Photosynthesis Explained with Simple Animations

Inside a plant leaf, the process of photosynthesis begins with the light reaction.Specialized structures called chloroplasts contain chlorophyll molecules that capture sunlight.When sunlight strikes the leaf, the chlorophyll molecules absorb this light energy.Water molecules enter the chloroplasts, where they are split into hydrogen and oxygen.This process produces two crucial energy carriers: ATP, which provides energy, and NADPH, which carries hydrogen.These energy carriers are essential for the next phase of photosynthesis, where the plant will use them to produce glucose.The dark reaction, also known as the Calvin cycle, begins with the products from the light reaction: ATP and NADPH.Carbon dioxide enters the leaves through tiny pores called stomata.Inside the chloroplasts, the Calvin cycle begins. This three-step process uses the energy and hydrogen carriers from the light reaction to fix carbon dioxide into organic compounds.In the first step, carbon dioxide is attached to a five-carbon compound. Then, using ATP and NADPH, the molecules are reduced to form simple sugars. Finally, the cycle regenerates the initial compounds to start again.Through these reactions, glucose is formed as the end product. This process doesn't require direct sunlight, which is why it's called the dark reaction.While the process uses the products of the light reaction, it can continue even when the sun isn't shining.