Photosynthesis is the way plants get energy. You and me eat food to get energy, but plants capture sunlight and use that to create energy. This creation of the energy from light is called photosynthesis. The plants combine carbon dioxide, water, and light to create energy. The carbon dioxide come from the air, the water comes from the ground where the plant's roots suck it up from the soil, and the light comes from the sun. The plant needs all three of these things to create energy through a chemical reaction that creates sugar and oxygen. The plants use the sugar for energy and the oxygen is released back into the air around the plants.

Photosynthesis is what makes our lives possible.

The source of almost all that energy is the sun. Puny animals like us can't use the sun's energy directly, we need plants to turn that energy into food. Photo (light) synthesis (making) basically means making food from the energy in the form of light.

So photosynthesis means plants taking gas CO₂ (carbon dioxide)from the atmosphere, and water (H₂O) to make make sugar (C₆H₁₂O₆) and re lease oxygen (O₂) as a by-product. In order to do this "food", the plants need energy, and this is the energy that comes from the light (photons). This light is captures by pigments in the plants, like chlorophyll ; the stuff that makes plants green.

How does water help? Well, in order to make food, the plants need both, gas CO₂ (carbon dioxide)from the atmosphere, and water (H₂O). Then water is a fundamental component to perform photosynthesis.

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The word "photosynthesis" has two parts to explain its meaning. The first part, "photo", means "light". The second part, "synthesis", means "the process of parts coming together". The word in its entirety means, in the context of biochemistry, "the process of things coming together as a result of the action of sunlight". To put it simply, the word "photosynthesis" describes the set of chemical reactions that allows plants, some algae, and some bacteria to use sunlight as energy to drive the making of important nutrients.

Water is required in photosynthesis as a reactant , which is a word that describes things that are required at the start of a chemical reaction. The entire process of photosynthesis uses water and carbon dioxide to make sugar and oxygen. Sugar is something plants need to store energy, so photosynthesis is very important.

All living things need energy to grow. Humans get energy from the food that we eat, but plants get energy directly from the sun. Plants do this by using the energy from the sun to build sugar molecules that the plant uses for energy or stores for later. The process by which a plant uses energy from the sun to build sugar molecules is called photosynthesis (“Photo” comes from the Greek word for “light” and “synthesis” means “putting together”).

Sugars are mostly made of carbon and hydrogen atoms. The carbon for building the sugars comes from carbon dioxide (CO₂) that plants absorb from the air. The hydrogen comes from water (H₂O).

A plant’s leaves work like solar panels that you might see on the roof of people’s houses. The absorbed light is used to remove an electron off of a pigment molecule in the plant’s leaves. In a solar panel, these electrons are used to generate an electric current that supplies electricity to the house. In plants this electron is used to split a water molecule into hydrogen and oxygen. The oxygen is release into the atmosphere and the hydrogen is eventually used to build the sugar molecules.