Energy Flow in Ecosystems Organisms interact with the ecosystem by: Obtaining food from the ecosystem Contributing energy to the ecosystem

CO2 + H2O + sunlight  C6H12O6 + O2 Photosynthesis CO2 + H2O + sunlight  C6H12O6 + O2 Carbon dioxide and water react with sunlight to produce glucose and oxygen used to capture & store energy occurs in the chloroplasts only plants, some protists, & some bacteria do this.

Cellular respiration C6H12O6 + O2  CO2 + H2O + energy Glucose and oxygen react to form carbon dioxide, water and release energy used to release energy for use occurs in the mitochondria All living things need to do this

PHOTOSYNTHESIS CELLULAR RESPIRATION Definition: Process by which autotrophs capture energy & store it as carbohydrates Process by which autotrophs & heterotrophs obtain energy through the breakdown of stored or ingested carbohydrates Chemical equation: 6H2O + 6CO2 + ENERGY  C6H12O6 + 6O2 C6H12O6 + 6O2 Requires: (Reactants) Carbon dioxide, water, & energy Glucose & oxygen Produces: (Products) Takes place in: Plant, some protists, & some bacterial cells All aerobic organisms Organelle: Chloroplast (contains chlorophyll to absorb sun’s energy) Mitochondria