The cork is impervious to water due to
Lignin deposition in the cell wall
Compactness of cell
Suberin deposition in the cell wall
All of the above
One year's growth in length of a young woody shoot is the distance between successive
Select the wrong statements
$I.$ Primary and secondary phloem gets crushed during secondary growth
$II.$ During secondary growth, primary xylem remains more or less intact
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.
Write a note on spring wood and autumn wood.