What is Placentation?
Answers
Answer:
Placentation is defined as the arrangement of the placenta or placentae in the ovary of a flower.
Six type of placentation were observed in plants. They are
1. Marginal- The ovules develop in rows near the margin on the placenta e.g., Leguminosae.
2. Parietal - The placenta is formed by the swelling up of cohering margins, and on the latter develop the ovules in rows. e.g., Papaveraceae.
3. Axile - the placentae develop from the central axis which corresponds to the confluent margins of carpels. e.g., Solanaceae, Malvaceae.
4. Free-central - the placenta develops in the centre of the ovary as a prolongation of the floral axis and the ovules are attached on this axis. e.g., Primulaceae.
5. Superficial - the ovules develop over the entire inner surface of the carpels. e.g., Nymphaea
6. Basal - The placenta develops directly on the thalamus and bears a single ovule at the base of the unilocular ovary, e.g., Compositae.
Answer:
in biology placentation refers to the arrangement of ovules inside the ovary
hope it helps.