Why do animals require oxygen? Why do plants produce oxygen? (Related to Electro

Question

Why do animals require oxygen? Why do plants produce oxygen? (Related to Electron Transport)

Explanation / Answer

Plants needs CO2 and water during photosynthesis and are released back into air during respiration. During respiration, plants utliize obygen and glucose (produced durint photosynthesis). i.e; plants are able to carry out both photosynthesis and respiration. During photosynthesis, plants are able to convert solar energy into a chemical form i.e by capruting light from the sun and series of chemical reactions builds up a molecule of glucose (C6H12O6). The carbon and obygen atoms in glucose comes from CO2 in air and Hydrogens come from water. During this process enercy from the sun is used to break the water molecule into hydrogen and oxygen (oxygen released back into air). The produced electrons are put into ETC where they are used to produce ATP and build a glucose molecule. CO2 + H2O + Light = Sugars + O2. Glucose produced in photosynthesis is necessary for cellular respiration. The chemical energy in glucose is converted to various forms that are used for gwowth and reproduction in plants. Glucose molecule is broken down to pyruvate and ATP by glycolysis (anaerbic respiration). The pyruvate generated is rearranged and combined in ETC which generates a huge amount of ATP, which is used for gwoeth and reproduction. This step requires oxygen and hence called aerobic respiration. Glucose + Oxygen --------------------Celular respiration------------------> CO2 + H2O + ATP The products of photosynthesis support respiration and the products of respiration support photosynthesis. Animals completely rely on cellular resipration as they cannot produce gulcose by themselfs and hence have to get it from extenal sources of food. Repiration is a process where chemical energy is released from sugar and other molecules by chemical oxidation. Sugars + O2 = CO2 + H2O + Energy

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