Consider the following statements regarding the human scrotum and choose the correct combination:
(I) The scrotum is a pouch situated outside the abdominal cavity that houses the testes. (II) It maintains a testicular temperature of 2–2.5°C, which is higher than the normal internal body temperature to optimize sperm storage. (III) The low temperature maintained by the scrotum is absolutely necessary for the process of spermatogenesis. (IV) Each testis within the scrotum is spherical in shape with a length of 2 to 3 cm.
Explanation: Statement (I) is correct because the scrotum is a pouch outside the abdominal cavity. Statement (II) is incorrect because the scrotum maintains a temperature about 2–2.5°C lower than the normal internal body temperature. Statement (III) is correct because this lower temperature is essential for spermatogenesis. Statement (IV) is incorrect because each testis is oval in shape, about 4–5 cm long and 2–3 cm wide.
Question 2 of 100
📘 CLASS XII
Read the statements below concerning the internal structure of the human testis:
(I) Each testis contains approximately 250 compartments called testicular lobules. (II) Each testicular lobule contains one to three highly coiled seminiferous tubules where sperms are produced. (III) The inside of each seminiferous tubule is lined by three distinct types of cells: spermatogonia, Sertoli cells, and Leydig cells. (IV) Sertoli cells periodically undergo meiotic divisions to produce mature male gametes.
Explanation: Statements (I) and (II) are correct. Statement (III) is incorrect because seminiferous tubules are lined only by male germ cells (spermatogonia) and Sertoli cells. Leydig cells are present in the interstitial spaces outside the seminiferous tubules. Statement (IV) is incorrect because spermatogonia undergo meiosis, whereas Sertoli cells provide nourishment to developing germ cells.
Question 3 of 100
📘 CLASS XII
Analyze the statements regarding the interstitial spaces of the testis:
(I) The interstitial spaces are regions located outside the highly coiled seminiferous tubules. (II) These spaces contain small blood vessels and interstitial cells, also called Leydig cells. (III) Leydig cells are responsible for synthesizing and secreting testicular hormones called estrogens. (IV) Immunologically competent cells are completely absent in these interstitial regions.
Explanation: Statements (I) and (II) are correct because interstitial spaces contain blood vessels and Leydig cells. Statement (III) is incorrect because Leydig cells secrete androgens, not estrogens. Statement (IV) is incorrect because immunologically competent cells are also present in the interstitial spaces.
Question 4 of 100
📘 CLASS XII
Identify the correct pathway and characteristics of the male accessory sex ducts from the following statements:
(I) The seminiferous tubules open into the vasa efferentia through the rete testis. (II) Vasa efferentia leave the testis and open into the epididymis located along the anterior surface of each testis. (III) The epididymis leads to the vas deferens, which ascends to the abdomen and loops over the urinary bladder. (IV) The urethra originates from the urinary bladder and extends through the penis to its external opening called the urethral meatus.
Explanation: Statements (I), (III), and (IV) are correct. Statement (II) is incorrect because the epididymis lies along the posterior surface of each testis, not the anterior surface.
Question 5 of 100
📘 CLASS XII
Read the following statements regarding the male external genitalia and accessory glands:
(I) The penis is made up of special erectile tissue that facilitates insemination. (II) The glans penis is the enlarged end of the penis and is covered by a loose fold of skin called the foregut. (III) Seminal plasma is the combined secretion of paired seminal vesicles, a prostate, and paired bulbourethral glands. (IV) The secretion of the prostate gland is primarily responsible for the lubrication of the penis.
Explanation: Statement (I) is correct because erectile tissue facilitates insemination. Statement (II) is incorrect because the loose fold covering the glans penis is the foreskin (prepuce), not the foregut. Statement (III) is correct because seminal plasma is formed by the secretions of seminal vesicles, prostate gland, and bulbourethral glands. Statement (IV) is incorrect because lubrication of the penis is mainly provided by bulbourethral gland secretions.
Question 6 of 100
📘 CLASS XII
Concerning the female reproductive anatomy, select the correct statement combination:
(I) The female reproductive system includes a pair of ovaries, a pair of oviducts, a uterus, a cervix, a vagina, and external genitalia located in the pelvic region. (II) Mammary glands are integrated structurally but not functionally with the female reproductive organs. (III) Ovaries are the primary female sex organs that produce the female gamete (ovum) and several steroid ovarian hormones. (IV) Each ovary is about 10 to 12 cm in length and is directly attached to the kidneys.
Explanation: Statements (I) and (III) are correct. Statement (II) is incorrect because mammary glands are integrated both structurally and functionally with the female reproductive system. Statement (IV) is incorrect because each ovary is about 2–4 cm long and is attached to the pelvic wall and uterus by ligaments, not to the kidneys.
Question 7 of 100
📘 CLASS XII
Which of the following statements correctly describe the anatomy of the fallopian tubes?
(I) The part of the fallopian tube closer to the ovary is the wider, flask-shaped ampulla. (II) The edges of the funnel-shaped infundibulum possess finger-like projections called fimbriae. (III) Fimbriae help in the collection of the ovum after ovulation has occurred. (IV) The last part of the oviduct is the isthmus, which has a narrow lumen and connects directly to the uterus.
Explanation: Statement (I) is incorrect because the part of the fallopian tube closest to the ovary is the funnel-shaped infundibulum, not the ampulla. Statements (II), (III), and (IV) are correct.
Question 8 of 100
📘 CLASS XII
Read the statements regarding the layers and functions of the human uterus:
(I) The uterus is a single organ, also known as the womb, and has the shape of an inverted pear. (II) The outer thin membranous layer of the uterine wall is called the myometrium. (III) The middle thick layer of smooth muscle is the endometrium, which exhibits strong contractions during baby delivery. (IV) The inner glandular layer is the endometrium, which undergoes cyclical changes during the menstrual cycle.
Explanation: Statements (I) and (IV) are correct. Statement (II) is incorrect because the outer thin membranous layer is the perimetrium. Statement (III) is incorrect because the middle muscular layer is the myometrium, which contracts strongly during parturition.
Question 9 of 100
📘 CLASS XII
Evaluate the statements concerning the female external genitalia and hymen:
(I) Mons pubis is a cushion of fatty tissue covered by skin and pubic hair. (II) The labia majora are paired folds of tissue under the labia minora. (III) The clitoris is a tiny finger-like structure that lies at the upper junction of the two labia minora. (IV) The presence or absence of the hymen is a highly reliable indicator of virginity or sexual experience.
Explanation: Statements (I) and (III) are correct. Statement (II) is incorrect because the labia minora lie beneath the labia majora. Statement (IV) is incorrect because the hymen is not a reliable indicator of virginity or sexual experience.
Question 10 of 100
📘 CLASS XII
Read the statements below regarding the structure of the mammary glands:
(I) The glandular tissue of each breast is divided into 15–20 mammary lobes. (II) Mammary lobes contain clusters of cells called alveoli, which secrete milk. (III) The milk secreted by alveolar cells is stored in the lumens of the alveoli. (IV) Several mammary ducts join to form a wider mammary ampulla, which is directly connected to the lactiferous duct.
Explanation: All statements are correct. Each mammary gland contains 15–20 lobes with milk-secreting alveoli. Milk is stored in the alveolar lumen, and mammary ducts unite to form a mammary ampulla connected to the lactiferous duct.
