Question
Question: The placentation in a multilocular ovary, where the ovules are borne over the entire inner surface i...
The placentation in a multilocular ovary, where the ovules are borne over the entire inner surface is called as
A. Pendulous
B. Marginal
C. Superficial
D. Parietal
Solution
Superficial Placentation. This sort of placentation happens in a multicarpellary, multilocular ovary. The ovules are borne on placentae, which build up all round the internal surface of the parcel divider.
Complete answer:
In Angiosperms, ovules are available inside the ovary. Placenta is a unique sort of tissue, which interfaces the ovules to the ovary. The method of appropriation of placenta inside the ovary is known as placentation. Some significant sorts of placentation are as per the following:
1. Axile Placentation
This kind of placentation is found in bi-or multi carpellary, syncarpous ovaries. The carpel dividers meet in the focal point of the ovary, where the placenta are framed like focal segments. The ovules are borne at or close to the middle of the placenta in every locule. eg.Hibiscus.
2. Negligible Placentation
It happens in a monocarpellary, unilocular ovary. The ovules are borne along the intersection of the two edges of the carpel. eg.Fabaceae
3. Parietal Placentation
This kind of placentation is found in multi carpellary, syncarpous, unilocular ovaries. The carpels are combined simply by their edges. The placenta bearing ovules create at the spots, where the two carpels are melded. eg. Cucumber
4. Basal Placentation
It is seen in bicarpellary syncarpous, and unilocular ovary. The placenta grows straightforwardly on the repository, which bears a solitary ovule at the base of the ovary. eg. Asteraceae.
5. Superficial Placentation
This sort of placentation happens in a multicarpellary, multilocular ovary. The ovules are borne on placentae, which build up all round the internal surface of the parcel divider eg. Nymphaeaceae
So, the correct option: - (C) Superficial
Note: In superficial placentation, the ovary is multilocular, polycarpellary and syncarpous. The ovules are borne over the internal surface of the ovary. In superficial placentation, the ovary is normally one-chambered yet sometimes gets bilocular because of the arrangement of the bogus septum. The kind of placentation in which placenta structures an edge over the ventral stitch of the ovary and two separate columns of ovules are conceived is referred to as minimal placentation, for example, in peas. Pendulous placentation is the one wherein placenta is available at the highest point of the ovary with the ovules hanging down.