Initial event Final event Final event Answer Bank Hydrogen ions are pumped into the interior of the thylakoid. The light-dependent reactions synthesise ATP and the reductant NADPH. The light-dependent reactions of photosynthesis require sunlight. Aligned to: LO 2.5 CA 2.5: Explain Energy Use, Storage & Capture 5. The light reaction is a light-dependent process which includes a series of events such as light absorption, hydrolysis, the release of oxygen, formation of ATP and NADPH. Initial Event: - Photons of light excite electrons on specific chlorophyll molecules. Answers: 3 on a question: Which events take place in the light-dependent reactions of photosynthesis? The question contains content related to Chemistry and Science. Ionization of pigments. As the name suggests, the light-dependant reaction depends on sunlight to carry out photosynthesis. Light energy is converted to sugars; sugars are broken down for energy. The difference between cyclic and noncyclic photophosphorylation is mainly due to the following factors: Type of photosynthesis: Cyclic photophosphorylation occurs during anoxygenic photosynthesis, while noncyclic photophosphorylation occurs in oxygenic photosynthesis. Photosynthesis Overview Quiz: Test! - ProProfs Quiz The light reaction of light dependent reaction occurs in the chloroplast of the mesophyll cells of the leaves. Light-Dependent Reactions. d. light energy is captured by plants; light energy is . Bio Test 4 | Biology Quiz - Quizizz Chlorophyll molecules release electrons that travel down an electron transport chain. The light reaction is also known as photolysis reaction and takes place in the presence of light. How do the events in the Calvin cycle depend on the light ... This reaction occurs in the thylakoid membrane which is present in the chloroplas of the leaves. Overall reaction of photosynthesis Light Energy 6CO 2 + 12H 2 O Chlorophyll → C 6 H 12 O 6 + 6O 2 + 6H 2 O Photosynthesis involves two types of reactions namely, light reactions and dark reactions. In PSII, energy from sunlight is used to split water, which releases two electrons, two hydrogen atoms, and one oxygen atom. Q. 2) The water molecule is split. This process mainly involves light absorption, splitting of molecules, oxygen release and formation of high energy chemicals like ATP and NADPH. The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place. The light dependent reactions c. Glycolysis d. The electron transport chain 37. Other names for light-independent reactions include the Calvin cycle, the Calvin-Benson cycle, and dark reactions. The option table are given for you to answer the needed materials and end products of photosynthesis. The light-dependent reaction takes place within the thylakoid membrane and requires a steady stream of sunlight, hence the name light-dependent reaction. The Calvin cycle is the term used for the reactions of photosynthesis that use the energy stored by the light-dependent reactions to form glucose and other carbohydrate molecules ( Figure 1 ). 3. photosystem I. Location of Light - Dependent Photophosphorylation The electron transport chains for photosynthesis is carried out in the thylakoid membranes of chloroplasts. Light-dependent 1. Photosynthesis occurs in two phases: 1 . Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH. Light energy is captured by plants; light energy is converted . A pigment molecule in the photosystem absorbs one photon, a quantity or "packet" of light energy, at a time. answer: granum, light-dependent reactions, thylakoid, stroma lumen, and Calvin cycle. Answer (1 of 2): > How do the events in the Calvin cycle depend on the light-dependent reactions? ATP synthesis: ATP synthesis during the cyclic electron flow of anoxygenic photosynthesis is known as cyclic photophosphorylation. A photosystem consists of 1) a light-harvesting complex and 2) a reaction center the chemical changes that occur only during the light-dependent reactions. 4) Electrons are transported from PSII to PSI. In both photosystem I and photosystem II, light energy is used to excite electrons. 