As a group the protozoa are most primitive and are inhabiting the earth for about a billion and half years. Fossil forms of radiolaria and foraminiferans, half a billion years old, have been recorded. Origin: Pre-Cambrian Taxonomic Retrospect: Leeuwenhock (1676) first gave preliminary accounts of some protozoan forms after the discovery of microscope. Goldfuss (1818) coined the term Protozoa but [...]
In this article we will discuss about Protozoa:- 1. Nutrition in Protozoa 2. Respiration in Protozoa 3. Excretion 4. Reproduction. Nutrition in Protozoa: Nutrition is a process by which the individuals obtain nourishment. It includes ingestion, digestion, absorption and digestion. The nutrition of protozoa is manifested by following ways (Fig. 10.68): A. Holozoic or Zootrophic or Heterotrophic nutrition, B. Holotrophic [...]
In this article we will discuss about Euglena Viridis:- 1. Habit and Habitat of Euglena Viridis 2. Structure of Euglena Viridis 3. Locomotion 4. Nutrition 5. Respiration 6. Excretion 7. Osmoregulation 8. Reproduction 9. Encystment 10. Sensitivity. Contents: Habit and Habitat of Euglena Viridis Structure of Euglena Viridis Locomotion of Euglena Viridis Nutrition in Euglena Viridis Respiration in Euglena Viridis [...]