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Understanding Photosynthesis and Cellular Respiration

Learn about the processes of photosynthesis and cellular respiration in plants, the relationship between them, and the stages of cellular respiration. Explore how sunlight powers glucose production and how mitochondria produce ATP. Understand the significance of oxygen and carbon dioxide in these vital biological processes.

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Understanding Photosynthesis and Cellular Respiration

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  1. Photosynthesis and Cellular Respiration Chap.6&7

  2. Final points on photosynthesis • It is done by autotrophs. (plants) • It starts with light reactions that occur in photosystem one and two in which sunlight is captured, absorbed, synthesized into ATP through the process of chemiosis. (chloroplast) • Then the Calvin cycle fixates carbon. ( breaks CO2 apart so it can be made into sugar) • At night, plants break down the stored sugar for energy by cellular respiration. (mitochondria)

  3. Relationship between photosynthesis and Cellular Respiration • cellular respiration is essentially the reverse reaction of photosynthesis. • The formula for photosynthesis is 6 H2O + 6 CO2 + light energy ----------> C6 H12 O6 + 6 O2 and the formula for cellular respiration is C6 H12 O6 + 6 02 ----------> 6 H2O+ 6 CO2+ energy • From the formulas here, you can see that the products of photosynthesis fuel cellular respiration and the products of cellular respiration fuel photosynthesis. • Photosynthesis uses energy from sunlight to build glucose and release oxygen from carbon dioxide and water. Cellular respiration combines oxygen with glucose in the mitochondria to produce ATP; water (along with a little heat) and carbon dioxide are produced as well. • (wikipedia.com)

  4. Cellular Respiration • Done by autotrophs and heterotrophs. • Makes ATP. Some ATP is used by the cell to function. • Is a continuous cycle in heterotrophs but happens only at night in autotrophs.

  5. Stages of Cellular Respiration • Begins with glycolysis (breaking down of glucose into smaller carbon chains) in the cytoplasm of a cell. -

  6. Anaerobic Respiration • If no O2 is present then two types of fermentation can occur: Lactic Acid fermentation (animal cells) Alcoholic fermentation (yeast and plant cells)

  7. Lactic Acid Fermentation • Causes muscle soreness or cramps.

  8. Alcoholic Fermentation • No O2 is used to make this:

  9. Krebs Cycle

  10. Aerobic Respiration • - If O2 is present - Aerobic respiration takes place during the Krebs cycle. This is done in the “power house” of the cell known as the mitochondrion.

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