a vegetable room is a mean of room & a cell is a kind of object & a cell is very small ->  a plant cell is a very small object  a vegetable room is a very big preposition & a part of an object is smaller in size than the whole object -> a part of the plant cell will be smaller than a plant cell a part of the plant cell will be smaller than a plant cell  a part of the plant cell will be smaller than a plant cell & a streams is used to smell big nothing by car by wash them appear bigger -> a microscope can be used to see parts of the plant cell