Presentation on theme: "Photosynthesis and Cellular Respiration. Two ways to get food troph = food Autotrophs – Auto = self – Autotrophs make their own food Heterotrophs – Hetero."— Presentation transcript:
Photosynthesis and Cellular Respiration
Two ways to get food troph = food Autotrophs – Auto = self – Autotrophs make their own food Heterotrophs – Hetero = different – Heterotrophs get their food from something else (they have to eat it)
Two ways to get food Autotrophs – Plants Heterotrophs – Animals
Converts the suns energy into chemical energy stored in sugar Takes place in specialized structures inside plant cells called chloroplasts – Chlorophyll is the pigment that absorbs sunlight.
Photosynthesis Reaction 6CO H 2 O + light energy C 6 H 12 O 6 + 6O 2 The food plants make is called glucose (sugar)
Photosynthesis 2 different reactions – Light Reactions Capture light energy for photosynthesis – Calvin Cycle Produces glucose sugar
Cellular Respiration Cells Breathing
Cellular Respiration Happens in both plant and animal cells Overall Reaction: – C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O
Cellular Respiration Overview Depends on whether or not there is oxygen Aero = oxygen Aerobic Respiration – makes energy Anaerobic Respiration – Fermentation (makes alcohol)
Step 1: Glycolysis The energy that cells make and use is called ATP – Adenosine triphosphate Glycolysis makes 2 molecules of ATP (energy) Glycolysis happens in the cytoplasm of the cell
Step 2: Check for Oxygen If oxygen is present, the cell can make more ATP If no oxygen is present, the cell has to recycle the pieces from glycolysis and makes alcohol.
Step 3 with oxygen: Cellular Respiration Oxygen required=aerobic 2 more sets of reactions which occur the cells mitochondria – 1. Krebs Cycle – makes 2 ATP Also called the Citric Acid Cycle – 2. Electron Transport Chain – makes ATP
Krebs Cycle (Citric Acid Cycle)
Step 3 without oxygen: Fermentation The cell must recycle the materials from glycolysis. This recycling process is called fermentation. The product of fermentation is alcohol.
Energy Tally 36 ATP for aerobic vs. 2 ATP for anaerobic – Glycolysis 2 ATP – Krebs 2 ATP – Electron Transport32 ATP 36 ATP Anaerobic organisms cant be too energetic but are important for global recycling of carbon