Which of the following farm operations cannot be mechanized?

Seed germination is a farm operation that cannot be mechanized. Seed germination is a natural process that occurs when a seed is exposed to the right conditions of moisture, temperature, and air. It is a biological process that cannot be controlled by machinery or automated processes. While there are technologies and equipment that can help to create the optimal conditions for seed germination, such as seed drills, irrigation systems, and greenhouses, the process itself is dependent on factors that are outside of human control. In contrast, the other farm operations listed in the options - weed control, fertilizer application, transportation and handling, and crop processing - can all be mechanized to some extent. For example, there are machines that can apply fertilizers and herbicides to crops, transport harvested crops, and process crops for storage or consumption.