Home
Class 12
BIOLOGY
In old trees, central dark coloured, non...

In old trees, central dark coloured, non-conducting part of secondary xylem is referred to as

A

heartwood

B

sapwood

C

softwood

D

hardwood

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Study carefully the following statements and select the incorrect one(s). (i). Lateralroots develop from pericycle. (ii) . Endodermis is the innermost layer of cortex (iii). Sapwood is the central, dark coloured, non-conducting part of secondary xylem.

older resin-clogged central seconedary xylem and younger outer secondary xylem are respectively known as

State true(T) or false(F) to the given statements and select the correct option. ( a ) Annual rings are distinct in plants growing in temperate regions. ( b ) Lenticels occur in most woody trees and permit the exchange of gases. ( c ) Due to stelar secondary growth, central cylinder of wood surrounded by secondary phloem is formed. ( d ) The cells of endodermis opposite to protoxylem divide to give rise vascular cambium in dicot roots.

Assertion: The greater part of secondary xylem is lighter in colour and consists of dead elements with highly lignified walls and is called heartwood. Reason The peripheral region of the secondary xylem is dark brown in colour and is called sapwood.

In a five year-old stem the oldest layer of secondary xylem is situated just outside the primary xylem.

In old trees, which kind of wood conducts water and minerals from root to leaves?

In olds trees, part of secondary xylem that conduct H_(2) O and minerals is called

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by 1 absence of secondary xylem 2 absence of secondary phloem 3 presence of cortex 4 position of protoxylem

Complex compounds are molecular compounds which retain their identities even when dissolved in water. They do not give all the simple ions in solution but instead furnish complex ions. The complex compounds are often called coordination compounds because certain groups called ligands are attached to the central metal ion by coordinate or dative bonds. coordination compounds exhibit isomerism, both structural and stereoisomerism. the structure, magnetic property, colour and electrical properties of complexes are explained by various theories: Q. Arrange the following compounds in order of their molar conductance: (i) K[Co(NO_(2))_(4)(NH_(3))_(2)] (ii) [Cr(ONO)_(3)(NH_(3))_(2)] (iii) [Cr(NO_(2))(NH_(3))_(5)]_(3)[Co(NO_(2))_(6)]_(2) (iv) Mg[Cr(NO_(2))_(5)(NH_(3))]

The dark coloured dead wood present in the central region of old trees is called: