Vegetative Growth

What happens when the apex of a plant is removed?

Question

Vegetative Growth

What happens when the apex of a plant is removed?

BlackTom AI · Accepted Answer

In plant physiology, removing the apex affects apical dominance and the activity of lateral buds.
Option 1: The apical bud grows. This is unlikely after removing the apex; with the apical meristem removed, its growth is inhibited and the lateral buds are released from suppression, so the apical bud cannot continue to dominate.
Option 2: The lateral buds (aided by gibberellin) grow. Gibberellins influence stem elongation and certain developmental processes, but the classic trigger for lateral bud growth after apical removal is the change in auxin and cytokinin balance, not gibberellin-driven promotion.
Option 3: The lateral buds (aided by cytokinin) grow. This statement aligns with the established concept of release from apical dominance: removing the apex reduces auxin, and cytokinin promotes lateral bud outgrowth, leading to lateral branching.
Option 4: The apical bud (aided by gibberellin) grows. After apex removal, there is no apex to grow, and gibberellin is not the primary driver of compensatory apical growth in this context; the key response is lateral bud activation, not apical rebound growth.
Overall, the correct interpretation is that removing the apex releases the lateral buds from suppression, enabling their growth with cytokinin as the promoting factor.

Vegetative Growth What happens when the apex of a plant is removed?单项选择题

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