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Photosynthesis & Respiration. How do living things get all of the food and energy that they need to survive?

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Presentation on theme: "Photosynthesis & Respiration. How do living things get all of the food and energy that they need to survive?"— Presentation transcript:

1 Photosynthesis & Respiration

2 How do living things get all of the food and energy that they need to survive?

3 Photosynthesis and Cellular Respiration All energy comes from the breaking of chemical bonds in our food via a process called cellular respiration Plants make their own food via a process called photosynthesis

4 First Things First Before we have a look at these processes, let’s first have a closer look at how substances enter and leave a cell……..

5 How do the molecules required for cellular processes get into the cells in the first place?

6 Diffusion The movement of substances from areas of high concentrations to areas of low concentration until equilibrium is achieved.


8 What is Photosynthesis? The process of photosynthesis is a chemical reaction. It is the most important chemical reaction on our planet.

9 What is the equation for the chemical reaction of photosynthesis?

10 Six molecules of carbon dioxide react with six molecules of water to form 1 molecule of glucose and six molecules of oxygen.

11 Describe Photosynthesis The process of changing light energy to chemical energy Energy stored as sugar Occurs in plants and some algae Plants need light energy, CO 2, and H 2 O Takes place in the chloroplasts, using chlorophyll, the green pigment in plantschloroplasts chlorophyll

12 What happens during photosynthesis? Plants capture light energy and use that energy to make glucose Sunlight provides the energy needed by chlorophyll to change molecules of carbon dioxide and water into glucose Oxygen is also released in this reaction

13 What happens during photosynthesis? Carbon dioxide enters the leaf through holes called stomatastomata CO 2 combines with the stored energy in the chloroplasts through a chemical reaction to make glucose The sugar is moved through tubes in the leaf to the roots, stems and fruits of the plants Some of the sugar is used right away by the plant for energy; some is stored as starch; and some is built into plant tissue

14 Why is this important to us? We cannot make our own food (glucose, energy), we must get our food from plants. Plants are the first step in the food chain.

15 Why is this important to us? The oxygen released during photosynthesis is necessary for all living things.

16 Learn more about photosynthesis at:

17 What is Cellular Respiration?

18 The release of chemical energy for use by cells.

19 What is Cellular Respiration? Once the energy that was in sunlight is changed into chemical energy by photosynthesis, an organism has to transform the chemical energy into a a form that can be used by the organism. photosynthesis This process is cellular respiration.

20 Describe Cellular Respiration The breakdown of glucose molecules to release energy Takes place in all living things Is a step by step process

21 What is the chemical equation for cellular respiration?

22 Read how photosynthesis & respiration are related: er00/8th/energy/sciber/photosyn.htm

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