Aerating pores are present at places on the cork cambium. These are called

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

Narrow bands of parenchymatous tissue which passes through the secondary xylem and phloem radially are called

$I.$ Annual rigs are formed as a result of seasonal environmental conditions

$II.$ Tracheids/vessels elements are larger during periods when water is abundant

$III.$ Tracheids/vessels elements have thicker wall during periods of water deprivation

$IV.$ Wood formed in the previous years is darker than newer wood

Select the combination of correct statements from the options given below

In a dicot stem, the interfascicular cambium strip arises

The bark of tree comprises