Your engine can not operate with out its flow of oxygen, and your breather hose plays a big part of that function.

Venting from the side of the cylinder block, below the inlet manifold, into a small condenser unit. The air is then routed through a couple of small valves, finally venting into the air filter, allowing the fumes to be digested by the engine, burned, and expelled out of the exhaust system

You car is fitted with what is known as a CLOSED LOOP BREATHER SYSTEM wherein the crank fumes (oil etc) are passed into the intake for combustion, so preventing them from being passed into the atmosphere. The fumes are passed through breather hoses, such as the one you describe