Anatomy of Flowering PlantsEasy
Question
Heartwood differs from sapwood in
Options
A.presence of rays and fibers
B.absence of vessels and parenchyma
C.having dead and non-conducting elements
D.being susceptible to pests and pathogens
Solution
As a result of continued secondry growth in subsequent years, the older paert of secondry xylem or wood becomes non-functional as it loses the power of conduction. The cells of this wood are filled with resins or tannis produced by adjacent functional cells. the activityies of vessels becomes blocked by tyloses. Due to these activities, non- functional, secondry xylem becomes hard, durable and blackish in colour, called heart wood. Now the function of secondry xylem (water and mineral condition from roots) in performed by outer younger - ring of xylem, which is called sap wood.
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