The cork cambium, cork and secondary cortex are collectively called

The cork cambium, cork and secondary cortex are collectively called
  1. phellogen
  2. periderm
  3. phellem
  4. phelloderm

Solution

The periderm is a secondary protective structure and is made up of cork cambium (phellogen), cork (phellem) and secondary cortex (phelloderm).

Asked in: NEET 2011 (Screening)

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