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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(LL)W/CONNECT PKG
- What two products result from photosynthesis? a. water and carbon dioxide b. water and oxygen c. glucose and oxygen d. glucose and carbon dioxidearrow_forwardWhat is the energy of a photon first used to do in photosynthesis? a. split a water molecule b. energize an electron c. produce ATP d. synthesize glucosearrow_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_forward
- The main purpose of the light-independent reactions is to ________. a. convert solar energy to chemical energy b. convert solar energy to ATP for short-term energy use c. build carbohydrates for long-term energy storagearrow_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_forwardIn the photosynthetic formation of ATP, the enzyme ATP synthase couples the synthesis of ATP to: A. the diffusion of protons B. the reduction of NADP+ C. the excitation of chlorophyll D. the reduction of chlorophyll E. CO2 fixationarrow_forward
- Ribulose bisphosphate carboxylase, which might be the most abundant enzyme on Earth, is part of which photosynthetic reaction? A. the Hill reaction B. the light-independent reaction C. photosystem II D. the light-dependent reaction E. photosystem Iarrow_forwardWhat is the difference between the cyclic and noncyclic pathways of photosynthesis? a The cyclic pathway uses electron transport. b The cyclic pathway is light-dependent. c The noncyclic pathway produces NAPDH. d The noncyclic pathway produces ATP.arrow_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_forward
- What molecule is split in the oxygen-releasing light reactions of photosynthesis? A. Water B. Chlorophyll C. Carbon dioxide D. NADPHarrow_forwardUsing the graph comparing photosynthetic rate and absorption of different wavelengths of light, what can be concluded? a) The photosynthesis rate at 550 nm is the highest b) Chlorophyll a absorbs wavelengths at both ends of the spectrum c) Chlorophyll b is associated with the greatest rate of photosynthesis. d) Carotenoids absorb the narrowest range of wavelengths of lightarrow_forwardWhich of the following changes would decrease ATP production in the light-dependent reactions of photosynthesis? a. decreasing the pH of the thylakoid lumen b. decreasing the pH of the chloroplast stroma c. increasing the concentration of NADP+ in the chloroplast stroma d. making the thylakoid membrane freely permeable to protons by adding a proton channel e. two of the above would decrease ATP productionarrow_forward
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College