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6.Anatomy of Flowering Plants
medium
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 $III$
Solution
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.
Standard 11
Biology
