Explain in detail the basic difference between (a)photosynthesis versus (b) aerobic chemosynthesis, and versus (c) anaerobic chemosynthesis. In your answer, provide a brief example of the circumstances under which each of these mechanism would generally occur.
Answer. Photosynthesis is a process in which plants use light energy to combine carbon dioxide with water. The reaction produces sugar (glucose), which is utilized by the plants for their survival. They have pigment for trapping solar energy. Common examples are plants, algae.
CO2+ H2O --> C6H12O6 + H2O+O2
Aerobic Chemosynthesis is a process in which organism take energy from the oxidation of inorganic compounds, such as H2S. The energy taken is used to react carbon dioxide with water, to make sugar. Examples are hydrothermal vent bacteria oxidised H2S, CO2 and O2. reaction is CO2 + 4H2S + O2 -> C6H12O6 + H2O + 4S .
Anaerobic Chemosynthesis is a process by which organism make their food by using inorganic compounds fpr making energy. Such as CO2 and H2 is used to make CH4 examples are Methanogen which uses only CO2 and H2 reaction is CO2 + 4 H2 ? CH4 + 2H2O
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