The sclerenchyma of the hypodermis in the Pinus needle helps in
Increasing the absorptive surface of the cell
Checking transpiration
Mechanical support
Photosynthesis
Grafting is not possible in monocots because they
The intrafascicular cambium
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.
Cambium activity is
Each of the following terms has some anatomical significance. What do these terms mean ? Explain with the help of line diagrams.
$(A)$ Plasmadesmoses / Plasmodesmata
$(B)$ Middle lamella
$(C)$ Secondary wall