Question

Which among the following differentiates ciliates from all other protozoans?

• A. They have flagella for locomotion
• B. They have contractile vacuole for removing excess water
• C. They use pseudopodia for capturing prey
• D. They have two types of nuclei

Answer 1

The correct option is D They have two types of nuclei

The two types of nuclei found in ciliates are the macronucleus and micronucleus. Macronucleus controls the metabolic activities and growth while micronucleus takes part in reproduction. They are observed in ciliates.
Flagella are the locomotory extensions and their number and distribution can vary from species to species.
Contractile vacuoles are meant for osmoregulation and excretion.
Pseudopodia help in holozoic nutrition. It is seen in certain protists where they engulf and ingest food particles.