Protozoans are unicellular in size and some are visible to naked eye,eukaryotic,chemoheterotrophic organisms.
- The term protozoa given by GOLD FUSS.
- The structure of protozoa are referred to as organelles(differentiated portions of cell) which perform various activities required for metabolism as in metazoa
- Difference between protozoa and rickettisia is : protozoa are eukaryotic, possess a cell wall and organelle for performing different metabolic activities whereas rickettisia are prokaryotic like bacteria and devoid of well developed cell wall.
- Protozoa form a subkingdom of the kingdom protista.
Most protozoa have two stages-
- Trophozoite – the feeding and growing stage
- Some protozoa will produce a protective capsule called a cyst.
- A cyst allows the parasite to exist outside of the host and be the infective stage allowing the parasite to get to another host.
Protozoa reproduce sexually and asexually
Asexually : Fission (mitosis), Budding, Schizogony.
Sexually : Conjugation, Gamete formation.
Definitive Host harbors the sexually reproducing stage
of parasite.
Intermediate Host harbors asexually reproducing
portion of the parasite’s life cycle.
Movement:
• A single or multiple flagella
• Cilia, Balantidium
• Pseudopodia, Enramoeba
• No obvious means of locomotion, Eimeria.
No comments:
Post a Comment