In which of the following is holoblastic cleavage observed?

Choose the correct pair:

Column-$I$	Column-$II$
$(A)$ Myometrium	$(1)$ Cushion of fatty tissue
$(B)$ Mons pubis	$(2)$ Tiny finger-like structure
$(C)$ Acrosome	$(3)$ External layer of uterus
$(D)$ Prostate gland	$(4)$ Middle thick layer of uterus
	$(5)$ Help in fertilization of ovum

Choose the correct option regarding the statements provided:
$(1)$ The process of fusion of a sperm with an ovum is called fertilization.
$(2)$ $LH$ surge induces the rupture of the Graafian follicle.
$(3)$ An $8$-celled embryo is called a morula.
$(4)$ The length of the fallopian tube is $8-10 \, cm$.

Which of the following is an example of a polyoestrous mammal?

Match the columns.

Column $I$	Column $II$
$(a)$ Corpus luteum	$(1)$ Initially in abdominal cavity then in scrotum
$(b)$ Testis	$(2)$ At the anterior part of scrotum in male
$(c)$ Myometrium	$(3)$ Graafian follicle
$(d)$ Penis	$(4)$ Uterus

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Endometrium is necessary for implantation of blastocyst.
Reason $R$: In the absence of fertilization,the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements,choose the correct answer from the options given below: