Question

Protozoan protists are differentiated on the basis of

• A. Nuclei
• B. Shape
• C. Size
• D. Locomotory structures

Answer 1

The correct option is D Locomotory structures

• Phylum protozoa is classified on the basis of locomotory organelles. It is classified into four groups:-

1. Mastigophora (Zooflagellata): They possess flagella for locomotion.
   
2. Sarcodina (Rhizopoda): They develop pseudopodia which are temporary protoplasmic outgrowths.
   
3. Sporozoa: All sporozoans are endoparasites. Locomotory organelles are absent.
   
4. Ciliata: They develop a number of cilia during a part or whole of the life cycle.