Question

In roots and stems, secondary growth takes place after the formation of

• A. Cambium
• B. Sclerenchyma
• C. Cork
• D. Bark

Answer 1

Answer: (A)

The correct option is A Cambium

• Apart from primary growth most dicotyledonous plants exhibit an increase in girth. This increase is called the secondary growth.
  
• The tissues involved in secondary growth are the two lateral meristems: vascular cambium and cork cambium.
  
• Once the formation of cambial ring is complete then secondary growth starts with formation of secondary xylem and secondary phloem.
  
• The cambial ring becomes active and begins to cut off new cells, both towards the inner and the outer sides. The cells cut off towards pith,
  

mature into secondary xylem and the cells cut off towards periphery

mature into secondary phloem.

• So, the correct answer is 'Cambium'.