Match the following columns and select the correct option. Column-I (a) Bt cotton (b) Adenosine deaminase deficiency (c) RNAi (d) PCR Column-II (i) Gene therapy (ii) Cellular defence (iii) Detection of HIV infection (iv) Bacillus thuringiensis (NEET 2020)
Answer: (C) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii). Answer: (C) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Solution: Bt cotton uses the toxin gene of Bacillus thuringiensis (a-iv).
- A.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
- B.(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
- C.(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)✓
- D.(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
Correct Answer
(C) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
Solution & Explanation
Answer: (C) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Solution: Bt cotton uses the toxin gene of Bacillus thuringiensis (a-iv). The first clinical gene therapy treated adenosine deaminase (ADA) deficiency (b-i). RNAi takes place in eukaryotes as a method of cellular defence (c-ii). PCR is routinely used to detect HIV in suspected AIDS patients, i.e., HIV detection (d-iii). This gives a-iv, b-i, c-ii, d-iii = option C. NCERT Reference: Ch 10, p.180, line 014 — "in all eukaryotic organisms as a method of cellular defense."