Protein that helps fish to survive below freezing point is:

Correct option is B

Correct Answer: (b) Antifreeze protein
Explanation:
→ Antifreeze proteins (AFPs) prevent ice crystal formation in polar and subpolar fishes.
→ They bind to small ice crystals and inhibit their growth, lowering the freezing point of body fluids.
→ Found in Antarctic notothenioids and Arctic fishes.
Information Booster:
→ AFPs allow survival in waters reaching –2°C.
→ Important in cryobiology and biotechnology.
→ Produced in liver and circulated through bloodstream.
Additional Information (Other Options): Not involved in freezing-point depression.