Question
What is root cap? Which any two variations are found in this?

Answer

The apex of each root is covered by a cushion of thin-walled cells known as root cap. Variations:
  1. Multiple root cap is present in Pandanus (screw pine).
  2. In aquatic plants, the root apex is enclosed within a sac-like structure called root packet, e.g. Pistia, Eichhornia, etc.

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