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  1. Macro and micronucleus are the characteristic feature of
    1. Paramecium and Vorticella
    2. Opelina and Nictothisus
    3. Hydra and Ballantidium
    4. Vorticella and Nictothirus
Correct Option: A

The macronucleus lacks nuclear membrane and is formed of trophochromatin. It regulates the metabolic activities of the body and it is also known as trophonucleus. The micronucleus has a definite nuclear membrane and controls the reproductive activities of Paramecium and Vorticella.



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