Question

If the anterior bud is broken, why do the lateral buds start to grow?

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Answer 1

Answer:

The apical bud produces a hormone, auxin, (IAA) that inhibits growth of the lateral buds further down on the stem towards the axillary bud. ... When the apical bud is removed, the lowered IAA concentration allows the lateral buds to grow and produce new shoots, which compete to become the lead growth.