Download Protista

Protista
(Amoeba)
Amoeba
Characteristics of Amoeba:
Member of Protista Kingdom.
Unicellular microscopic organism found at the
bottom of freshwater ponds or muddy soil.
Eukaryotic (membrane enclosed organelles)
Heterotrophic (- takes in food).
Omnivore (- eats other plants and animals)
Carries out all life processes!
Structure of Amoeba
Please be familiar with diagram of amoeba Handout 1
Cell Membrane: holds in cell contents and allows gas
exchange.
Nucleus: controls the cell activities.
Food Vacuole: release enzymes to digest and absorb
food.
Pseudopodia: are false feet used for movement and also
to surround its prey.
Structure of Amoeba
Cytoplasm: - contains digested material.
- moves into pseudopodia causing
movement.
- divided into two parts:
Ectoplasm: outer cytoplasm.
Endoplasm: inner cytoplasm.
Structure of Amoeba
Contractile Vacuole: maintains salt and water balance
within cell (Osmoregulation):
- collects water entering cell by osmosis.
- swells, touches cell membrane.
- bursts expelling water.