In dicot stem, the secondary growth takes place by

Options :
  1. Primary cambium
  2. Secondary cambium
  3. Development of cambium in stele region.
  4. Development of cambium in stele and in the cortical region
Answer and Explanation :-

Answer: Option 4

Explanation:

At the initial stage of secondary growth, cambium forms a ring like structure known as cambium ring. This ring is present in stelar an cortical region both.

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