Which of these is a special type of phellogen formed in the pericycle of roots in Rose

Options :
  1. Mesoderm
  2. Exoderm
  3. Polyderm
  4. Endoderm

Answer and Explanation :-

Answer: Option 3


In some plants of Rosaceae, Myrtaceae etc. a special phellogn is formed in the pericycle of the underground stems or roots. This cork cambium cuts, on the outer face, thin walled cells and endodermis like cells alternately. Casparian strips are also seen in these endodermis like cells, which later on become suberized. Such a composite type of tissue is called polyderm

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