During pregnancy, sustained high hormone levels preserve the thick, vascularized uterine lining, preventing it from shedding so that it can continuously nourish and protect the developing embryo and fetus.
Class 9 Science Exploration Chapter 11 Important Questions from Reproduction
SQP from Class 9 Science Chapter 11 Reproduction How Life Continues
The menstrual cycle stops during pregnancy because the fertilized embryo implants directly into the inner uterine wall. To nourish and support embryonic development, the body secretes continuous hormones that keep the blood-rich uterine lining intact instead of breaking down. Because ovulation and the shedding of the uterine lining are suppressed, menstruation temporarily ceases until after childbirth.
For more NCERT Solutions of Class 9 Science Exploration Chapter 11 Reproduction How Life Continues Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-11/