Concept: This question tests your knowledge of the economic importance and specific uses of plants belonging to the family Solanaceae, particularly focusing on their fumigatory properties.

Why (B) is correct: Tobacco (Nicotiana tabacum) is a well-known member of the family Solanaceae. Its leaves are dried and used for smoking, which is a form of fumigation, releasing smoke containing nicotine. Nicotine itself is also used as an insecticide, often applied as a fumigant.

Why other options are wrong:

• (A) Chilli, Petunia: Chilli (Capsicum annuum) is used as a spice, and Petunia (Petunia hybrida) is an ornamental plant. Neither is primarily fumigatory.
• (C) Belladona: Belladonna (Atropa belladonna) is a medicinal plant known for its alkaloids (atropine, scopolamine) but is not used as a fumigant.
• (D) Tomato, brinjal, potato: Tomato (Solanum lycopersicum), brinjal (Solanum melongena), and potato (Solanum tuberosum) are all important food crops and are not fumigatory.

NEET Tip: When studying plant families, always note down the economic importance of key members, including their uses as food, medicine, ornamentals, or other specific applications like fumigation.

Correct Answer: (B)