What is Photosynthesis


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A powerpoint on the lesson about Photosynthesis (High School lesson)


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Presentation Transcript


PHOTOSYNTHESIS Plants are the only things on earth that turn sunlight into food. They do it through a process called photosynthesis


PHOTOSYNTHESIS Photosynthesis means to "put together using light". Plants use sunlight to turn carbon dioxide from the air, and water into food. Plants need these to live. When the plant get these things, it makes a simple sugar, which it uses immediately or stores in a form of starch. Chlorophyll, the green substance in plants, helps it to happen.

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WHAT MAKES A PLANT? What do they all have in common? The big thing that connects plants is photosynthesis. Photosynthesis is the process that allows plants to take energy from the Sun and create sugars. Not all plants go through the process of photosynthesis.

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Plants are able to turn sunlight into energy but not directly. Plants are actually able to store energy in some chemical bonds that can be used later. Before we get into details, we'll explain that there are two processes on Earth: Photosynthesis and respiration. Photosynthesis stores the energy and respiration releases that energy. It all starts with the Sun


PHOTOSYNTHESIS -PART I: THE SUN AND LIGHT Not all of the light from the Sun makes it to the surface of the Earth. The little light that does make it here is enough for the plants of the world to survive and go through the process of photosynthesis. Light is actually energy. When that energy gets to a green plant, all sorts of reactions can take place to store energy in the form of sugar molecules.


PART II: THE CHLOROPLAST We already spoke about the chloroplasts in the plants cells. Photosynthesis happens in the chloroplast. Within the chloroplasts the chlorophyll captures the light from the Sun. We'll talk about it in a bit, but the chloroplasts are working night and day with different jobs. The molecules are moved and converted in the area called the stroma.


PART III: THE MOLECULES Chlorophyll is the magic compound that can grab that sunlight and start the whole process. Chlorophyll can be found in many microorganisms and even some prokaryotic cells. However, for plants, the chlorophyll is found in the chloroplasts. The other big molecules are water (H2O), carbon dioxide (CO2), oxygen (O2) and glucose (C6H12O6). Carbon dioxide and water combine with light to create oxygen and glucose. That glucose is used in various forms by every creature on the planet. Animal cells require oxygen to survive. Animal cells need an aerobic environment (one with oxygen).


PART IV: LIGHT AND DARK REACTIONS The whole process doesn't happen all at one time. The process of photosynthesis is divided into two main parts. The first part is called the light dependent reaction. This reaction happens when the light energy is captured and pushed into a chemical called ATP. The second part of the process happens when the ATP is used to make glucose (the Calvin Cycle). That second part is called the light independent reaction.

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water sunlight carbon dioxide oxygen Sugar to starch

What do plants need to carry out photosynthesis? : 

What do plants need to carry out photosynthesis? Sunlight Carbon dioxide Water *chlorophyll- as the substance that grabs sunlight to start the whole process.

How Do Primary Producers Make Their Own Food? : 

How Do Primary Producers Make Their Own Food? Primary producers like plants make their own food by doing something called photosynthesis. How does photosynthesis work? Leaves of plants absorb light from the sun. Leaves of plants also absorb the air that people breathe out, called carbon dioxide. Leaves of plants also absorb water. They can get water from falling rain or they can get it out of the ground with their roots. Leaves of plants use light from the sun to turn the air people breathe out and water into glucose and oxygen. Glucose is a type of sugar that plants use for food help them grow. Oxygen is the gas that people breathe in. So not only do plants make their own food, but they make the air that we breathe in! In other words, photosynthesis is:sunlight + air people breath out + water = plant food + air people breathe in

Homework: : 

Homework: Prepare and bring the following: 1 small bottle of iodine solution In small pieces 2 inches size: Wood Paper 8. medicine dropper Cloth 9. cuts of potatoes Fruit or leaves Plastic

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