Q. Identify the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem. I.Secondary cortex II.Autumn wood III.Secondary phloem IV.Phellem
A) II, III, I and IV
B) III, IV, II, and I
C) IV, I, III and II
D) I, II, IV and III
Explanation
Phellem is a group of tissue formed due to activity of phellogen (cork cambium) towards the outer side, while towards the inner side, phellogen cuts another group of cells called phelloderm or secondary cortex. Below secondary cortex is occurred secondary phloem, it is formed due to activity of vascular cambium, which cuts secondary xylem towards inner side. This newly formed secondary xylem is called autumn wood.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.