explain what is promeristem,primary and secondary meristmatic tissues.

Promeristem 

  • Group of cells which represent primary stages of meristematic cells. 
  • They are found at the apices of embryonic shoots and roots and give rise to primary meristem.

Primary meristem 

  • They originate from promeristems. 
  • They are found at shoot and root apices, apex of leaves ans in intercalary parts. 
  • They give rise to primary permanent tissue.

Secondary meristem

  • Develop at the later stage from primary permanent tissue e.g. interfascicular cambium, cork cambium etc..
  • Give rise to secondary permanent tissue.

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