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(D) $1$. Implantation: The process of attachment of the blastocyst to the uterine wall (endometrium) is called implantation,which leads to pregnancy.$

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(D) $1$. Implantation: The process of attachment of the blastocyst to the uterine wall (endometrium) is called implantation,which leads to pregnancy.$2$. Chorionic villi: After implantation,finger-like projections appear on the trophoblast called chorionic villi,which are surrounded by uterine tissue and maternal blood.$3$. Parturition: The process of delivery of the foetus (childbirth) is called parturition.$4$. Since all the given statements are scientifically accurate,the correct option is $D$.

Column $I$	Column $II$
$i$. Prostate gland	$a$. Hyaluronidase
$ii$. Acrosome of sperm	$b$. Inhibin
$iii$. Corpus luteum	$c$. Acid phosphatase
$iv$. Placenta	$d$. Human Chorionic Gonadotropin

Column-$I$	Column-$II$
$(A)$ Mons pubis	$(1)$ Embryo formation
$(B)$ Antrum	$(2)$ Sperm
$(C)$ Trophectoderm	$(3)$ Female external genitalia
$(D)$ Nebenkern	$(4)$ Graafian follicle

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Rapid secretion of $LH$ in ovulation causes

Match Column-$I$ with Column-$II$:
Column-$I$ Column-$II$
$(A)$ Mons pubis $(1)$ Embryo formation
$(B)$ Antrum $(2)$ Sperm
$(C)$ Trophectoderm $(3)$ Female external genitalia
$(D)$ Nebenkern $(4)$ Graafian follicle

In mammals,eggs are microlecithal and isolecithal because these are

The figure given below shows the sectional view of an ovary. Select the option which gives the correct identification of the marked structure ($A$ to $D$) and its feature.

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