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A pistil typically consists of an expanded basal portion called an ovary, an elongated section called a style and an apical structure called a stigma that receives pollen. The ovary (from Latin ovum, meaning egg) is the enlarged basal portion which contains placentas, ridges of tissue bearing one or more ovules (integumented megasporangia). The ...
Placenta – Placentation – Axile – Basal – Free-central – Pariental – Septum – Simple pistil – Syncarpous – the gynoecium consists of one pistil. Unicarpellate – Stigma – Sessile - absent style. Style – position is relative to the body of the ovary. [15] Terminal or apical – arising at the apex of the ovary (commonest).
The part of the ovary where the funiculus attaches is referred to as the placenta. In botany, the term placentation most commonly refers to the arrangement of ovules inside an ovary. Placentation types include: Basal: The placenta is found in mono to multi carpellary, syncarpous ovary. Usually a single ovule is attached at the base (bottom).
There is only one elongated placenta on one side of the ovary, as ovules are attached at the fusion line of the carpel's margins . This is conspicuous in legumes. Simple carpel, unilocular ovary. (e.g. Pisum) Parietal placentation: Placentae on inner ovary wall within a non-sectioned ovary, corresponding to fused carpel margins.
The placenta (pl.: placentas or placentae) is a temporary embryonic and later fetal organ that begins developing from the blastocyst shortly after implantation.It plays critical roles in facilitating nutrient, gas and waste exchange between the physically separate maternal and fetal circulations, and is an important endocrine organ, producing hormones that regulate both maternal and fetal ...
It is an outgrowth of the placenta, important in nourishing and guiding pollen tubes to the micropyle. [17] The ovary of some types of fruit is dehiscent; the ovary wall splits into sections called valves. There is no standard correspondence between the valves and the position of the septa; the valves may separate by splitting the septa ...
An alternative spelling of caespitose, meaning tufted or turf-like, e.g. the growth form of some grasses. chamber A cavity of an ovary. channelled Sunken below the surface, resulting in a rounded channel. chartaceous Having a papery texture. chasmogamous Of flowers that are pollinated when the perianth is open. Compare cleistogamous. chasmophyte
The placenta connects the developing embryo to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply. The umbilical cord is the connecting cord from the embryo or fetus to the placenta.