our topic right now, namely photosynthesis,is arguably one of the most important chemical reactions occurring on theplanet. Let's see why.
Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch and stored. Oxygen is produced as a by-product.
Energy conversions starting with solar energy, photosynthesis, ..
In this experiment Ingenhousz demonstrated that plants are dependent on light and their green parts for nutrients and energy.
For more photosynthesis experiments look here:
The Discovery of Photosynthesis
You have asked a classic question in biology, and of course, a very important one. How living things produce usable energy is important not only from the perspective of understanding life, but it could also help us to design more efficient energy harvesting and producing products - if we could "mimic" how living cells deal with their energy balance, we might be able to vastly improve our technology. For example, a plant is a much better harvester of sunlight than even our best solar panel. And of course, if we understand energy use, it can also help us deal with human diseases such as diabetes.
Many chemicals are made to allow life processes to occur in plants
Photosynthesis captures energy for life on Earth. Many chemicals are made to allow life processes to occur in plants. These chemicals can move in and out of cells by the process of diffusion. Osmosis is a specific type of diffusion.
Energy - Royal Society of Chemistry
Animals that consume plants also make use of this energy, as do those that consume those that consume plants, and so on to the top of the food chain.
As important a job as making all of the world's food is, there's another vital function that photosynthesis performs: It generates the oxygen that oxygen-breathing animals need to survive.
What is photosynthesis? - eschooltoday
Photosynthesis is a process used by plants in which energy from sunlight is used to convert carbon dioxide and water into molecules needed for growth. These molecules include sugars, enzymes and chlorophyll.
The light-dependent reactions (article) | Khan Academy
Photosynthetic organisms use energy from sunlight to synthesize their own fuels. They can convert harvested sunlight into chemical energy (including ATP) to then drive the synthesis of carbohydrates from carbon dioxide and water. When they synthesize the carbohydrates, oxygen gets released. Globally, more than 10 billion tons of carbon is "fixed" by plants every year - this means that carbon molecules are converted from being part of a simple gas (carbon dioxide) into more complex, reduced molecules (carbohydrates), making carbon available as food for non-photosynthesizers (and of course, providing oxygen). They use some of the carbohydrate for their own growth and reproduction. It is pretty remarkable when you think about it - have you been to Sequoia National Park or seen the redwoods along our northwest coast? Massive trees, right? Think about the fact that most of that mass is in the form of carbon that was pulled out of the air as carbon dioxide!