Question

Distinguish between marginal and parietal placentation

Answer 1

Explanation:

In Marginal placentation the placenta forms a ridge along the ventral suture of the ovary and the oviles are borne on this ridge forming two rows as in pea .

In parietal

placentation. the ovules develop on the inner wall of the ovary or on peripheral part. Ovary is one-chambered but it becomes two-chambered due to the formation of the false septum, e.g.. mustard

and Argemone

Answer 2

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MARGINAL PLACENTATION ----

The ovules develop in rows near the margin on the placenta formed along the ventral suture.

It occurs in monocarpellary and unilocular ovary

e.g., Leguminosae

PARIETAL PLACENTATION ----

The placenta is formed by the swelling up of cohering margins, and on the latter develop the ovules in rows.

It occurs in bicarpellary or multicarpellary but unilocular ovary

e.g., Papaveraceae.

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