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Protozoa are classified on the basis of

  • A.locomotory organelle
  • B.shape
  • C.number of nuclei
  • D.size

Answer: A

Correct answer: locomotory organelle

The traditional classification turns on how the animal moves: pseudopodia in Sarcodina, flagella in Mastigophora, cilia in Ciliata, and nothing at all in Sporozoa. Shape, size and nuclear number vary too widely within each group to serve, whereas the organelle of locomotion is constant and easily observed.

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