Cambium activity is highest in
Autumn
Spring
Winter
Rain
If the heart wood region of plant is removed or decays
Cork tissue arises from
What is/are true about heartwood?
$I.$ It does not help in water conduction.
$II.$ It is also called alburnum.
$III.$ It is dark in colour but very soft.
$IV.$ It has tracheary elements, which are filled with tannin, resin, etc.