The root cap is covered by an undifferentiated sheath called $P$,and the shoot apex is enclosed in a hollow foliar structure called $Q$.
$\quad\quad\quad P \quad \quad Q$

• A
  $P = \text{Coleorhiza}, Q = \text{Coleoptile}$
• B
  $P = \text{Coleoptile}, Q = \text{Coleorhiza}$
• C
  $P = \text{Radicle}, Q = \text{Plumule}$
• D
  $P = \text{Plumule}, Q = \text{Radicle}$