Photosynthesis is the process by which plants manufacture their own food. It is a complex process that involves the absorption of light energy from the sun, the conversion of that energy into chemical energy, and the synthesis of organic compounds such as glucose. The process of photosynthesis occurs in the chloroplasts of plant cells.

The process of Photosynthesis can be explained in the following steps:

1. Absorption of Light Energy: Chlorophyll pigments present in chloroplasts absorb light energy from the sun.

2. Conversion of Light Energy to Chemical Energy: The absorbed light energy is converted to chemical energy and stored in the form of ATP (Adenosine Triphosphate).

3. Splitting of Water Molecules: Water molecules are split into hydrogen and oxygen by the process of photolysis. The oxygen is released into the atmosphere, while the hydrogen is used to produce energy.

4. Synthesis of Glucose: The energy produced is used to combine carbon dioxide from the air with the hydrogen from water to produce glucose.

5. Release of Oxygen: Oxygen is released into the atmosphere as a by-product of photosynthesis.

Thus, plants prepare glucose in the process of photosynthesis. Glucose is a simple sugar that is used by plants as a source of energy. It is also the building block for larger carbohydrates such as starch and cellulose. These carbohydrates are used by plants for growth and development.