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Photosynthesis PowerPoint PPT Presentation

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Photosynthesis. Elodea Experiment. In this experiment we will explore what is known as plant pearling, a process that occurs in aquatic plant species as a result of photosynthesis.

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Elodea experiment

Elodea Experiment

  • In this experiment we will explore what is known as plant pearling, a process that occurs in aquatic plant species as a result of photosynthesis.

  • Plant pearling is when bubbles of oxygen accumulate on the leaves of plants and sometimes float to the top of the aquarium like in a glass of campaign.

  • It’s a sign that you have a healthy environment in your aquarium.

Elodea experiment1

Elodea Experiment


  • Elodea Experiment



  • Photosynthesis is the process by which a cell captures energy and uses it to make food.

  • Almost all living things obtain energy either directly or indirectly from the energy of sunlight that is captured during photosynthesis.



  • Plants make their own food through the process of photosynthesis.

  • An organism that makes its own food is called an autotroph.






  • An organism that cannot make its own food is called a heterotroph.

  • Many heterotrophs obtain food by eating other organisms.



  • During photosynthesis, plants and some other organisms absorb energy from the sun and use the energy to convert carbon dioxide and water into sugars and oxygen.



  • Photosynthesis occurs mostly in the leaves of plants where the chloroplasts, green organelles in plant cells are.

  • Chlorophyll is a pigment in chloroplasts that is responsible for photosynthesis.



  • During stage 1, water in the chloroplasts is split into hydrogen and oxygen.

  • The oxygen is given off as a waste product as seen in aquatic plants undergoing the process of pearling.

  • The oxygen exits the leaf through openings on its underside.



  • During Stage 2 of photosynthesis cells use the hydrogen that was split off from the water, energy from the sun, and the carbon dioxide from the air to produce sugars.

  • Some of these sugars are used to give plants energy while others are stored.

Cellular respiration

Cellular Respiration

  • During cellular respiration, cells break down glucose and other molecules from food in the presence of oxygen to release energy.

  • Breathing removes the waste product of cellular respiration (carbon dioxide) from your body.

Cellular respiration1

Cellular Respiration

  • During the first stage of cellular respiration the molecule of glucose (the sugar) is broken down in the cytoplasm of the cell.

  • Then, in the second stage, oxygen is used to break down molecules even more to produce energy.

  • The second stage of cellular respiration occurs in the mitochondria, the powerhouse of the cell.

Powering the cell mitochondria

Powering the Cell: Mitochondria

  • This is what it looks like inside of your cell as cellular respiration is occurring right now.


Comparing cellular respiration and photosynthesis

Comparing Cellular Respiration and Photosynthesis



  • Some organisms can live in the absence of oxygen through a process called fermentation.

  • Fermentation is an process in which cells release energy from food without using oxygen.

  • Making cheese is a process that uses fermentation




  • Alcoholic fermentation is a type of fermentation that occurs in yeast and other single-celled organisms.

  • It produces alcohol, carbon dioxide and some energy.

  • Bakers and brewers use yeast to make bread rise and drinks sparkle.



  • What evidence can you see of a product of alcoholic fermentation in this picture?



  • Lactic Acid Fermentation occurs in your muscles when you exercise when your muscle cells use oxygen faster than it can be replaced.

  • A product of this type of fermentation is lactic acid.



  • When lactic acid builds up in your muscles, your muscles feel weak and sore.

  • Later, when your cells get more oxygen, the lactic acid will break down and the pain will go away.

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