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Standard XII
Biology
Pregnancy and Pregnancy Hormones
Development o...
Question
Development of placenta and chorion villi
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Choose the correct answers from the alternatives given.
In humans, the placenta develops from the chorion. This indicates that human development
Q.
Villi of human placenta develop from
Q.
Assertion: Foetal disorders can be diagnosed by chorionic villi sampling.
Reason: Karyotyping can be done for mitotically dividing cells of chorionic villi.
Q.
Assertion :After implantation, finger-like projections appear on the trophoblast called chorionic villi. Reason: Chorionic villi are surrounded by the uterine tissue and maternal blood.
Q.
When and where do chorionic villi appear in humans? State their function.
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