One hormone hastens the maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively
1
Gibberellin, Auxin, Ethylene
2
Auxin, Gibberellin, Cytokinin
3
Gibberellin, Auxin, ABA
4
Auxin, Gibberellin, ABA