(i) Secondary cortex (ii) Wood (iii) Secondary phloem (iv) Phellem
The correct order is
(a) (iv), (i), (iii), (ii)
(b) (iv), (iii), (i), (ii)
(c) (iii), (iv), (ii), (i)
(d) (i), (ii), (iv), (iii).
Ans: (a) (iv), (i), (iii), (ii)
Sol: In a woody dicot stem, phellem (cork) forms the outermost layer followed by phellogen and then secondary cortex (phelloderm). Secondary phloem forms a narrow circle on the outer side of vascular cambium whereas secondary xylem occurs on the inner side of vascular cambium.