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Biology 12 Chapter 21
Development and Aging - 15
1.
When does body hair disappear?
a) By 6th month
b) By 8th month
c) By 9th month
d) By 7th month
2.
What is the size of foetus at the end of 9th month?
a) 30.5 inches
b) 20.5 inches
c) 3.5 inches
d) 2.5 inches
3.
Proper nourishment of mother is imperative during..................trimester?
a) 3rd
b) 4th
c) 2nd
d) 1st
4.
What is the weight of placenta?
a) 500g
b) 800g
c) 700g
d) 600g
5.
What is the thickness of placenta form its centre?
a) 5cm
b) 4cm
c) 3cm
d) 2cm
6.
Where does maternal and foetal blood mix?
a) Through umbilical cord
b) In the placenta
c) Not at all
d) Through chorionic villi
7.
What is called navel string?
a) Placenta
b) Umbilical cord
c) Chorionic villi
d) Decidua capsuiaris
8.
How many arteries are present in umbilical cord?
a) 1
b) 4
c) 3
d) 2
9.
How many veins are present in umbilical cord?
a) 4
b) 2
c) 1
d) 3
10.
Umbilical vein transports……………..blood?
a) Deoxygenated, nutrient-depleted
b) Oxygenated, nutrient-rich
c) Oxygenated, nutrient-depleted
d) Deoxygenated, nutrient- rich
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