Placentation in fruits is referred to as the

Analyze the question: It asks for the definition of placentation, a term from flowering plant (angiosperm) reproductive structure.

Explain the concept: The placenta is the tissue in the ovary wall to which ovules are attached. Placentation is the arrangement of ovules (and their placentae) within the ovary. Common types include:

• Marginal: ovules along one edge of a single carpel (e.g. beans, peas)
• Axile: ovules on a central column in a multi-chambered ovary (e.g. hibiscus, tomato, orange)
• Parietal: ovules on the ovary wall
• Free-central: ovules on a central column without partitions (e.g. primrose)
• Basal: ovules at the base of the ovary
• Apical: ovules at the top of the ovary

Solution, option by option:

• A. Arrangement of ovules in the ovary: this is exactly what placentation means. ✔
• B. This describes the placenta itself (the site of attachment), not the arrangement, and "remain till maturity" is not part of the definition.
• C. This describes only one type of placentation (axile or free-central), not placentation in general.
• D. This describes a simple carpel and is not a definition of placentation. Also, carpels join at their edges, not "at the two edges of an ovule."

Answer: Option A. Placentation is the arrangement of ovules in the ovary of a flower.

Exam tip: Remember that the placenta is the place where ovules attach, while placentation is the pattern of that attachment. When a question asks for a general definition, avoid options that describe just one specific type, like option C.