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Biology 12 Chapter 21
Development and Aging - 14
1.
When does sexes of foetus begin to differentiate?
a) By the start of 3rd trimester
b) By the end of 1st trimester
c) By the start of 1st trimester
d) By the end of 2nd trimester
2.
What is the weight of foetus during 2nd trimester?
a) 0.6 kg
b) 0.5 kg
c) 0.3 kg
d) 0.4 kg
3.
What is the size of embryo during 3rd month?
a) 0.5 metre
b) 0.6 metre
c) 0.3 metre
d) 0.4 metre
4.
When does foetus look like human?
a) 5 month old
b) 3 month old
c) 6 month old
d) 4 month old
5.
When does cartilage of foetus replace by bones?
a) By 15th week
b) By 6th week
c) By 16th week
d) By 8th week
6.
When do sensory organs completely develop?
a) By 15th week
b) By 6th week
c) By 8th week
d) By 16th week
7.
When does foetus actively turn inside mother?
a) By 15th week
b) By 8th week
c) By 16th week
d) By 6th week
8.
When the heartbeat of foetus can be heard?
a) By the end of 5th month
b) By the end of 4th month
c) By the end of 3rd month
d) By the end of 6th month
9.
Finger nails appear by……………?
a) 3rd month
b) 5th month
c) 6th month
d) 4th month
10.
Subcutaneous fat begins to be deposited by………….?
a) 7th month
b) 9th month
c) 6th month
d) 8th month
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