Question

What is/are true about heart wood?
(A) It does not help in water conduction.
(B) It is also called alburnum.
(C) It is dark in colour but very soft.
(D) It has tracheary elements which are filled with tannin, resin, etc.
I] B, C and D
II] A and D
III] B and D
IV] A, B and C

Answer 1

Hint: Heart wood is also called Duramen.It is extremely arduous. In addition, the cells of the wood are packed with secondary metabolites. It is named Heartwood because of its colour which is achromatic.

Complete answer: As a result of continuous secondary growth in consequent years, the older a part of the secondary vascular tissue or wood becomes non-functional because it loses the ability of physical phenomenon. The cells of this wood get crammed with resins or tannins that are made by the adjacent useful cells. The non-functional secondary vascular tissue becomes exhausting and sturdy. It is achromatic in color and is named heartwood.
So, the characteristics of wood are:
Statement A: It represents a non-functional part of the secondary vascular tissue and thus does not facilitate within the physical phenomenon of water.
Statement B: Sapwood is named alburnum that is lightweight in color and soft. It’s dark in color.
Statement C: It is dark in colour but soft. However, the heart wood is rough out of nature.
Statement D: Tannins, resins, gums area unit deposited within the tracheary parts. This is true, because, the vessels of wood square measure crammed with dark-colored extractives, includes, tannins, resins,
gums, phenols, oils, etc.
Hence, within option II, statements A and D are true for heartwood.

Note: There are two types of wood sapwood and heartwood. The central distinction between sapwood and heartwood is that sapwood happens in wood & peripheral regions whereas heartwood happens.