Question
______ induces lateral cell
expansionÂSolution
Ethylene: This hormone inhibits longitudinal (lengthwise) cell elongation and instead promotes lateral/radial cell expansion . It causes the cells to expand horizontally, making the stem or root grow thicker rather than longer. This is a classic part of the seedling "triple response" to mechanical stress.
Auxin: Primarily promotes longitudinal/vertical cell elongation (making the plant grow taller) through the acid growth hypothesis and regulates apical dominance.
Gibberellin: Primarily drives stem elongation by promoting cell division and longitudinal cell elongation in the internodes.
Brassinosteroids: Work synergistically with auxin to promote cell division and longitudinal elongation , rather than lateral swelling.
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