State the changes that take place in the uterus when:

(i) Implantation of embryo has occurred.

(ii) Female gamete/egg is not fertilised.




After implantation, 

  • a disc-like special tissue develops between the uterus wall and the embryo called the placenta.  
  • It is through the placenta that all the requirements of the developing foetus like nutrition, respiration, excretion, etc are met from the mother’s body. 


If the female gamete is not fertilised, 

  • then the thick and spongy uterus lining is not required. 
  • So, this breaks down and comes through the vagina as blood and mucus ie., menstruation occurs. 

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo