MOVEMENT AND CYCLOSIS
Movement is the ability of living organisms to move from one place to another. Reason for movement include search for food, escape from danger, respond to stimuli and for the sake of production. All organisms that can move are equipped with various organelles or organs and mechanisms for movement.
Cyclosis is the circulation of protoplasm in cells. In animals, cyclosis occurs in prorozoa like Amoeba, popularly known as amoeboid movement.
Amoeboid movement is aided by a mechanism called cytoplasmic streaming.
ORGANELLES FOR MOVEMENT
Organelles which cause movements affecting the whole cells and leading to cellular locomotion in Paramecium, Chlamydomonas and Euglena are Flagella and Cilia.
FLAGELLA: These are long whip-like projections on the cell surface. They are usually one or two on a cell e.g. Euglena, Chlamydomonas, Spermatozoa, Trypanosome etc.
CILIA: Cilia are short, hair-like structures that project out of the cell’s surface. They are usually numerous and packed closely together. They move in a coordinated way to bring about movement.
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