Q. Assertion: In opposite phyllotaxy two leaves are borne on the opposite sides of a single node.
Reason : Opposite phyllotaxy is seen in China rose and Oleander.

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Solution:

In opposite phyllotaxy, two leaves are borne on the opposite sides of a single node e.g., Quisqualis (opposite and superposed) and Calotropis (opposite and decussate). Nerium or Oleander shows whorled type of phyllotaxy and China rose exhibits alternate phyllotaxy.