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. |
Seasonal activity of vascular cambium is influenced by many factors, except
Meristematic tissue in vascular bundle is
Assertion : In woody stems, the amount of heart wood continues to increase year after year.
Reason : The cambial activity continues uninterrupted
What is periderm? How does periderm formation take place in dicot stem?
What is the position of oldest secondary phloem?