biology

2. Why they are the same ?
 They are protozoa
 They are one cell thick
 They are unicellular
organisms

3. Kingdom Protista
Phylum Protozoa
Class Sarcodina
Subclass Rhizopoda
order Amoebida
family amoebidae
Genus Amoeba
Species Proteus , animalcule, dubia ,etc

4. Amoeba Proteus / Chaos diffluens
 Closely related to giant
amoeba
 Commonly bought at
science supply stores

5. Chaos Carolinense / giant amoeba
 Largest and best known
species
 About 5mm
 Has thousands of
nucleus even amoeba
normally has 1

6. Dictyostelium discoideum
Soil-living amoeba

7. Structure of Amoeba sp.

8. Question : Where did the oxygen
comes from ?

9. Answer : Simple diffusion

10. CONCENTRATION GRADIENT

11. Respiration process in amoeba
• external surface of amoeba provide adequate
surface area to volume
Surface area
volume
Rate of respiration

12. • amoeba has large surface area compared to
bodies .
• Simple diffusion is sufficient to transport the
gas around , into and out of their bodies.
• Aquatic habitats ensure that plasma
membrane is constantly moist , so respiratory
gases can easily dissolve and diffuse across the
respiratory surface

13. • Amoeba has a thin plasma membrane –
allows rapid diffusion of gases
• large surface area – ensure a maximum
contact with respiratory medium

14. Characteristic Protozoa - Amoeba
Respiratory system none
Respiratory organ none
Respiratory structure for gaseous
exhange
Plasma membrane
Respiratory openings none
Network of blood capillaries none
Passage of respiratory gases none