Give differences: Heartwood and Sapwood
Heartwood | Sapwood |
$(1)$ In old trees where secondary growth takes place in sufficient amount,such that region is called Heartwood. |
$(1)$The outer region of secondary wood that possesses young xylem cells, such that 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 stength. | $(4)$It does physiological processes of plant. |
$(5)$ It loses the property of water transport. | $(5)$it transport water and nutrients and stores food. |
Which of the following are derived from the secondary meristems
The feature which is common to both heartwood and sapwood is
The secondary meristem initiates
$A$ : Bark is all the tissue outside steler cambium.
$R$ : Bark is formed due to the activity of phellogen only.
In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through