Question

Where can free central placentation be seen?

Answer 1

Hint: Placentation is the attachment of ovules inside the ovary in flowering plants. Funiculi, the plant counterpart of an umbilical cord, connect the ovules inside a flower's ovary (which subsequently form the seeds inside a fruit). The placenta is the portion of the ovary where the funiculus connects, the term placentation most commonly refers to the arrangement of ovules inside an ovary.

Complete answer:
In a compound ovary without septa or with septa at the base only, ovules develop on a central column. Placentation is a form of pregnancy. The ovules in the placenta and the placentas in the ovary are arranged in a certain way.
In the multicarpellary ovary, there is free central placentation. Early on, partition walls can be seen, but they collapse later and the ovary becomes unilocular. Only one central swelling placenta is present, bearing a number of ovules in the ovary's centre, isolated from the ovary wall, like in the Caryophyllaceae family. Parietal, axile, and parietal (or axile) placentation are found in the Cucurbitaceae, Malvaceae, and Orchidaceae families, respectively.
A single chambered ovary with ovules borne on the central axis has free central placentation. Citrus (axile placentation), Brassica with Argemone (parietal placentation), Dianthus (axile placentation) (free central).
Placentation is the arrangement of ovules within the ovary. Plants have several different forms of placentation:
The placenta is connected to a single ovule and is located at the base (bottom) of the ovary. Sunflower and marigold are two examples.
The ovary is one-chambered here, but because of the creation of the false septum, it becomes two-chambered. The ovules develop on the ovary's inner wall or on the periphery. For example, mustard and Argemone.
Axile placentation occurs when the placenta is axial and the ovules in a multilocular ovary are linked to it. China rose, tomato, and orange are examples.
The ovules are carried on the central axis and septa are absent in free central placentation. Dianthus and primrose are two examples. Marginal placentation occurs when the placenta develops a ridge along the ovary's ventral suture, and the ovules are carried in two rows on this ridge. It's a feature of legumes like peas.

Note:
The creation, kind, and structure, or arrangement of the placenta is referred to as placentation. Placentation transfers nutrients, breathing gases, and water from maternal tissue to a growing embryo, as well as removing waste from the embryo in some cases. Placentation is most commonly associated with live-bearing mammals, although it also occurs in a variety of fish, reptiles, amphibians, invertebrates, and flowering plants.