In which of the following pairs of plants do the ovules develop on the inner wall of the ovary or on its peripheral part?

Step-by-step solution

In parietal placentation, the ovules develop on the inner wall of the ovary or on its peripheral part. The ovary is initially one-chambered but becomes two-chambered due to the formation of a false septum. Mustard and Argemone are examples of plants that exhibit parietal placentation. Dianthus and Primrose exhibit free central placentation. Sunflower and Marigold exhibit basal placentation. Tomato and Lemon exhibit axile placentation. Answer: Mustard and Argemone