The arrangement of ovules attached to the sides of a syncarpous ovary with a single chamber is referred to as

Analyze the question: We need the type of placentation where ovules attach to the walls (sides) of a syncarpous ovary (carpels fused) that has only one chamber (locule).

Concept: Types of placentation

• Marginal: Found in a single carpel (monocarpous, e.g., beans/peas). Ovules attach along one margin (suture). The ovary is not syncarpous.
• Axile: Syncarpous ovary with several chambers. Ovules attach to a central axis where the partitions meet (e.g., hibiscus, tomato, orange).
• Free-central: Syncarpous ovary with one chamber. Ovules attach to a central column that rises from the base, with no partitions (e.g., primrose, dianthus).
• Parietal: Syncarpous ovary with one chamber. Ovules attach to the inner walls (sides) of the ovary, where the carpels fuse (e.g., pawpaw, cucumber).

Solution:

1. Syncarpous means fused carpels, which rules out marginal placentation (single carpel).
2. A single chamber rules out axile placentation (multiple chambers).
3. Between free-central and parietal, the key phrase is "attached to the sides" of the ovary. Free-central ovules attach to a central column, not the sides. Parietal ovules attach to the ovary wall.

Tip: Think of "parietal" like the "parietal bone" of the skull, which forms the side wall of the head. Parietal = wall/side. Also remember: Axile = Several chambers, Free-central = Central column, Marginal = Monocarpous (one carpel).