Which one of the following is a non-protoplasmic cell inclusion?
A
Ribosomes
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B
Mitochondria
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C
Lysosomes
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D
Cystoliths
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Solution
The correct option is D Cystoliths
Inclusions are considered to be nonliving components of the cell that do not possess metabolic activity and are not bounded by membranes. They may be of four categories - reserves, excretory, pigment and mineral.The most common inclusions are glycogen, lipid droplets, crystals and pigments.
Calcium carbonate occurs as a mass of crystals around a cellulose core to form cystolith. Example: Cystolith in the leaf hypodermis of banyan.