How are photosynthesis and cellular respiration different?

Answer 1

Photosynthesis:

• occurs in plants and some bacteria.
• only occurs in the presence of sunlight/UV light
• occurs within the chloroplasts.
• requires chlorophyll
• uses water, light energy and carbon dioxide
• produces oxygen and glucose (which are the reactants of cellular respiration)
• captures light energy to store as chemical energy
• builds up the plant's energy stores
• chemical formula is 6CO2 + 6H2O (+ light energy) C6H12O6 + 6O2
• is an anabolic reaction, i.e. simple molecules are built up into complex ones
• occurs in two phases: the light and dark reactions
• uses NADP to carry hydrogen ions
• is an endothermic process
• results in the production of carbohydrates
• captures light energy and converts it to chemical energy
• energy is solar energy converted to chemical energy

Cellular Respiration

• occurs in plants and animals.
• occurs at all times in all living organisms
• occurs within the cytoplasm and mitochondria.
• does not require chlorophyll
• uses oxygen and glucose
• produces energy (in the form of ATP), carbon dioxide, and water (which are the reactants of photosynthesis)
• chemical formula is C6H12O6 + 6O2 --> 6CO2 + 6H2O + energy (ATP)
• is a catabolic reaction, i.e. complex molecules are broken down to simpler ones
• occurs in three phases: glycolysis, Krebs and the ETS
• uses NAD+ to carry hydrogen ions
• Is an exothermic process.
• Involves the use/consumption of carbohydrates
• takes the chemical energy resulting from photosynthesis and breaks it down, releasing energy
• energy is the stored chemical energy that originated from photosynthesis; this chemical energy is converted to other kinds of energy like heat and motion (energy required for cellular processes to occur.)