Question

(a) Explain the terms:
(i) Implantation (ii) Placenta

(b) What is the average duration of human pregnancy?

Answer 1

a(1).when embryo is embedded in lining of uterus is known as implantation.
(2).a disk like structure between uterus and embryo it provides nutrition to the baby

b.almost 9 months

Answer 2

Hey Friend,

1. Implantation - It is the process of attachment of blastocyst (mass formed by division of zygote) with the uterine wall.
 It takes places about a week after fertilization.

2. Placenta - A disc like structure formed as an association between the uterine wall of the mother and the extra-embryonic membranes of the foetus.
Or simply, it is a structure which attaches foetus to uterus.

3. The average duration of of human pregnancy in human females or gestation period in human females is 280 days or 40 weeks.

Hope it helps!