Secondary Growth - Practice Questions & MCQ

Secondary Growth

The growth that occurs along the main axis is called the primary growth. It occurs via the activity of the primary meristem.

• In most of the monocots and some herbaceous dicots, there is only primary growth.
• In the majority of angiosperms and gymnosperms, there is an increase in the girth of the stems and roots. Such growth in called the secondary growth. 
• Secondary growth occurs through the activity of lateral meristem or secondary meristem.
• Secondary growth occurs in two patterns:

1. Intrastellar secondary growth: It occurs through vascular cambium. It involves the formation of wood (secondary xylem) and secondary phloem.
2. Extrastellar secondary  growth: It occurs through the activity of cork cambium. It involves the formation of periderm.