Plants store energy primarily in the form of chemical energy through the process of photosynthesis. Here’s how it works and where the energy is stored:

1. Photosynthesis Process:
   • Plants capture sunlight using a pigment called chlorophyll, found in chloroplasts.
   • Using sunlight, they convert carbon dioxide (CO₂) from the air and water (H₂O) from the soil into glucose (C₆H₁₂O₆), a simple sugar, and release oxygen (O₂) as a byproduct.
2. Energy Storage in Glucose:
   • The glucose produced during photosynthesis acts as an immediate energy source.
   • When energy is needed, glucose undergoes cellular respiration to produce ATP (adenosine triphosphate), the usable energy currency of cells.
3. Conversion to Starch:
   • Excess glucose is converted into starch, a complex carbohydrate, for long-term storage. Starch is stored in:
     • Leaves
     • Roots (e.g., potatoes, carrots)
     • Stems
     • Seeds (e.g., rice, wheat, corn)
4. Oils and Fats:
   • In some plants (e.g., sunflower, soybean, and olive), glucose is converted into oils and fats for energy storage in seeds.
5. Cellulose:
   • Glucose is also used to synthesize cellulose, which is a structural component of the cell wall. While not used for energy storage, cellulose demonstrates how plants utilize the products of photosynthesis.

In summary, plants store energy in the form of starch and sometimes as oils and fats, ensuring they have reserves to fuel their growth, reproduction, and survival during unfavorable conditions.