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Standard VII
Biology
Question

Why are protozoans regarded as primitive animals?
  1. They are unicellular and microscopic.
  2. Tissues, organs and organ systems are not developed in them.
  3. Both A and B.
  4. None of these.

A
They are unicellular and microscopic.
B
Both A and B.
C
Tissues, organs and organ systems are not developed in them.
D
None of these.
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Solution
Verified by Toppr

Protozoans are called primitive animals because they are regarded as ancestors of all multicellular eukaryotic organisms. They belong to the kingdom Protista. Protozoans have an acellular organization. They do not possess tissues and organs. They are mostly unicellular.
Hence the correct option is C.

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