Question

Fish glue is obtained from
A. Air bladder and skin
B. Liver and skin
C. Bones and skin
D. Scales and skin

Answer 1

Hint: Glue is an adhesive material used for sticking things. It is transparent and water-soluble. Gelatin, collagen are some of the basic adhesives which when processed can give us high tensile strength glue.

Complete solution: How fish glue is obtained? It is obtained by prolonged boiling of the connective tissue of the fishes. Connective tissues contain collagen, skin, bones etc.
How strong is the fish glue? Glue from the cold water fishes has low tensile strength but is not that weak. It is used for glueing the wood, papers, leather etc.
Let us learn what we get from fish with different body parts.
> Air bladder – We obtain isinglass from here. It is a gel-like substance used to clear the wine and beer so that their turbidity is not seen.
> Skin – Fish skin has a potential of producing gelatin with a good gel strength and viscosity. This is suitable for producing glue with an appropriate stickiness.
> Liver –Fish liver usually contributes to the food items taken by humans. The fish liver has a high content of vitamin A and D. It improves the eyesight and reduces the heart disease risk. They are a source of polyunsaturated fatty acids.
> Bones – Fish bones are a part of connective tissue so their long boiling will give adhesive glue.
> Scales – fish scales have chitin in them. It is used for making shimmery lipsticks, repairing material for car paint.
By reading uses of all the body parts of the fishes, we can now observe that only the bones and skin tend to give the fish glue.

> So the answer is option C: bones and skin

Note: Fish glue can be used immediately taken out of the bottle. It is easy to work and handle. So the fishes have many uses either being the food sector or cosmetics.