Botany - Anatomy of Flowering Plants Question with Solution | TestHub
Which of the following xylem elements lack lignified cell wall?
Options:
Answer:
Solution:
Composition : 4 types of elements -
Tracheids : Elongated cells with tapering ends. Dead cells (no protoplasm) with lignified cell walls.
Vessels (Tracheae) : Vessel is tubular structure made up of cells (vessel members) joined together end to end. Dead cells (no protoplasm) with lignified cell walls and large central cavity. Members are interconnected by their perforated end walls. These are characteristic features of angiosperms (gymnosperms lack vessels).
Xylem fibres: Elongated cells with tapering ends and obliterated lumen. Dead cells (no protoplasm) with lignified cell walls. These may be septate or aseptate.
Xylem parenchyma : Living cells with thin cell wall made up of cellulose. These store food (starch, oil), tannin, etc. Ray parenchymatous cells also perform radial conduction of water.
