Question

Ciliates differ from all other protozoans in

• A. using pseudopodia in capturing prey
• B. having contractile vacuole for removing excess water
• C. using flagella for locomotion
• D. having two types of nucleus

Answer 1

The correct option is D having two types of nucleus

Protozoans belong to the kingdom Protista. They are heterotrophic and are mostly predators and parasites.

Amoeboid protozoans, ciliated protozoans (ciliates), flagellated protozoans and sporozoans are various types of protozoans.

Ciliates have small hair-like structures called cilia that help in locomotion. They do not have flagella for locomotion.

Ciliated protozoans contain two types of nuclei - a micronucleus and a macronucleus.

Contractile vacuole is present in almost all freshwater protozoans; it is an osmoregulatory structure and helps to remove excess water from the body.

Amoeboid protozoans use pseudopodia to capture prey and also for locomotion.