The oxygen comes from the splitting of water. Consider the process of photosynthesis. It gets energy from absorbed photons and uses water as a reducing agent. Water molecules are made of one oxygen … All Rights Reserved. In contrast, cellular respiration is an energy-releasing process found in all living organisms where oxygen and glucose are utilized to produce carbon dioxide and water. The oxygen used during photosynthesis comes from splitting water, oxygen is a byproduct of the splitting, and it is removed from the plant. Answers (a)O2comes from water not CO2in photosynthesis: This comes under light dependent processes. Ans. The energy required for photosynthesis comes from the sun as light energy; plants transform this light energy into chemical energy, or sugars. Since the concentration of oxygen was negligible, first photosynthesis took place using hydrogen sulfide and organic acid in sea water. Plants perform this energy conversion using light, water, carbon dioxide and a green substance called chlorophyll. The carbon that plants need for photosynthesis comes from carbon dioxide, or CO2 that's present in our atmosphere. The oxygen during photosynthesis comes from split water molecules. Water acts as a reducing agent by providing H+ ions that convert NADP to NADPH. Copyright © 2021 Multiply Media, LLC. There are only three ingredients needed for photosynthesis. Photosystem II involves the first few steps of the Z-scheme (the diagram of the electron transport chain in photosynthesis) and therefore a reducing agent that can donate electrons is required to oxidize chlorophyll, which is provided by water (acting as a source of electrons in green plants and cynobacteria). will then distribute the water. Photosystem II is the primary known enzyme that acts as catalyst in this oxidation of water. Where does the carbon come from? This problem has been solved! Where did the rabbit’s energy come from? Hello, I am aware that the formula for photosynthesis is as follows: 6 CO2 + 12 H2O → C6H12O6 + 6 O2 + 6 H2O And I also know that the H2O product is a "new H2O", not the same as the reactant. Sunlight includes the full range of colors in the light spectrum. H 2 A + 2 photons (light) → 2 e− + 2 H + + A, where the chemical nature of the 'A' depends on the organism. The cells absorb this energy which is transferred from cell to cell until the P680 pair of chlorophyll molecules absorb it. I understand that an excited electron comes from a chlorophyll a molecule either resulting from the relayed resonance energy from different pigment molecules in Photosystem 680 or from chlorophyll a that have absorbed energy from emitting light photons. This impacts on rates of photosynthesis. The water for photosynthesis comes from water that is absorbed from the soil by the roots of the plant and transported upward to the leaves through the vessels called xylem. Photosynthesis changes sunlight into chemical energy, splits water to liberate O 2, and fixes CO 2 into sugar. During photosynthesis, the plant absorbs water and carbon dioxide. Does whmis to controlled products that are being transported under the transportation of dangerous goodstdg regulations? Explain. The second requires both: sugar contains carbon, oxygen, and hydrogen, of which the first two come from carbon dioxide and the last, comes from water. Also, water produces oxygen as well as reduces NADP to NADPH (required in the Calvin cycle) by liberating H+ ions. The process During photosynthesis, plants take in carbon dioxide (CO 2) and water (H 2 O) from the air and soil. The role of water is to release oxygen (O) from the water molecule into the atmosphere in the form of oxygen gas (O2). Plants perform this energy conversion using light, water, carbon dioxide and a green substance called chlorophyll. Remember, the electrons lost from the reaction center in photosystem II must be replaced. The sun starts the first reaction in photosynthesis, which is known as the light-dependent process. Where do the electrons from the primary electron receptor in PS II go? In the process of photosynthesis, water provides the electron that binds the hydrogen atom (of a water molecule) to the carbon (of carbon dioxide) to give sugar (glucose). Chemical energy is stored in the form of carbohydrate molecules. It enters leaves through the stomata . The carbon dioxide required for photosynthesis comes from the air. Photosynthesis is an energy-requiring process occurring only in green plants, algae, and certain bacteria that utilizes carbon dioxide and water to produce food in the form of carbohydrates. A hungry rabbit comes along and decides to eat some of the plant, which provides the energy that allows the rabbit to hop back to its home. Photosynthesis is the process used by plants to convert light energy into chemical energy. This water-oxidising or oxygen-evolving complex undergoes a complicated cycle that releases electrons and protons, hence ultimately hy… why is Net cash provided from investing activities is preferred to net cash used? Expert Answer . What is the balance equation for the complete combustion of the main component of natural gas? With the help of carbon dioxide and water, the pea pod used the energy from sunlight to construct the sugar molecules. When did organ music become associated with baseball? Describe how two photosystems work together in photosynthesis. The second stage of photosynthesis is the production of food, or glucose, a type of sugar made from hydrogen, carbon and oxygen. Photosynthesis takes place in a plant's leaves. Photosynthesis takes place in a plant's leaves. After the absorption, the water molecules are disassembled and converted into sugar and oxygen. 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