5) ATP and NADPH are produced. In this process light energy is converted to chemical energy in the form of energy reserving molecules ATP and NADPH. The Calvin cycle, which takes place in the stroma, uses energy derived from these compounds to make GA3P from CO2. Major Events and Features of Photosynthesis Reaction Sites Needed Materials End Products 1. The general features of a widely accepted mechanism for photoelectron transfer, in which two light reactions (light reaction I and light reaction II) occur during the transfer of electrons from water to carbon dioxide, were proposed by Robert Hill and Fay Bendall in 1960. A photosystem consists of 1) a light-harvesting complex and 2) a reaction center It turns out that part of the light energy absorbed by the pigments in the leaves is converted in a different way, into chemical energy . The light-dependent reactions begin in photosystem II. ∙ 2010-12-12 21:54:32. Copy. In PSII, energy from sunlight is used to split water, which releases two electrons, two hydrogen atoms, and one oxygen atom. The primary components of the light-dependent reactions are shown in Figure 1. The light-dependent reactions are depicted in . a. Photosystem II Light shining on pigments energizes electrons that come from water. Wiki User. Light energy is converted to sugars; sugars are broken down for energy. The graph below shows the relationship between the absorption spectrum The chlorophyll absorbs energy from the light waves, which is converted into chemical energy in the form of the molecules ATP and NADPH. 1) Light enters the chloroplast. 3. Best Answer. The light-dependent reactions, as stated above, occur prior to the Calvin cycle. This 20 words question was answered by Heather L. on StudySoup on 5/31/2017. c. light energy is converted to chemical energy; chemical energy is used to make sugar. Remember that the purpose of this first part of photosynthesis is to convert sunlight energy into other forms of energy? Student Answer: The chloroplast is the site of photosynthesis. _________79 Chlorophyll molecules are found embedded along the thylakoid membrane. Protein complexes and pigment molecules work together to produce NADPH and ATP. answer choices. Production of Adenine tri phosphate (ATP) and NADPH from solar radiation occurs in the light dependent reactions of photosynthesis. Stroma commonly refers to the fluid filled inner space of chloroplasts surrounding thylakoids and grana. The stage of photosynthesis that uses the most ATP molecules is a. C. The NDSU Virtual Cell Animation Project presents 'Photosynthesis - The Light Reactions'. 3. Takes place on the membrane. What is Stage 1 of photosynthesis called? Light dependent reactions is a phase of photosynthesis in which two molecules are produced i. e. ATP and NADPH. 3) Oxygen is released as waste. Light energy is captured by plants; light energy is converted . answer: granum, light-dependent reactions, thylakoid, stroma lumen, and Calvin cycle. 1) Light dependent reactions i.e; photophorylation reactions. During the light-dependent reactions, an electron that's excited in PSII is passed down an electron transport chain to PSI (losing energy along the way). Light energy is converted to chemical energy; chemical energy is used to make sugar. For more information please see http://vcell.ndsu.edu/animationsPhot. - [Voiceover] We've seen in previous videos that photosynthesis can be broken down into the light-dependent reactions and the Calvin cycle. During the light-dependent reaction of photosynthesis, light energy is converted into which form of energy? Light is trapped by the thylakoid membrane. Photosystem II comes first in the sequence of events that moves electrons from water molecules to their destination, NADP+. An absorption spectrum is a graph that plots a pigment's degree of light absorption at different wavelengths of light. the source of carbon atoms in the carbohydrate product (sugar) . Transcribed image text: Question 7 of 17 > Arrange the events of the light-dependent reactions of photosynthesis in the order that they occur. As mention earlier, the light reactions take place in the thylakoid membranes of chloroplasts. During the light-dependent reactions of photosynthesis, which event must occur for ATP synthase to function properly? What are the three primary factors that affect the rate of photosynthesis? Moreover, which events take place in the light dependent reactions of photosynthesis quizlet? Light-dependent reactions of photosynthesis at the thylakoid membrane In photosynthesis, the light-dependent reactions take place on the thylakoid membranes. The light-independent reactions require carbon dioxide, occur in the stroma, and produce high-energy sugars. sugars. The light-dependent reactions are depicted in . b. light energy is captured by plants; light energy is used to make sugar. 28. Initially, the stroma was thought to simply provide support for the pigmented thylakoids. The light-dependent reactions convert light energy into chemical energy. There are 4 steps to a light-dependant reaction. However it is now known that the stroma contains starch, chloroplast DNA and ribosomes, as well as all the enzymes required for light-independent reactions of photosynthesis, also known as the Calvin . Water is split to replace the electrons, releasing oxygen as a by-product. Since its upload, it has received 99 views. 