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Standard XII
Biology
Axile and Parietal Placentation
Ovules in Arg...
Question
Ovules in Argemone develop on the inner wall of the ovary. It exhibits
A
parietal placentation
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B
marginal placentation
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C
axile placentation
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D
free central placentation
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Solution
The correct option is
A
parietal placentation
Placentation is the arrangement of ovules inside the ovary with the help of the placental tissue.
Parietal placentation is where the ovules are arranged on the inner walls of the ovary.
Marginal placentation is where the ovules are arranged at the margins of the ovary
Axile placentation is where the ovules are arranged along the central axis attached to the wall by septa
Free central similar to the axile placentation but not attached to the ovary walls by partitions
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Assertion :
The placentation in which the placenta forms a ridge along the ventral suture of ovary and ovules are borne on this ridge forming two is called parietal placentation.
Reason:
The marginal placentation has ovules developed on the inner wall of the ovary or on peripheral part
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