Question

Describe any four types of placentation found in flowering plants.

Answer 1

Basal placentation: The placenta is at the base (bottom) of the ovary and a single ovule is attached to it. ...

Parietal placentation: Here ovary is one-chambered but it becomes two- chambered due to the formation of the false septum.

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Answer 2

➡️Placentation refers to the arrangement of ovules inside the ovary.✔️

➡️It is of five basic types.✔️

(A) Marginal placentation:

➡️The ovary in which the placenta forms a ridge along the ventral suture of the ovary and the ovules develop on two separate rows is known to have marginal placentation.✔️

➡️This type of placentation is found in peas.✔️

(B) Parietal placentation

➡️When the ovules develop on the inner walls of the ovary, the ovary is said to have parietal placentation.✔️

C) Axile placentation

➡️In axile placentation, the placenta is axial and ovules are attached to it.✔️

➡️Examples include China rose, lemon, and tomato.✔️

(D) Basal placentation

➡️The ovary in which the placenta develops from its base and a single ovule is found attached to the base is said to have basal placentation.✔️

➡️It is found in marigold and sunflower.✔️

(E) Free central placentation

➡️In free central placentation, the ovules develop on the central axis while the septa are absent. ✔️

➡️This type of placentation is found in Dianthus and primrose.✔️