Hormonal Regulation & Ovulation Patterns — NEET Biology
📚 Practice ConceptWhat is menstrual cycle? Which hormones regulate menstrual cycle? 18. What is parturition? Which hormones are involved in induction of parturition? 19. In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct? 20. How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal? 21. How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
Which of the following statements concerning hormones involved in pregnancy and parturition are NOT correct? S1: Human placental lactogen (hPL) is secreted by the ovary and its levels decrease during pregnancy. S2: Increased levels of estrogens, progestogens, cortisol, prolactin, and thyroxine in maternal blood are essential for supporting fetal growth during pregnancy. S3: Oxytocin, released from the maternal pituitary, acts on uterine muscles to induce stronger uterine contractions during parturition. S4: Relaxin is secreted by the ovary in the later phase of pregnancy and directly induces the foetal ejection reflex. S5: The initial milk, colostrum, contains several antibodies crucial for developing resistance in newborn babies.
View solution & NCERT explanation
Correct answer: A — S1 and S4 only
This question evaluates the understanding of the roles and sources of various hormones during pregnancy and parturition. S1: Human placental lactogen (hPL) is secreted by the placenta, not the ovary, and its levels increase, not decrease, during pregnancy to support fetal growth. This statement is NOT correct. S2: Increased production of estrogens, progestogens, cortisol, prolactin, and thyroxine in maternal blood is essential for supporting fetal growth, metabolic changes in the mother, and maintenance of pregnancy. This statement is correct. S3: Oxytocin is released from the maternal pituitary and acts on the uterine muscle, causing stronger uterine contractions during parturition. This statement is correct. S4: Relaxin is secreted by the ovary in the later phase of pregnancy. However, the foetal ejection reflex is induced by signals originating from the fully developed foetus and the placenta, leading to mild uterine contractions, not directly by relaxin. This statement is NOT correct. S5: Colostrum, the milk produced during the initial days of lactation, contains several antibodies essential for developing resistance in newborn babies. This statement is correct. Therefore, S1 and S4 are the statements that are NOT correct.
What does NCERT say about What menstrual cycle Which?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.