Protista

Classification of organisms Living things are divided into five Kingdoms: Living things Monera Protista Fungi Plants Animals Necessary due to the large number of organisms in the world – makes it easier to manage – like our wardrobe. Every single living thing must fit into one of these groups. Kingdoms!

The Protista Single celled or simple organisms which have a nucleus Are found anywhere that water is present – ponds, lakes ,oceans, damp soil etc.

Protista Amoeba is an organism which belongs to the Protista Kingdom! Lives at the bottom of freshwater ponds and streams About 1 mm in diameter Eats protists, plants and animals material is absorbed form the food vaculoe into the cytoplasm Endoplasm moves out to the pseudopodia to help it to move around It lives in freshwater habitats!

How could you avoid this? Amoeboid diseases it causes a disease called amoeba dysentery: severe diarrhoea, cramps and intestine ulcers. How could you avoid this? In tropical countries it is the leading cause of child and infant death. The most common cause is drinking contaminated water.

Amoeba Amoeba is only made up of one cell which has to do everything itself! Ectoplasm Endoplasm Cytoplasm Pseudopodia used to move amoeba and surround food. Nucleus Controls the cell The ectoplasm is more fluid than the endoplasm. The endoplasm is grainy material is absorbed form the food vaculoe into the cytoplasm Endoplasm moves out to the pseudopodia to help it to move around Contractile vacuolt fills with water that enters ameoba, it expands, touches the cell wall and then expels the water – eithout it amoeba would burst! osmoregulation Food vacuole Secretes acids to kill prey and enzymes to digest them Cell membrane Allows the diffusion of gases in and out of the cell. Waste Products Contractile Vacuole Removes excess water from the cell

Feeding in Amoeba - engulfment Food Vacuole

Control of water in Amoeba

Do you know? Can you give an example of a protist, and describe... Structure Habitat Feeding Water regulation