NEET 2015
- Exam
- NEET
- Year
- 2015
- Subject
- Botany
- Chapter
- Anatomy of Flowering Plants
NEET 2015 · Botany · Anatomy of Flowering Plants
Read the different components from (i) to (iv) in the list given...
Read the different components from (i) to (iv) in the list given below and tell the correct order of the components with reference to their arrangement from the outer side to the inner side in a woody dicot stem :
(i) Secondary cortex
(ii) Wood
(iii) Secondary phloem
(iv) Phellem
(i) Secondary cortex
(ii) Wood
(iii) Secondary phloem
(iv) Phellem
Options
- A(i), (ii), (iv), (iii)
- B(iv), (i), (iii), (ii)
- C(iv), (iii), (i), (ii)
- D(iii), (iv), (ii), (i)
Correct answer
B. (iv), (i), (iii), (ii)
Step-by-step solution
Phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem while the inner cells differentiate into secondary cortex or phelloderm.
The cambial ring becomes active and begins to cut off new cells, both towards the inner and the outer sides. The cells cut off towards pith, mature into secondary xylem (wood) and the cells cut off towards periphery mature into secondary phloem (bast).
The sequence of different components of woody dicot stem from the outer side to the inner side is