Carefully observe the given diagram and answer the questions related with it:

The inner wall of uterus ………….....
(i) Before ovulation and
(ii) What happens if ovum does not get fertilised ?

Explanation

(i) Before ovulation, the inner wall of uterus becomes thick, spongy and with full of blood supply.
(ii) If ovum does not get fertilised, then thick and spongy wall of uterus along with blood and dead ovum comes out of the vagina in the form of bleeding. i.e., Menstruation.