Photosynthesis Explained with Simple Animations

The light reaction of photosynthesis occurs in the chloroplasts of plant leaves.Chloroplasts contain specialized structures called thylakoids, which are stacked into grana.When sunlight strikes the leaf, it is captured by chlorophyll molecules in the thylakoids.Water molecules enter the chloroplast and are split into hydrogen and oxygen.The energy from sunlight is used to power electron transport chains in the thylakoid membrane.This process produces two crucial energy carriers: ATP and NADPH.These energy carriers will be used in the next phase of photosynthesis, the Calvin cycle.Carbon dioxide enters the leaf through specialized pores called stomata.The Calvin cycle begins with ATP and NADPH from the light reaction.Through a series of chemical reactions, carbon dioxide is combined with other molecules in a process that doesn't require direct sunlight.Finally, these reactions produce glucose, which will serve as the plant's primary food source.This process is called the dark reaction because it doesn't require direct sunlight to occur.The glucose produced through photosynthesis serves multiple purposes in the plant.Some glucose is used immediately for energy to power essential cell functions.Excess glucose is converted to starch for long-term storage.This conversion process involves linking multiple glucose molecules together to form starch, releasing water as a byproduct.Plants store this energy in various parts: roots, stems, and leaves.This stored energy is crucial for plant survival during periods without sunlight.Throughout this process, oxygen is released as a byproduct, which is essential for most life on Earth.