alleryA tree trunk gets thicker every year. This increase in girth is:
ASecondary growth
BPrimary growth
CApical elongation
DSeed germination
Answer & Solution
Correct answer: A. Secondary growth
1. Lateral meristems such as vascular cambium appear later in life.
2. They add cells sideways, widening the organ.
3. That is secondary growth.
_Source: syllabus Biology, Chapter 15, Plant Growth and Development._
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