Identify the incorrect pair

Options

A. Toxin - Abrin
B. Lectins - Concanavalin A
C. Drugs - Ricin
D. Alkaloids - Codeine

Explanation

To identify the incorrect pair from the given options, we will analyze each pair of secondary metabolites mentioned in the question.

1. **Toxins: Abrin and Ricin**
- Both abrin and ricin are indeed toxins derived from plants. Abrin comes from the seeds of the rosary pea (Abrus precatorius), while ricin is obtained from the castor bean (Ricinus communis).
- **Conclusion**: This pair is correct.

2. **Lectins: Corn and Concanavalin A**
- Concanavalin A is a well-known lectin derived from the jack bean (Canavalia ensiformis), and corn (maize) does contain lectins as well.
- **Conclusion**: This pair is correct.

3. **Drugs: Racine**
- Racine is actually a toxin and not a drug. The correct examples of drugs in this context would be curcumin (from turmeric) and vinblastine (from the periwinkle plant).
- **Conclusion**: This pair is incorrect.

4. **Alkaloids: Codeine and Morphine**
- Both codeine and morphine are alkaloids derived from the opium poppy (Papaver somniferum). They are well-known for their medicinal properties as pain relievers.
- **Conclusion**: This pair is correct.

Based on the analysis of the pairs, the incorrect pair is the one that includes racine as a drug.

**Final Answer**: The incorrect pair is "Drugs: Racine".

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