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Understanding Photosynthesis: The Plant Energy Process

Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into energy in the form of ATP, glucose, and oxygen. It’s essentially the reverse of cellular respiration in animals, which uses glucose and oxygen to produce energy, water, and carbon dioxide. Plants capture sunlight with chlorophyll within chloroplasts, enabling them to split water and produce glucose and oxygen. This interdependent relationship highlights how plants provide essential oxygen and food for animals, while animals produce carbon dioxide and water for plants.

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Understanding Photosynthesis: The Plant Energy Process

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  1. Photosynthesis Energy from sunlight….food and air for us

  2. Photosynthesis is cellular respiration in reverse for plants • In animals, we use GLUCOSE and OXYGEN to create energy. • The mitochondria (power plant) converts these into cellular electricity • ATP! • In animals, the waste products produced are CO2 and H20 • PHOTOSYNTHESIS is the exact opposite!!!!!!!! Let’s think some more about this…

  3. What does a plant need? • SUNLIGHT (or….grow light) • Water • And…CO2 (what plants breathe in) • So, plants use SUNLIGHT, WATER, and CO2 to create energy • ATP, just like in humans

  4. What do plants produce as waste products? • Hint: Plants make just what humans need for cellular respiration Remember, humans need Oxygen and GLUCOSE... And, that is exactly what plants produce as waste after they’ve made their ATP! Plants produce OXYGEN and GLUCOSE (as fruit, or in their bodies for us to eat!)

  5. Finally, HYDROLYSIS • Hydro = water • Lysis = splitting • Hydrolysis = water splitting • Just like cellular respiration involves GLYCOLYSIS (sugar splitting) as the first step of the process, the first step of photosynthesis is to split WATER into parts.

  6. So, Cell Respiration and Photosynthesis work together • Plants: • Sunlight + CO2 + H20  ENERGY (ATP) + Glucose + O2 • Animals: • O2 + Glucose  ENERGY (ATP) + CO2 + H2O • Plants waste products are our FOOD and AIR (O2) • Our waste products are plants’ WATER and AIR (CO2)

  7. Glucose O2 Chloroplast Mitochondria CO2 and H2O ATP

  8. How do plants capture energy from the sun?They must contain: • Chlorophyll – a green pigment that can capture light energy • Chlorophyll is found in the chloroplasts, organelles in plant cells

  9. Chloroplast – organelle in green plant cells

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