Which of the following according to Takhtajan is most primitive form of node

Options :
  1. Multilacunar node
  2. Unilacunar 2 trace node
  3. Trilacunar 4 trace node
  4. None of these

Answer and Explanation :-

Answer: Option 3


The parenchymatous region left behind in the main vascular cylinder due to departure of leaf trace is called leaf gap (lacuna). Unilacunar node has one leaf gap, Trilacunar node has three and Multilacunar type have several leaf gaps.

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