Explain the menstrual cycle with a diagram.

First menstrual cycle is

Describe in detail the three phases of menstrual cycle with suitable diagrams.

Explain Nitrogen cycle with a diagram.

First menstrual cycle starts at

(a) Explain menstrual cycle in human females . ( b) How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure ?

Stages in menstrual cycle are