Give differences : Heartwood and Sapwood
 

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            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.

 

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