Q.Starch, Cellulose, Glycogen, Chitin are polysaccharides found among the following. Choose the one appropriate and write against each.
Cotton fibre
Exoskeleton of cockroach
Liver
Peeled potato

• Cotton fibre is made of cellulose, the plant cell wall polysaccharide, which is why cotton fibre and paper are both essentially cellulose.
• The exoskeleton of a cockroach is built from chitin, the complex polysaccharide of modified sugars that forms arthropod exoskeletons.
• Liver stores its carbohydrate energy reserve as glycogen, the animal storage polysaccharide built from glucose. …

Each of the four named polysaccharides has a distinct, characteristic location where it is found:

• Cellulose is the material of plant cell walls, built as a homopolymer of glucose units linked together; cotton fibre, like paper made from plant pulp, is essentially cellulose.
• Chitin is a complex polysaccharide built from modified sugars such as glucosamine and N-acetyl galactosamine; it forms the exoskeletons of arthropods, so the hard outer covering of a cockroach is chitin.
• Glycogen is the energy-storage polysaccharide used by animals, a branched homopolymer of glucose stored particularly in tissues such as the liver. …

Method: Match Each Polysaccharide to Its Signature Location

This kind of matching question rewards building a small mental table of "polysaccharide → where it is found → what organism/tissue" rather than trying to reason it out from the structure of each molecule. The four classic polysaccharides in this chapter each have one place they are famously associated with: cellulose with plant cell walls (and therefore with plant-fibre products like cotton and paper), starch with plant storage organs (tubers, seeds, grains), glycogen with animal storage tissue (liver and muscle), and chitin with the hard exoskeletons of arthropods and the cell walls of fungi.

Once you have that table memorised, matching becomes mechanical: read each item in the question (cotton fibre, cockroach exoskeleton, liver, peeled potato) and ask "which organism/tissue is this, and which polysaccharide is that tissue known for?" rather than trying to work out the chemistry from scratch each time. …