The viability period of human ovum is ______.

Human heart is _____.

Human egg is

The number of Barr bodies present in human ovum is_______.

Fill in the blank Gestation period for human boby is about ______days.

The rarest leucocyte of human blood is

The haploid content of human DNA is

The human female is:

(i) Explain the events taking place at the time of fertilisation of an ovum in a human female. (ii) Trace the development of the zygote up to its implantation in the uterus. (iii) Give the name and draw a labelled sectional view of the embryonic stage that gets implanted.

All oscillatory motions are periodic but periodic motions are not _____.

In male cells of humans _____ is absent.