Companion cells in plants are associated with

  • A

    Vessels

  • B

    Sperms

  • C

    Sieve elements

  • D

    Guard cells

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$A$. According to Clowes root apex consists of an inverted cup like structure.
$B$. Low amount of $RNA$, $DNA$ and protein is characteristic of waiting meristem.
$C$. Cells of reserve meristem can divide only when the root apex gets injured.