The life of multicellular organisms begins with which of the following?

Fertilisation takes place in . . . . . . of Human.

Meroblastic cleavage refers to which type of division of egg?

Cleavage is a $\underline{A}$ which starts just after fertilization as the zygote moves through $\underline{B}$ of the oviduct towards the uterus.

Following are some events occurring during the fertilization process. Arrange the $CORRECT$ sequence of events and choose the option given below.
$i$. Fertilizin-antifertilizin reaction.
$ii$. Cortical reaction.
$iii$. Acrosome reaction.
$iv$. Karyogamy.
$v$. Capacitation of sperms.

Which of the following are secretions produced by the spermatozoa at the time of fertilization?