Sperms become non-motile in the vagina in

Fill in the blanks:
$(a)$ Humans reproduce . . . . . . (asexually/sexually)
$(b)$ Humans are . . . . . . (oviparous/viviparous/ovoviviparous)
$(c)$ Fertilization is . . . . . . in humans. (external/internal)
$(d)$ Male and female gametes are . . . . . . (diploid/haploid)
$(e)$ Zygote is . . . . . . (diploid/haploid)
$(f)$ The process of release of the ovum from a mature follicle is called . . . . . .
$(g)$ Ovulation is induced by a hormone called the . . . . . .
$(h)$ The fusion of the male and the female gametes is called . . . . . .
$(i)$ Fertilization takes place in the . . . . . .
$(j)$ The zygote divides to form . . . . . . which is implanted in the uterus.
$(k)$ The structure which provides vascular connection between the fetus and uterus is called . . . . . .

An egg with yolk in the center and cytoplasm surrounding it is known as:

Secretion of progesterone by the corpus luteum is initiated by

The eggs of an elephant are:

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ Placenta	$(i)$ Androgens
$(b)$ Zona pellucida	$(ii)$ Human Chorionic Gonadotropin $(hCG)$
$(c)$ Bulbo-urethral glands	$(iii)$ Layer of the ovum
$(d)$ Leydig cells	$(iv)$ Lubrication of the Penis