Protozoa are single-celled eukaryotic organisms that range in size from 1 to 500 micrometers. They consist of cytoplasm divided into two layers - the outer ectoplasm layer is responsible for movement, feeding, respiration, and protection, while the inner endoplasm layer acts as the digestive system containing vacuoles and lysosomes. An amoeba is an example of a protozoan - it is a unicellular animal that uses pseudopods for locomotion and contains organelles like the nucleus, contractile vacuole, food vacuole, and digestive vacuole within its cytoplasm.

1. Dr. J. P. Saranraj
PROTOZOA
STRUCTURE

2. PROTOZOA
 Proto=first Zoa= animal
 Protozoa- eukaryotic organisms that consist of one cell
 Size: 1um-500um
 It can do all biology function
 Extremely diverse
 Protoplasm contain cytoplasm and one/more nucleus
 Cytoplasm divided 2 layer:
i) ectoplasm – movement (pseudopodia), to eat, respiration
and protection
ii) endoplasm – as digestion system ( particle, vacuole and
lysozyme) and osmoregulator

4. Structure of an Amoeba
Unicellular animal with pseudopods that lives in fresh or
saltwater.
Pseudopodium - part of the amoeba used for locomotion.
Ectoplasm - vitreous superficial layer of an amoeba.
Endoplasm - central part of an amoeba.
Cell membrane - membrane covering an amoeba.
Contractile vacuole - cavity of the amoeba that is able to
contract.
Food vacuole - cavity of the amoeba responsible for
digestion.
Nucleus - central organelle for an amoeba.
Digestive vacuole - cavity of the amoeba responsible for
digestion.