Ciliates differ from all other protozoans in
- having two types of nuclei
- using flagella for locomotion
- using pseudopodia for capturing prey
- having a contractile excess water
The Correct Option is A
Solution and Explanation
Ciliates are a unique group of protozoans distinguished mainly by their possession of two types of nuclei: a macronucleus and a micronucleus. This feature is not found in other protozoans, which have only one type of nucleus.
Let's analyze the options:
- Having two types of nuclei: This is a characteristic feature of ciliates. The macronucleus is responsible for the everyday metabolic and developmental functions, while the micronucleus is involved in reproductive processes. Hence, this option is correct.
- Using flagella for locomotion: This is characteristic of another group of protozoans called flagellates, not ciliates.
- Using pseudopodia for capturing prey: Amoebas, another type of protozoan, use pseudopodia for movement and capturing food, not ciliates.
- Having a contractile vacuole for excess water: Although ciliates do possess contractile vacuoles for osmoregulation, this feature is not exclusive to them; it is found in various protozoans and other single-celled organisms.
Therefore, the correct answer is having two types of nuclei.
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