Question
The place where auxins are active is
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| Column $I$ | Column $II$ |
| $a.$ Ethephon | $(i)$ $GA$ |
| $b.$ Terpene | $(ii)$ Ethylene |
| $c.$ Zeatin | $(iii)$ Natural auxin |
| $d.$ $IAA$ | $(iv)$ Cytokinin |
$I.$ Secondary cortex
$II.$ Autumn wood
$III.$ Secondary phloem
$IV.$ Phellem