Protozoa प्रोटोज़ोआ

Protozoa प्रोटोज़ोआ

प्रजीवगण (प्रोटोज़ोआ) एक एककोशिकीय जीव है । इनकी कोशिकायें युकैरियोटिक प्रकार की होती हैं । ये साधारण सूक्ष्मदर्शी यंत्र से आसानी से देखे जा सकते हैं । कुछ प्रोटोज़ोआ जन्तुओं या मनुष्य में रोग उत्पन्न करते हैं, उन्हे रोगकारक प्रोटोज़ोआ कहते हैं ।






Protozoa

Protozoa are a diverse group of unicellular eukaryotic organisms,many of which are motile. Historically, protozoa were defined as unicellular protists with animal-like behavior, such as movement or i.e., motility. Protozoa were regarded as the partner group of protists to protophyta, which have plant-like behavior, e.g. photosynthesis. The term protozoan has become highly problematic due to the introduction of modern ultrastructural, biochemical, and genetic techniques. Today, protozoan are usually single-celled and heterotrophic eukaryotes containing non filamentous structures that belong to any of the major lineages of protists. They are restricted to moist or aquatic habitats (i.e., they are obligate aquatic organisms). Many protozoan species are symbionts, some are parasites, and some are predators of soil bacteria and algae. There are an estimated 30,000 protozoan species