Based on the information provided, it can be concluded that the food molecules in plants cannot come directly from the Hydroponic Plant Food (HPF). HPF is a nutrient solution used to provide essential minerals and nutrients to plants grown in hydroponic systems. While HPF contains a variety of minerals and nutrients, it does not contain the complex organic molecules that make up food molecules such as carbohydrates, proteins, and lipids. Therefore, the food molecules in plants must be synthesized through the process of photosynthesis, where plants convert sunlight, carbon dioxide, and water into organic molecules.