Final answer:
The correct answer to separating rice using a rice mill machine is (d) Mechanical Separation, which is a method that does not alter the chemical composition but uses physical properties to separate different components.
Step-by-step explanation:
The modern way of harvesting rice using a rice mill machine is an example of mechanical separation. This method involves separating the grain of the rice from its husk or hull. Initially, the rice is threshed to remove the grains from the stalks. Following this, methods such as pounding may be used to further separate the hulls from the rice. The final stage generally involves winnowing, which separates the lighter husks from the heavier rice grains through air flow.
Mechanical separation is a type of physical method used to separate mixtures based on their physical properties without changing their chemical composition. This is distinct from methods like filtration, which are used to separate solids from fluids, or distillation, which separates substances based on differences in volatility. Mechanical separation is a broad category that includes various techniques applicable for separating solids from solids, like the winnowing process in rice milling.
In summary, the correct option in the context of harvesting rice with a rice mill machine is (d) Mechanical Separation.