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Solution


Q.

Ciliates differ from all other protozoans in                [2018]
1 using flagella for locomotion  
2 having a contractile vacuole for removing excess water  
3 using pseudopodia for capturing prey  
4 having two types of nuclei  

Ans.

(4)

Ciliates differ from other protozoans in having two types of nuclei: macronucleus and micronucleus (nuclear dimorphism). E.g., Paramecium has a macronucleus which controls metabolic activities as well as growth and a micronucleus that takes part in reproduction.