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Photosynthesis A.Photosynthesis occurs in chloroplasts (organelles inside plants and algae)

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Presentation on theme: "Photosynthesis A.Photosynthesis occurs in chloroplasts (organelles inside plants and algae)"— Presentation transcript:

1 Photosynthesis A.Photosynthesis occurs in chloroplasts (organelles inside plants and algae)

2 Overview of Photosynthesis B.Overview of Photosynthesis 1. Uses light as the source of energy 2. Uses water and carbon dioxide as reactants 3. Makes glucose (C 6 H 12 O 6 )

3 Photosynthesis 4. Gives off oxygen as a by-product 5. Equation: 6CO 2 + 6H 2 0 C 6 H 12 O 6 + 6O 2 6. Chlorophyll is the catalyst

4 Light Dependent Reaction Occurs in the thylakoids Energy from the sun used to break apart a water molecule Light Independent Reaction (Calvin Cycle) Occurs in the Stroma “Carbon Fixation”- breaks apart carbon molecules to use the carbon atoms to assemble glucose

5 Food Stores Chemical Energy

6 Harvesting The Energy In Food Many organisms harvest the energy stored in foods through cellular respiration. Cellular Respiration: Is a chemical process that uses oxygen to convert the chemical energy stored in glucose into another form of chemical energy called ATP. ATP: is the cells main energy supply.

7 Photosynthesis and cellular respiration are a cycle. There is a common set of chemicals. 1.Water 2.Carbon Dioxide 3.Oxygen 4.Glucose

8 Cellular respiration converts the energy in food  to energy in ATP. Relationship of cellular respiration to breathing. Aerobic: means “Require Oxygen”. Cellular respiration: the cell exchanges 2 gases. Takes in Oxygen  Releases carbon dioxide. Breathing is the following process. Blood stream delivers oxygen to cells. Blood stream takes away carbon dioxide from cells. This takes place in tiny air sacs in the lungs. Oxygen diffuses across the lungs lining into the blood stream. Carbon dioxide diffuses from blood stream to lungs and is exhaled.



11 In a molecule of ATP the “tail” is where the energy is stored (potential energy) Analogy: a tightly coiled spring No, nothing like this… The bond between two phosphate groups is broken and energy is released

12 Introduction to Energy Energy: is the ability to do work. Energy cannot be created nor destroyed. Can be converted from one kind to another. Work: is whenever an object is moved against an apposing force.

13 4 Types of Energy 1. Kinetic Energy: energy of motion. Any thing that is moving. 2. Potential Energy: is energy that is stored.

14 3. Chemical Energy: form of potential energy. There is a potential to form work. Chemical energy depends on the bonds & structure of molecules. 4. Thermal Energy: random molecular motion. Warmer objects > Cooler ones.

15 Putting Chemical Energy To Work Within your cells Glucose (organic molecules) react with oxygen, this process ( cellular respiration ) then exhausts Carbon dioxide, water and heat. 40% of food is used for energy. 60% is thermal energy. This helps us maintain our body temperature.

16 Why do our bodies create heat after exercising? There is an increase in cellular respiration. Calories: Units of energy. Is the amount of energy required to raise the temperature of 1 gram of water by 1 degree C. Kilocalories: 1,000 calories. 1 KiloCalorie = 1 Food Calorie


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