The region of actively dividing cells located at the tips of shoots and roots that produces primary growth and increases plant length. The apical meristem also produces leaf primordia and determines plant architecture.
From Latin 'apex' (tip, summit) combined with Greek 'meristos' (divisible), literally meaning 'divisible tip.' The term was coined in the 19th century as botanists identified these growth zones at plant extremities.
Apical meristems are like plant GPS systems - they don't just grow randomly but actively 'decide' which direction to grow based on light, gravity, and obstacles! Some can even 'remember' past experiences and modify their growth patterns accordingly, showing a primitive form of plant learning.
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