(a) Explain the terms:
(i) implantation (ii) placenta
(b) What is the average duration of human pregnancy?

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Solution

(a) (i) Implantation is the process wherein a fertilised egg (zygote) formed in the fallopian tube gets embedded on the walls of the uterus, inside the female body.

(ii) Placenta is a vascular structure present in the inner lining of the uterus. It is connected to the foetus by the umbilical cord. The embryo receives nutrition and oxygen from the mother’s blood via the placenta.

(b) The average duration of human pregnancy is nine months.

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Q. Explain the terms :

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(a) What is ovulation? How often does it happen in human females?
(b) Where does fertilisation take place in human females?
(c) Explain why fertilisation is possible if mating takes place during the middle of the menstrual cycle.
(d) What is meant by implantation?
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(f) What joins embryo to the placenta in mother's body?

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(a) Explain the terms: (i) implantation (ii) placenta ​(b) What is the average duration of human pregnancy?

(a) Explain the terms:
(i) implantation (ii) placenta
(b) What is the average duration of human pregnancy?