$P-protein$ is a component of:

Collenchyma is

Phloem fibers are made up of .......... tissue.

In which of the following plant organs is collenchyma tissue absent?

$P$-protein is found in

The first formed primary phloem is referred to as $A$. The later formed primary phloem is referred to as $B$. Choose the correct combination of $A$ and $B$.