Energy for photosynthesis in crops is provided by the sun. Photosynthesis is the process by which plants use energy from sunlight, carbon dioxide, and water to produce glucose and oxygen. The process of photosynthesis occurs in specialized structures in plant cells called chloroplasts, which contain chlorophyll pigments that absorb light energy from the sun. This light energy is then used to convert carbon dioxide and water into glucose and oxygen, which the plant uses as a source of energy for growth and development. Therefore, the energy for photosynthesis in crops is provided by the sun.