- Explain the terms:
- Implantation.
- Placenta.
- What is the average duration of human pregnancy?
CBSE DELHI - SET 1 2009
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- Implantation: It is the process of after fertilization the attachment of the ovum to the endometrium.
- Placenta: Placenta is the connection between mother and embryo. Placenta plays the role of respiration, nourishment and excretion of the embryo.
- Average duration of human pregnancy is 40 weeks Or 9 months.
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