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What is Photosynthesis?

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Emily Pan

on 4 November 2013

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Transcript of What is Photosynthesis?

What is Photosynthesis?
Trees/Plants
Plants are autotrophs, things that can make their own food. Plants are also called producers. As they make their food, plants take in light, water (H2O), and carbon dioxide (CO2). The plants can then use these things to make oxygen and glucose.
Sun
Light energy travels in waves, which are movements across the air that we cannot see. It is made of seven colors:
About the Author
Emily Pan is a 14 year-old student who attends Eleanor Roosevelt High School. She currently resides in Eastvale, California. A few of her interests are playing table tennis, cooking, playing on the computer, and sleeping. She loves to eat seafood, sashimi, sushi, and noodles. Her favorite color is red, and she enjoys taking naps. When Emily grows up, she wants to be an optometrist because she would like to have 20/20 vision. Emily's favorite subject in school is science.
Photosynthesis may seem like a big word, but it's actually pretty simple. Photosynthesis is how plants eat. Since plants only stay in one spot, they only need three things to eat: carbon dioxide, water, and light. With these three things, plants can make oxygen and glucose, which is what the plant needs to stay alive.
Introduction
This is what it looks like:
Word Form: carbon dioxide + water --> oxygen and glucose
Balanced Chemical Equation: 6CO2 + 6H20 --> 6O2 + C6H1206
By: Emily Pan, P4 Biology H
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Individual Leaf
Chloroplasts are the food makers in plants. They can be found in plant cells in the leaves of the plants.
Have you ever wondered why plants are green? It's because chlorophyll, a colored pigment in chloroplasts, makes the leaves green! With chlorophyll, the plants can trap the energy in sunlight.
Light-Dependent Reaction
The light-dependent reaction takes place in the thylakoids. First, it begins with water(H20) and sunlight. These two things can make ATP and NADPH energy. During this step, plants let oxygen(O2) out as a waste product.
Light-Independent Reaction
The light-independent reaction takes place in the stroma of the chloroplast. The plant uses carbon dioxide (CO2) and ATP & NADPH energy make in the light-dependent reaction to make food. These three things can make plant food: glucose (C6H12O6), also known as sugar.
What Affects Photosynthesis?
Carbon dioxide, water, temperature, and light intensity all have a great effect on photosynthesis. Do you remember that a plant needs all of these things to go through photosynthesis? If one of these things were gone, the plant would not be able to go through photosynthesis.
What Happens to Glucose?
The Importance of Photosynthesis
Plants can do many things with their food for themselves (glucose):
break apart in mitochondria to make lots of ATP energy
link together to make up the plant's body
eaten by other things and used as energy
Have you ever wondered why photosynthesis is important? Photosynthesis is important for all living things, not just plants! Think about a world without plants. The first problem would be no oxygen. How would we breathe? Without photosynthesis, there would be no life.
Too much light = plant dies
Temperature too high/low = plant dies
More carbon dioxide = photosynthesis rate goes up
Water too much/little = plant dies
Summary
To conclude, photosynthesis is when plants capture energy from the sun to make their own food. During this process, plants use carbon dioxide and water to make glucose. Oxygen is also released as a waste product. The goal of photosynthesis is to produce glucose, which is sugar. Finally, there are two parts to photosynthesis: the light-dependent reaction and the light-independent reaction (the Calvin Cycle). Glucose can be broken apart in the mitochondria and used to make lots of ATP energy, linked together to make the plant's body, or eaten by other organisms to be used as energy. Clearly, photosynthesis is how plants make their food.
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