The on set of menstruation in girls is called
Menarche is correct as per The on set of menstruation in psychological principle and research evidence.
Ref: NCERT Psychology Class 12 Chapter 1 Assessment, Psychological Testing Textbook
#reproductive system
19 public questions tagged with this topic.
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______ provides passage for menstrual flow.
Vagina correct as per ______ provides passage for menstrual fl biology principle.
Ref: NCERT Biology Class XII — Human Reproduction and Reproductive Health
Where does the vas deferens emerge from?
Cauda epididymis correct as per Where does the vas deferens emerge from? biology principle.
Ref: NCERT Biology Class XII — Human Reproduction and Reproductive Health
The Müllerian duct develops into:
Müllerian ducts also called paramesonephric ducts arise alongside Wolffian ducts in both sexes during early fetal development. In absence of anti-Müllerian hormone as in female embryos, ducts persist, fuse caudally and differentiate under estrogen and Wnt signaling into oviducts, uterus, cervix and upper vagina; unfused cranial portions become Fallopian tubes. In males AMH secreted by Sertoli cells induces regression via apoptosis preventing female organ development, while testosterone maintains Wolffian derivatives forming epididymis and vas deferens. Therefore developmental fate of Müllerian
Ref: Gilbert, Developmental Biology, 12th ed., Chapter 17: Müllerian duct develops into female internal genitalia.
Incorrect statement about genital ridge determination?
Designating Rspo1 as promoter of testis pathway is incorrect because genetic evidence firmly places Rspo1 in ovarian network. Rspo1 synergizes with Wnt4 to activate β-catenin signaling, promoting granulosa differentiation and directly repressing Sox9/Fgf9 male program. Loss-of-function in humans and mice results in XX masculinization, appearance of Sertoli cells, androgen production and ovotestes, not testicular failure. Gain of Rspo1 activity antagonizes testis cord formation. Testis pathway instead relies on Sry, Sox9, Fgf9, Dmrt1 and Dhh. Therefore Rspo1 belongs to ovary-promoting module al
Ref: Gilbert, Developmental Biology, 12th ed., Chapter 6: Incorrect assignment of Rspo1 function; ovarian pathway genes.
Translocation of sperm assisted primarily by:
After deposition in vagina, sperm translocation through cervix, uterus and into oviduct depends on both autonomous motility and female tract facilitation. Cervical mucus filters immotile sperm, uterine peristaltic contractions propel sperm rapidly toward uterotubal junction, and oviductal ciliary beating generates fluid flow that must be overcome by rheotaxis. Coordinated contractions under oxytocin and prostaglandin influence provide long-distance transport exceeding intrinsic swimming velocity. Subsequent hyperactivated motility within oviductal isthmus enables mucus penetration, ascent towa
Ref: Gilbert, Developmental Biology, 12th ed., Chapter 7: Sperm transport – uterine contractions and motility in female tract.
Which segment of the fallopian tube is the most common site for fertilization?
The ampulla is the widest segment of the fallopian tube and is the most common site for fertilization.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Female Reproductive System and Gametogenesis
Which hormone, produced by the ovaries, inhibits FSH secretion to regulate follicular development?
Inhibin, produced by granulosa cells of the ovary, specifically inhibits FSH secretion to prevent overstimulation of follicular development.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Female Reproductive System and Gametogenesis
Which hormone is responsible for stimulating the growth and development of ovarian follicles?
Follicle-stimulating hormone (FSH) promotes the growth and maturation of ovarian follicles in females.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Mechanism of Hormone Action - Second Messengers
Which hormone plays a crucial role in female pregnancy maintenance?
Progesterone helps maintain pregnancy by preventing uterine contractions and supporting the uterine lining.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
Which of the following is an incorrect statement about testosterone?
Testosterone is primarily secreted by the testes, not in large amounts by the adrenal cortex.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
Which hormone is secreted by the corpus luteum after ovulation?
After ovulation, the corpus luteum secretes progesterone, which helps maintain pregnancy.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
