Study the given flow chart. Which of the following are the correct examples of W, X, Y and Z?

Riccia is a-bryophyte and is a non-vascular plant, i.e., xylem and phloem are absent. Marsilea is a pteridophyte, possessing vascular system but it does not produce flowers and is seedless. Cycas is a gymnosperm that produces seeds which are naked, i.e., not enclosed within fruits. Ipomoea is an angiosperm. It is highly evolved plant with seeds protected inside fruits.