1. photosystem II. The light-dependent reac-tions require light and water, occur in the thylakoids, and produce ATP and NADPH. It is the reduction of CO2, and it occurs during the Calvin cycle. the chemical changes that occur only during the light-dependent reactions. The goal of the light-dependent reactions of photosynthesis is to collect energy from the sun and break down water molecules to produce ATP and NADPH. Light Dependent Reactions Light Reaction Definition "Light reaction is the process of photosynthesis that converts energy from the sun into chemical energy in the form of NADPH and ATP." What is Light Reaction? Light dependent reactions of photosynthesis takes place in the thylakoid membrane of chloroplast. Structurally it is divided into two areas: the stroma and the lumen. Which events take place in the light-dependent reactions of photosynthesis? C) It requires light. A) It takes place in the stroma. Stage one of photosynthesis is the light-dependent reaction, wherein the organism uses sunlight to make carrier molecules for energy. The light reaction of photosynthesis initiates only when it is supplied with light energy. Originally Answered: What are the main events of light reaction? In a series of reactions within a redox chain, or electron transport chain, the energy from the electron is converted into ATP and NADPH. These energy-carrying molecules travel into the stroma where . needed during the light-dependent reactions to produce ATP. * ATP and NADPH energy is used to conver. Light energy is converted to chemical energy; chemical energy is used to make sugar. In which locations do each of these events occur? The Calvin cycle actually requires the use of the products from the light dependent reactions. When a chlorophyll a molecule within the reaction center of PSII absorbs a photon, the electron in this molecule attains a higher energy level. B) It takes place in chloroplasts. The products of the light-dependent reactions, ATP and NADPH, are both required for the endergonic light-independent reactions. The light-dependent reactions occur in the stroma, while the The pathway of electrons. Student Answer: The chloroplast is the site of photosynthesis. In this process light energy is converted to chemical energy in the form of energy reserving molecules ATP and NADPH. The absorbed solar energy or light energy in leaves is converted to chemical energy at the first stage of photosynthesis. In what membrane bound structure do the light dependent reactions of photosynthesis occur a. Thylakoid b. Nucleus c. Cell d. Chlorophyll 36. The first event in the light dependant phase is the ejection of an excited electron from the chlorophyll after sunlight falls on it. It uses ATP and NADPH from the light-dependent reactions so that it can produce high-energy sugars. In PSI, the electron is excited again and passed down the second leg of the electron transport chain to a final electron acceptor. Not Helpful. It is the absorption of CO2 from the air, and it occurs during the light-dependent reactions. In photosynthesis, a light-independent reaction takes place in plant chloroplasts.In this process, sugars are made from carbon dioxide. The two photosystems were named in the order of their discovery, and not in the order of their work in the light-dependent reactions. The process, known as the Calvin cycle, uses products of the light-dependent reactions (ATP and NADPH) and various enzymes.Therefore, the light-independent reaction cannot happen without the light-dependent reaction. In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water. 2) Calvin cycle, light independent reaction. Photosystems exist in the membranes of thylakoids. - Hydrogen ions are pumped into the interior of the thylakoid. You may include a diagram in your answer to support your discussion. The process, illustrated below, begins when light strikes a molecule of chlorophyll and excites electrons to a higher energy state. These reactions occur in the thylakoids of the chloroplasts. The first step in light reaction is reception of photons by photosynthetic pigments. A. Figure 1 The light-dependent reactions harness energy from the sun to produce ATP and NADPH. The role of ____________________ is to provide the matter for sugars which is the main output of photosynthesis. 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