$A$ substance which accelerates the growth in stem is

What will happen if the shoot apex is removed from a plant?

$A$ : Auxin treatment causes acidification of the cell wall and helps in cell elongation.
$R$ : Loosening of cell wall microfibrils occurs.

The function of zinc is:

Highest concentration of auxins exists in

If the seedlings are grown in darkness,what is their physical appearance compared to those grown in light?