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Photosynthesis and Cellular Respiration. Two ways to get food troph = food Autotrophs – Auto = self – Autotrophs make their own food Heterotrophs – Hetero.

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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:

1 Photosynthesis and Cellular Respiration

2 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)

3 Two ways to get food Autotrophs – Plants Heterotrophs – Animals

4 Photosynthesis

5 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.

6 Photosynthesis Reaction 6CO H 2 O + light energy C 6 H 12 O 6 + 6O 2 The food plants make is called glucose (sugar)

7 Photosynthesis 2 different reactions – Light Reactions Capture light energy for photosynthesis – Calvin Cycle Produces glucose sugar

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10 Cellular Respiration Cells Breathing

11 Cellular Respiration Happens in both plant and animal cells Overall Reaction: – C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O

12 Cellular Respiration Overview Depends on whether or not there is oxygen Aero = oxygen Aerobic Respiration – makes energy Anaerobic Respiration – Fermentation (makes alcohol)

13 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

14 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.

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16 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

17 Krebs Cycle (Citric Acid Cycle)

18 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.

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20 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

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