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Following substances cross the placental barrier against concentration gradient
A Calcium
B Amino acid
C Iron
D Magnesium
E Fat soluble vitamin
Placental barrier is composed of
A Syncytiotrophoblast
B Cytotrophoblast
C Endothelium of fetal blood vessels
D Amniotic membrane
E Decidua
Placental barrier
A Becomes a double layered membrane in late pregnancy
B Becomes thinner as villi lose their cellular and connective tissue surrounding the capillaries
C Is exclusively composed of maternal tissue
D Is composed of three layers in early stage
E Is a chorionic derivative
Placental insufficiency is caused by all except _
A Smoking in pregnancy
B Dieting in pregnancy
C Post maturity
D Multiple pregnancy
Among placental hormones, protein hormones are
A Human chorionic gonadotrophin
B Pregnancy associated plasma protein
C Prolactin
D Oestrogen
E Progesterone
Two beams, one of circular cross-section and the other of square cross-section, have equal areas of cross-sections. When these beams are subjected to bending,
A Both beams are equally economical
B Square beam is more economical
C Circular beam is more economical
D None of these
একজন অ্যাথলেট পৃথিবীতে দীর্ঘ লাফ দিয়ে সর্বোচ্চ 4 m দূরত্ব যেতে পারেন। এই অ্যাথলেট চাঁদের পৃষ্ঠে দীর্ঘ লাফ দিয়ে সর্বোচ্চ কত দূর যেতে পারবেন ? [পৃথিবীর ভর ও ব্যাসার্ধ চাঁদের ভর ও ব্যাসার্ধের যথাক্রমে 81 গুণ ও 4 গুণ] (An athlete can cross a maximum distance 4 m by a long jump on earth surface. What is the maximum distance the athlete can cross by a long jump on moon's surface? [The mass and radius of earth are 81 times and 4 times of moon's mass and radius, respectively.])
A 0.79m
B 9 m
C 20.25 m
D 16 m
E 32.35 m
Which of the following is not a barrier to effective communication?
A language
B defensiveness
C filtering
D channel richness
Which of the following would not be considered a barrier to entry?
A High innovation
B Concentration of distribution channels
C Steep experience curves
D Concentration of suppliers
The natural barrier to free movement of goods and services are ---
A Import duty
B Export duty
C Exchange control
D Distance

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