Which element of xylem is the characteristic feature of angiosperms?
a)	Tracheids	b)	Phloem	c)	Vessels	d)	Xylem fibre

(c)

Vessel is a long cylindrical tube-like structure made up of many cells called vessel members, each with lignified walls and a large central cavity. The vessel cells are also devoid of protoplasm. Vessel members are interconnected through perforations in their common walls. The presence of vessels is a characteristic feature of angiosperms