Root development is promoted by
Abscisic acid
Auxin
Gibberellin
Ethylene
Correct Answer: B
Solution:
Root initiation is encouraged by auxins. Auxin promotes adventitious root production, or the branching of roots, as well as the growth of pre-existing roots. The total root growth is promoted when more natural auxin travels down the stem to the roots. For instance, when the supply of auxin is eliminated, stem tips are pruned, roots are therefore less stimulated, and stem development is maintained.