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Q. No.Which of the following correctly describes the two phases of the ovarian cycle?
1.
The follicular phase involves follicle development, estrogen secretion, and endometrial growth, while the luteal phase involves corpus luteum formation and progesterone secretion.
2.
The follicular phase is characterized by corpus luteum formation, while the luteal phase involves follicle development.
3.
Both the follicular and luteal phases involve only estrogen secretion.
4.
The luteal phase occurs before ovulation, and the follicular phase occurs after ovulation.
Subtopic: Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase |
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Which layer of the uterine wall undergoes cyclical changes during the menstrual cycle?
| 1. | Perimetrium | 2. | Myometrium |
| 3. | Endometrium | 4. | Cervical canal |
Subtopic: Female Reproductive System-1 |
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Identify the incorrect statement:
| 1. | If fertilization occurs, the corpus luteum persists and continues secreting progesterone to maintain the endometrium. |
| 2. | In the absence of fertilization, the corpus luteum degenerates, leading to the breakdown of the endometrium and the onset of menstruation. |
| 3. | During pregnancy, cyclic menstruation continues to ensure a healthy uterine environment for foetal development. |
| 4. | Menopause marks the cessation of the menstrual cycle around the age of 50, indicating the end of the reproductive phase. |
Subtopic: Menstrual Cycle: Luteal Phase |
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Parturition is controlled by a neuroendocrine reflex, involving oxytocin release in response to uterine contractions. How does oxytocin reinforce the process of childbirth?
| 1. | It suppresses progesterone secretion, allowing uterine contractions to intensify. |
| 2. | It causes cervical dilation by directly acting on fetal tissues. |
| 3. | It inhibits maternal stress hormones to ensure smooth delivery. |
| 4. | It triggers stronger uterine contractions, which stimulate further oxytocin release. |
Subtopic: Fetal Development & Parturition |
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Spermatogenesis begins at puberty due to increased secretion of GnRH, which stimulates the anterior pituitary to release LH and FSH. What would be the most immediate effect of a mutation that prevents LH secretion in a developing male?
| 1. | Leydig cells fail to produce androgens, leading to impaired spermatogenesis. |
| 2. | Sertoli cells stop supporting sperm maturation, preventing spermiogenesis. |
| 3. | Testosterone production remains unaffected due to alternative signaling pathways. |
| 4. | The anterior pituitary compensates by increasing GnRH secretion, restoring normal spermatogenesis. |
Subtopic: Seminiferous Tubules & Spermatogenesis |
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Implantation occurs at which stage and when?
| 1. | Morula stage, day 2-3 post fertilization |
| 2. | Blastocyst stage, day 6-7 post fertilization |
| 3. | Gastrula stage, day 10-12 post fertilization |
| 4. | Zygote stage, day 1 post fertilization |
Subtopic: Implantation |
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The scrotum helps in maintaining the lower temperature of the testes, which is essential for spermatogenesis. What is the temperature difference between the scrotal sac and the internal body temperature?
1. 1–1.5°C lower
2. 2–2.5°C lower
3. 3–3.5°C lower
4. 4–4.5°C lower
1. 1–1.5°C lower
2. 2–2.5°C lower
3. 3–3.5°C lower
4. 4–4.5°C lower
Subtopic: Male Reproductive System |
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The follicular phase of the menstrual cycle is marked by which of the following processes?
| 1. | Corpus luteum formation |
| 2. | Regression of endometrium |
| 3. | LH surge leading to ovulation |
| 4. | Growth of primary follicles and regeneration of the endometrium |
Subtopic: Menstrual Cycle |
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Which part of the blastocyst is responsible for attaching to the endometrium during implantation?
1. Inner cell mass
2. Blastocoel
3. Trophoblast
4. Morula
1. Inner cell mass
2. Blastocoel
3. Trophoblast
4. Morula
Subtopic: Implantation |
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During pregnancy, the levels of which of the following hormones increase significantly in maternal blood?
| 1. | Estrogens, progestogens, prolactin, thyroxine |
| 2. | Oxytocin, testosterone, insulin, glucagon |
| 3. | Melatonin, leptin, gastrin, adrenaline |
| 4. | Dopamine, serotonin, erythropoietin, calcitonin |
Subtopic: Embryonic Development till Gastrulation |
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