Question
Auxins promote
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$I.$ 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.
$I$. $H _{2} O$ $II$. $CO _{2}$ $III$. Light $IV$. Chlorophyll
Choose the correct option