By the end of the second month of pregnancy,the foetus develops........

In a human foetus,the limbs and digits develop by the end of:

Match the columns:

Column $I$	Column $II$
$(a)$ Third week	$(1)$ Development of pre-umbilical cord
$(b)$ Third month	$(2)$ Body develops but head remains big
$(c)$ Fourth week	$(3)$ Embryonic slit widens
$(d)$ Fourth month	$(4)$ Muscles activate

Major features of embryonic development at various months of pregnancy are given below. Choose the correct option for the correct sequential events.
$(i)$ The first movements of the foetus
$(II)$ The foetus develops limbs and digits
$(III)$ The embryo's heart is formed
$(IV)$ The body is covered with fine hairs

The pattern of cleavage in an egg is determined by which of the following?

High increase in $oxytocin$ level in a pregnant lady results in: