Give differences : Heartwood and Sapwood
Heartwood | Sapwood |
$(1)$ In old trees where secondary growth takes place in sufficient amount, that region is called Heartwood. | $(1)$ The outer region of secondary wood that possesses young xylem cells, such region is called sapwood. |
$(2)$ Its cells are filled with Tanin, Resin and other substances. |
$(2)$ It has living cells, tubes and fibres. |
$(3)$It is durable and has black colour | $(3)$ It is soft and of yellow colour. |
$(4)$ It gives mechanical strength. | $(4)$ It does physiological processes of plant. |
$(5)$ It loses the property of water transport. | $(5)$ It transports water and nutrients and stores food. |
The functional xylem of dicot tree is
Lenticels are formed in bark, which are
Secondary xylem and phloem in dicot stem are produced by
Bulliform cells found in
$A$ : Oldest layer of sapwood lies just outside vascular cambium.
$R$ : Sapwood contains actively conducting vessels and occupies central part of stem.