2 Objectives: Describe photosynthesis and cellular respiration. Compare cellular respiration with fermentation.
3 Photosynthesis The energy that fuels life comes from the sun. Photosynthesis: the process that plants and algae use to convert light energy into food energyThis food supplies energy for the plant as well as other organisms that eat the plant.Without plants (producers), consumers wouldn’t be able to live.
5 PhotosynthesisPigments: molecules in plants that absorb the energy from lightExample: chlorophyll is a pigment (in chloroplasts) that gives plants their green color
6 Photosynthesis 6CO2 + 6H2O + light energy C6H12O6 + 6O2 Carbon Water Glucose OxygenDioxide (Sugar)Plants use energy from sunlight to change carbon dioxide and water into glucose (food) and oxygen.
7 Cellular RespirationFood has to be broken down into energy that our cells can use.Respiration means “breathing”But cellular respiration is not the same thing as breathingCellular Respiration: the process of producing energy (ATP) from Oxygen and Glucose (food)ATP (Adenosine Triphosphate): energy molecule the cell can use
8 Cellular Respiration C6H12O6 + 6O2 6CO2 + 6H2O + energy (ATP) Glucose Oxygen Carbon WaterDioxideFood and oxygen are broken down into carbon dioxide, water and ATP.Most of the energy produced is in the form of heat.This helps to maintain body temperature.
9 Cellular Respiration in Eukaryotes Takes place in mitochondria
10 Photosynthesis vs. Cellular Respiration Reactants: light energy, carbon dioxide, and waterProducts: glucose and oxygenOccurs in plant cellsTakes place in chloroplasts.Reactants: glucose and oxygenProducts: energy (ATP and heat), carbon dioxide, and waterOccurs in both plant and animal cells.Takes place in mitochondria.
11 C6H12O6 → 2 C2H5OH + 2 CO2 sugar -> ethanol + carbonic gas FermentationTakes place when there isn’t enough oxygen to do cellular respiration.A small amount of ATP is made during fermentation.C6H12O6 → 2 C2H5OH + 2 CO2 sugar -> ethanol + carbonic gas
12 2 Types of Fermentation Type 1 Type 2 Occurs in muscle cells, some fungi, and some bacteria.Lactic acid & ATP is producedCauses muscle fatigue/ sore musclesOccurs in some bacteria and yeast.ATP, Carbon dioxide, & alcohol are produced.Carbon dioxide bubbles are what cause bread to rise.