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Theca - body form Protozoans
It is a close-fitting hard structure around the plasma membrane, mainly composed of cellulose. It can be compared with the ceil wall of a plant cell. Theca can be one to many layers thick but still remains flexible; sometimes it may become rigid after getting impregnated with inorganic salts. The surface of theca can be smooth and plain or rough and ornamented e.g. Glenodium.
Figure:Ornamental theca in Glenodium
Composition of Plant and Animal Tissues Food supplies nutrients popularly known as major and minor nutrients based on the quantities in which they are required for the living b
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