Concept: This question tests your knowledge of different types of placentation in flowering plants, specifically identifying which plant exhibits parietal placentation.

Why (C) Mustard is correct: In parietal placentation, the ovules develop on the inner wall of the ovary or on peripheral parts. The ovary is typically unilocular (single-chambered) but can become bilocular due to the formation of a false septum (replum). This type of placentation is characteristic of the family Brassicaceae (Cruciferae), to which Mustard belongs.

Why other options are wrong:

• (A) Tomato: Exhibits axile placentation, where ovules are attached to the central axis in a multilocular ovary.
• (B) Lemon: Exhibits axile placentation, similar to tomato, with ovules on the central axis of a multilocular ovary.
• (D) Marigold: Exhibits basal placentation, where a single ovule is attached at the base of the ovary.

NEET Tip / Mnemonic: Remember 'Parietal = Mustard, Argemone, Dianthus' (MAD for parietal). For axile, think 'Tomato, Lemon, China rose'. For basal, 'Sunflower, Marigold'.

Correct Answer: (C)