Question

Vessels are found in

(a) all angiosperms and some gymnosperm

(b) most of angiosperms and few gymnosperms

(c) all angiosperms, all gymnosperms and some pteridophyta

(d) all pteridophyta.

Answer 1

Most of the angiosperm and few gymnosperms

Vessels are Characteristic of most flowering plants and absent from most gymnosperms and ferns. A vessel consists of a vertical series of vessel members that vary from elongated to squat, drum-shaped cells the walls of which are secondarily thickened with rings, spirals, or networks of cellulose, that later become lignified. The length of vessels varies from two cells to rows several metres long. During development, the end walls, already pitted, break through and eventually disappear.