The previous section explained how noncyclic electron flow results in the reduction of NADP + to NADPH. But there is an optimum rate. The electron transfers of the light reactions provide the energy for the synthesis of two compounds vital to the dark reactions: NADPH and ATP. In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb energy from sunlight. 1. In Summary: The Light-Dependent Reactions of Photosynthesis. Photosynthesis takes place in two stages, namely light-dependent reactions and light-independent reactions. A photosystem is a photosynthetic unit comprised of a pigment complex and electron acceptor; solar energy is absorbed and high-energy electrons are generated. The protein complexes and the pigment molecules help in the production of NADPH and ATP. The second part, which uses the chemical energy created by the first part to produce plant carbohydrates for plant food, is made up of light-independent reactions. This pathway occurs in the thylakoid membranes and requires participation of two light-gathering units: photosystem I (PS I) and photosystem II (PS II). Light reaction is the first stage of photosynthesis process in which solar energy is converted into chemical energy in the form of ATP and NADPH. Contributors and Attributions; The light reactions, also known as photolysis reactions, convert energy from the sun into chemical energy in the form of NADPH and ATP.These reactions must take place in the light and in chloroplasts of plants. The light-independent reactions are also called the Calvin cycle, after chemist Melvin C. Calvin who won the Nobel prize in chemistry in 1961 after identifying the process. The most common and abundant pigment is chlorophyll a. Page ID 483; Table of contents. In the thylakoid membrane. ... Where do light reactions occur in the chloroplasts? Namely, the higher the light intensity, temperature, carbon dioxide and chlorophyll concentration, the faster the rate at which photosynthesis occurs. D fixation of carbon dioxide, release of oxygen, synthesis of … A photon strikes photosystem II to initiate photosynthesis. How Light-Dependent Reactions Work. The following table summarizes the key events of the light-dependent reactions. The first process in the light-dependent reactions of photosynthesis is. The process of light reaction is given below- Place the following events in the correct order in which they occur during the first electron transport chain of the light reactions, between photosystem 2 and photosystem 1. To complete this table, first select the true statement (from possible statements) for each row in the "Description of Event" column. Then, in the "Order" column, determine the order in which your sele events occur, from 1 to 6. The light dependent reactions produce oxygen gas and convert _____ and _____ into the energy carriers ATP and NADPH. 2. Light-dependent reactions are also called light reactions and occur during the day time. In the case of light intensity, photosynthesis rate is higher in red or blue light and very low in green light. Photosynthesis Problem Set 1 Problem 6: Events during light reactions What three events occur during the light reactions of photosynthesis? A reduction of oxygen, oxidation of NADPH, formation of ATP. 3. Light-independent reaction is also called the dark reaction or the Calvin cycle. B oxidation of water, reduction of NADP +, formation of ATP. The overall function of light-dependent reactions, the first stage of photosynthesis, is to convert solar energy into chemical energy in the form of NADPH and ATP, which are used in light-independent reactions and fuel the assembly of sugar molecules. 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