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Biology 12 Chapter 21
Development and Aging - 13
1.
Which extra embryonic membrane becomes the part of placenta?
a) Chorion
b) Amnion
c) Allantois
d) Yolk sac
2.
Which is the outer extra embryonic membrane?
a) Amnion
b) Allantois
c) Yolk sac
d) Chorion
3.
What is the function of placenta?
a) Nutrient uptake by foetus
b) Gas exchange
c) All of them
d) Waste elimination from foetus
4.
Which hormones are secreted by placenta?
a) LH and estrogen
b) Progesterone and estrogen
c) FSH and hCG
d) Progesterone and LH
5.
By the end of which trimester development of blood supply to placenta occurs?
a) 3rd
b) 1st
c) 2nd
d) 4th
6.
What happens by the end of 1st trimester?
a) All of them
b) hCG declines
c) Corpus luteum degenerates
d) Only placenta produces progesterone
7.
When does embryo tail disappear?
a) At the start of 2nd month
b) At the end of 2nd month
c) At the end of 3rd month
d) At the start of 3rd month
8.
At which trimester all major organs form?
a) 2nd
b) 1st
c) 4th
d) 3rd
9.
What is the size of embryo after two months?
a) 3.5 inches
b) 4.5 inches
c) 2.5 inches
d) 1.5 inches
10.
What is the size of embryo during 3rd month?
a) 1.5 inches
b) 2.5 inches
c) 4.5 inches
d) 3.5 inches
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