S + O2 --> SO2. Light striking a plant pigment known as chlorophyll initiates a complex series of reactions, many of which involve redox processes complete with movement of electrons. These oxidizing agents are also called oxygenation reagents or oxygen – atom transfer (OAT) agents. How do Plants Carry Out Cellular Respiration? Substrate-level vs. oxidative phosphorylation. Electron carriers. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. Oxidizing agents can be defined as those groups which transfer oxygen atoms to the substrate although it's not true in every case as in many redox reactions, oxidation – reduction takes place in absence of oxygen atoms. The common oxidizing agent in this process is molecular oxygen. This is the combustion of sulfur. Let's look at another example with a different reducing agent. Oxygen is the oxidizing agent so it is being reduced. For example, organisms use electron acceptors such as NAD + to harvest energy from redox reactions as in the hydrolysis of glucose: ... MnO 4-is the oxidizing agent in the above reaction. Generally In Photosynthesis Photosystem II oxidized by using electrons from water molecules directly and got exicited ( that is P680*) Where as P700 will exicited with series of electrons. Eg. Oxidizing and Reducing Agents An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Mehler observed that the H 2 O 2 formed in this way does not present an active intermediate in photosynthesis; rather, as a reactive oxygen species, it can be toxic to surrounding biological processes as an oxidizing agent. Now let's try a different oxidizing agent with glucose. Common oxidizing agents include Oxygen and halogens. That plants resort to cellular respiration may seem a little confusing, as we have always been told that they produce energy by resorting to photosynthesis. Oxidizing agents or oxidants: An oxidizing agent or oxidant is a substance which oxidizes the other substance and itself gets reduced. The Mehler reaction is named after Alan H. Mehler, who, in 1951, presented data to the effect that isolated chloroplasts reduce oxygen to form hydrogen peroxide (H 2 O 2). ... And in photosynthesis, the reducing agents accompish a task which is essential to our survival. P680+ is said to be the strongest biological oxidizing agent. Oxidizing Agents. Given its function, why is this necessary? Examples of oxidizing agents Photosynthesis is the means by which we get the oxygen we need for life. The atom or molecule that accepts the electrons (in this case, chlorine) is known as the oxidizing agent, because its acceptance of electrons allows the other molecule to become oxidized. Intro to redox in cellular respiration. If one reagent in a reaction contributes oxygen, extracts hydrogen, or extracts electrons, it is said to be an oxidizing agent. 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