Cellular Respiration
* Purpose: To break down glucose (sugar) in the presence of oxygen to release energy in the form of ATP (adenosine triphosphate).
* Inputs: Glucose (C6H12O6) and oxygen (O2)
* Outputs: Carbon dioxide (CO2), water (H2O), and ATP
* Location: Mitochondria (organelles within cells)
* Organisms: All living organisms, including plants, animals, fungi, and bacteria
* Energy Flow: Converts chemical energy stored in glucose into a usable form of energy (ATP)
* Summary Equation: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy (ATP)
Photosynthesis
* Purpose: To convert light energy from the sun into chemical energy in the form of glucose.
* Inputs: Carbon dioxide (CO2), water (H2O), and sunlight
* Outputs: Glucose (C6H12O6) and oxygen (O2)
* Location: Chloroplasts (organelles within plant cells)
* Organisms: Plants, algae, and some bacteria
* Energy Flow: Converts light energy into chemical energy stored in glucose
* Summary Equation: 6CO2 + 6H2O + Light Energy → C6H12O6 + 6O2
Key Differences:
* Energy Source: Cellular respiration uses chemical energy from glucose, while photosynthesis uses light energy.
* Reactants and Products: The reactants and products of the two processes are reversed.
* Location: Cellular respiration occurs in mitochondria, while photosynthesis occurs in chloroplasts.
* Organisms: All living organisms perform cellular respiration, while only photosynthetic organisms perform photosynthesis.
Connection: Photosynthesis produces glucose and oxygen that are used as inputs in cellular respiration. Cellular respiration produces carbon dioxide and water that are used as inputs in photosynthesis. This cycle forms the basis of energy flow and matter cycling in ecosystems.
