If the external solution is less concentrated than the cytoplasm,it is called $P$. If the external solution is more concentrated than the cytoplasm,it is called $Q$. If the external solution balances the osmotic pressure of the cytoplasm,it is called $R$.

  • A
    $P$: Isotonic,$Q$: Hypertonic,$R$: Hypotonic
  • B
    $P$: Hypotonic,$Q$: Hypertonic,$R$: Isotonic
  • C
    $P$: Hypertonic,$Q$: Hypotonic,$R$: Isotonic
  • D
    $P$: Isotonic,$Q$: Hypotonic,$R$: Hypertonic

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