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B
Zonary
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C
Diffuse
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D
Cotyledonary
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Solution
The correct option is A Discoidal The placenta of humans and rodents is discoidal in nature.
The contact surface between the foetus and the maternal tissue is extremely important and in humans and rodents, it is mostly circular or disc-like in shape.
In the image above the no. 3 marks the discoidal placenta. 1 is uterine muscles and 2 is chorion.