How many of the following pairs of biomolecules and their functions/categories are correctly matched? (i) Trypsin - Hormone (ii) Collagen - Intercellular ground substance (iii) Codeine - Toxin (iv) Curcumin - Drug

Step-by-step solution

According to the NCERT tables on proteins and secondary metabolites: (i) Trypsin is an enzyme, not a hormone. Insulin is an example of a protein hormone. (Incorrect) (ii) Collagen is a protein that acts as an intercellular ground substance. (Correct) (iii) Codeine is a secondary metabolite categorised as an alkaloid, not a toxin. Abrin and ricin are toxins. (Incorrect) (iv) Curcumin is a secondary metabolite categorised as a drug. (Correct) Thus, exactly two pairs, (ii) and (iv), are correctly matched. Answer: Two