Question

Define marginal and free central and basal placentation with examples....

Answer 1

Hello!!

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✓ 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.

✓ 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 inDianthus and primrose.

✓ 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.

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Answer 2

HEYAA BUDDY❤

✔MARGINAL: In marginal placentation the Placenta forms a ridge along the ventral sutures of the ovary. The ovules are borne in two alternate rows along the ridge.
⭐Example: Pea Plant

✔FREE CENTRAL: The ovules are borne on central axis and septa are ansent in the ovary.
⭐Examples: Primrose, Dianthus.

✔BASAL: The placenta develops at the base of the ovary. It has singke ovuke attached to the placenta.
⭐Examples: Sunflower, Marigold.

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