. It happens in the chloroplast and is divided into light and dark reaction.
Answer to Problem 1U
Correct answer:
Light reaction converts solar energy into chemical energy (ATP and NADPH) for use in dark reaction. Therefore, option c. is correct.
Explanation of Solution
Reason for the correct statement:
Light reaction is directly dependent on the sunlight. It absorbs the solar energy using pigments (chlorophyll) and converts it into ATP and NADPH molecules (chemical energy) by the process of photophosphorylation.
Option c. is given as “ATP and NADPH”.
As “the light-dependent reactions of photosynthesis are responsible for the production of ATP and NADPH”, is the right answer.
Hence, option c. is correct.
Reasons for the incorrect statements:
Option a. is given as “glucose”.
The dark reaction of photosynthesis produces glusoce not light reaction. So, it is a wrong answer.
Option b. is given as “
Carbon dioxide is a by-product of photosynthesis and is released during the dark reaction not light reaction. So, it is a wrong answer.
Option d. is given as “
Water is used during the light reaction of photosynthesis and not produced. So, it is a wrong answer.
Hence, options a., b. and d. are incorrect.
ATP and NADPH molecules are produced during the light reaction of photosynthesis.
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Chapter 8 Solutions
Biology
- The overall flow of electrons in the light reactions is from a. antenna pigments to the reaction center. b. H2O to CO2. c. photosystem I to photosystem II. d. H2O to NADPH.arrow_forwardWhich of the following descriptions about photorespiration is not correct? Select one: a. Rubisco binds O2 instead of CO2. b. Carbon dioxide is released without producing ATP. c. It limits damaging products of light reactions that build up in the absence of the Calvin cycle at low CO2 concentrations. d. Peroxisomes and mitochondria rearrange and split the compound made by rubisco to fix CO2. e. It occurs in hot and dry conditions.arrow_forwardThe oxygen given off by photosynthesis comes froma. H2O. c. glucose.b. CO2. d. RuBP.arrow_forward
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- Which of the following is true of light-independent reactions of photosynthesis? Select all that apply. a. Light-independent reactions occur in the stroma. b. Water molecules are split during light-independent reactions. c. Chlorophyll absorbs energy from sunlight. d. Carbon dioxide is necessary for light-independent reactions.arrow_forwardBoth the light reactions and light-independent reactions of photosynthesis… Select one: a. None of the options are true. b. use NADPH. c. fix CO2. d. synthesize ATP. e. rely on electron transport.arrow_forwardThe light dependent reactions of photosynthesis are characterized by A. oxidation of carbon dioxide, release of oxygen, synthesis of glucose. B. release of oxygen, fixation of carbon dioxide, hydrolysis of ATP. C. oxidation of water, reduction of NADP+ , hydrolysis of ATP. D. reduction of oxygen, oxidation of NADPH, formation of ATP. E. oxidation of water, reduction of NADP+ , formation of ATP.arrow_forward
- Which of the following are inputs to photosynthesis? Choose all that apply. Which are outputs? Choose all that apply. a. CO2 b. O2 c. sugar d. H2O e. lightarrow_forwardWhich of the following options best explains how less chlorophyll would affect the proces of photosynthesis in plants? 6. A. It would increase the rate of photosynthesis because of the increased production of food. B. It would limit the amount water plants are able to take in, resulting in a slower rate of photosynthesis. C. It would increase the production of oxygen because the plant would need to work hard to feed themselves. С. D. It would limit the amount of light absorbed by the plant and decrease the amount of food the plant is able to produce for itself.arrow_forwardThe overall flow of electrons in the light-dependent reactions is froma. antenna pigments to the reaction center.b. H2O to CO2c. photosystem I to photosystem II.d. reaction center to NADPHarrow_forward
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