Final answer:
Glucose is the main product of photosynthesis and the chief source of energy for most organisms. It is converted into ATP during cellular respiration, providing energy for cells, while oxygen is released as a by-product.
Step-by-step explanation:
The product of photosynthesis that is the chief source of energy for most organisms is glucose. During photosynthesis, plants use sunlight to convert water and carbon dioxide into glucose and oxygen. Glucose serves as a fundamental energy source for cells through a process called cellular respiration, where it is converted into the energy-carrying molecule ATP (adenosine triphosphate). While glucose is the primary energy source for cells, oxygen, though a by-product, is crucial for animal life and is released into the atmosphere.
The chief source of energy for most organisms is glucose, which is a product of photosynthesis. Glucose is a sugar that acts as the "food" source for plants and can be converted into usable chemical energy, ATP, during cellular respiration. The oxygen formed during photosynthesis, which is necessary for animal life, is essentially a waste product of the photosynthesis process.