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2.Human Reproduction
normal
In the given diagram find out, $A, B$ and $C$
A
$A-$Plug of mucous in cervix, $B-$Placement villi, $C-$Umbilical cord
B
$A-$Umbilical cord, $B-$Placement villi, $C-$ Plug of mucous in cervix
C
$A-$Umbilical cord, $B-$Plug of mucous in cervix, $C-$ Placement villi
D
$A-$Placement villi, $B-$ Plug of mucous in cervix, $C-$Umbilical cord
Solution
After implantation, finger-like projections appear on the trophoblast called chorionic villi, which are surrounded by the uterine tissue and maternal blood. The chorionic villi and uterine tissue become interdigitated with each other and jointly form a structural and functional unit between developing embryo (foetus) and maternal body called placenta
Standard 12
Biology
