Question

Derivatives of the secondary
meristem in the steler region are
a)
Phellem and phelloderm
b) Alburnum and primary phloem
c) Duramen (heartwood) and
laburnum (sapwood)
d) Primary xylem and secondary
phloem​

Answer 1

Answer:

Stelar region of the plants is made up of the conducting tissues. The secondary meristem gives rise to an extensive secondary xylem in the stelar region and the secondary phloem towards outside. The secondary xylem so formed is called wood.  The wood which is formed in the early phases becomes non-functional after a period of time due to the deposition of tyloses. Such a wood is called heart-wood or duramen. It is non-conducting wood, The wood is formed later is called the sap-wood or the alburnum. It is the functional wood.

Hence, the correct answer is 'Duramen and Alburnum'