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Discussion

Contractile vacuole in Amoeba and Euglena differ in:

  • A.Fixed place at anterior and with many small vacuoles around it
  • B.Variable position with radiating canals
  • C.Presence of two permanent contractile vacuoles
  • D.None of these

Answer: A

Correct answer: Fixed place at anterior and with many small vacuoles around it

In Euglena the contractile vacuole sits permanently at the anterior end beside the reservoir, fed by a ring of small accessory vacuoles that discharge into it. In Amoeba there is no fixed position at all - the vacuole forms wherever it happens to and is carried about as the cytoplasm streams.

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