Which one of the following pairs is incorrectly matched?
| Column 1 | Column 2 |
| 1) ELISA | a) Antigen-antibody interaction |
| 2) Bt cotton | b) Bacillus thuringiensis toxin gene |
| 3) Golden rice | c) Vitamin 'A' enriched |
| 4) Rosie | d) First transgenic sheep |
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 4
Each row pairs a product or technique of biotechnology with what it is. Three rows are right; the wrong one is the row on Rosie.
Row 1: ELISA – Antigen-antibody interaction. Correctly matched. ELISA (Enzyme Linked Immuno-sorbent Assay) detects an infection through antigens of the pathogen or the antibodies made against it.
Row 2: Bt cotton – Bacillus thuringiensis toxin gene. Correctly matched. Bt cotton carries a Bt toxin gene cloned from the bacterium, so it resists bollworms.
Row 3: Golden rice – Vitamin ‘A’ enriched. Correctly matched. Golden rice is an example of GM food with enhanced nutritional value.
Row 4: Rosie – First transgenic sheep. Incorrectly matched. Rosie was the first transgenic cow. Her milk was enriched with a human protein, alpha-lactalbumin.
NCERT Extract:
Molecular Diagnosis – “… ELISA is based on the principle of antigen-antibody interaction.”
Biotechnological Applications in Agriculture – “… enhanced nutritional value of food, e.g., golden rice, i.e., Vitamin ‘A’ enriched rice. … Bt toxin gene has been cloned from the bacteria and been expressed in plants to provide resistance to insects without the need for insecticides; in effect created a bio-pesticide. Examples are Bt cotton, Bt corn, rice, tomato, potato and soyabean etc.”
Transgenic Animals – “… In 1997, the first transgenic cow, Rosie, produced human protein-enriched milk (2.4 grams per litre).”