Question

Define Inorganic inclusions of a cell.

Answer 1

Hint: You can imagine cell inclusions as pigments or nutrients present inside prokaryotic or bacterial cells. They do not work like other organelles inside the cell. They can be understood as Ergastic substances which are defined as products of metabolism. Types of cell inclusions include lipids, glycogen, pigments like lipofuscin, melanin and hemosiderin. Cell inclusions are categorized into organic and inorganic cell inclusions.

Complete answer:
• Cell inclusions are located inside of the cell and are basically material which are products of cell metabolism. They are also referred to as ergastic substances which are non-protoplasmic material.
• Inclusion bodies are also called granules, and are divided into organic and inorganic inclusions based on their chemical properties. Both are located inside cells floating as tiny particles into cytoplasm. Cell inclusions appear and disappear at various stages of the cell's life cycle.
• Inorganic cell inclusions or granules are of many types which mainly contain inorganic material inside them. For example, Polyphosphate granule, magnetosome, sulfur granules and more. Inorganic cell inclusions in plants are a reserve food in form of calcium salts.
• On the other hand, organic granules are made up of organic material. They are also of many types namely, glycogen, poly beta hydroxybutyrate, cyanophycin and more.

Additional information:
Inclusion bodies contain less of the host's DNA/RNA fragments, proteins. Bacterial cell inclusions or granules, functions as energy storage and also help to reduce osmotic pressure. They are not bound by any membrane and float free in cytoplasm. For example, Phosphate granules, glycogen granules.

Note: You can imagine inclusion bodies as small granules in cytoplasm in prokaryotic cells. They are stored nutrients, pigments and secretory products.
Remember, Organic and inorganic cell inclusions can be differentiated by their names. Organic cell inclusions are made of organic material and inorganic cell inclusions are consisting of inorganic materials. And they are not membrane bound.