Question

Derivative of the secondary meristem in the steler region are

• A. Phellem and Phelloderm
• B. Alburnum and primary phloem
• C. Duramen and alburnum
  
• D. Primary xylem and secondary phloem

Answer 1

The correct option is C Duramen and alburnum

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'