Reproductive System and Hormones Practice Questions
32 free Reproductive System and Hormones practice questions for the Zoology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Sperm production occurs specifically within which structure?
- A Epididymis
- B Seminiferous tubules
- C Prostatic urethra
- D Interstitial Leydig cells
Correct answer: Seminiferous tubules
Spermatogenesis occurs in the seminiferous tubules of the testes. The epididymis stores and matures sperm, while Leydig cells produce testosterone rather than sperm.
Which cells in the testes secrete testosterone?
- A Sertoli cells
- B Leydig cells
- C Spermatogonia
- D Germ cells
Correct answer: Leydig cells
Leydig cells, located in the interstitial spaces of the testes, produce testosterone. This hormone regulates male secondary sexual characteristics and spermatogenesis.
The primary function of Sertoli cells is to:
- A Produce sperm within the seminiferous tubules
- B Secrete testosterone into bloodstream
- C Nourish and support developing sperm
- D Store and concentrate mature sperm
Correct answer: Nourish and support developing sperm
Sertoli cells support, nourish, and regulate the development of sperm cells. They also form the blood-testis barrier, protecting developing gametes from immune attack.
Which hormone initiates spermatogenesis by acting on Sertoli cells?
- A LH
- B FSH
- C Testosterone
- D Progesterone
Correct answer: FSH
Follicle-stimulating hormone acts on Sertoli cells to promote spermatogenesis. LH primarily stimulates Leydig cells to produce testosterone.
Which structure stores and allows maturation of sperm before ejaculation?
- A Seminiferous tubules
- B Vas deferens
- C Epididymis
- D Urethra
Correct answer: Epididymis
The epididymis stores sperm and allows them to mature and gain motility. Mature sperm are later transported during ejaculation.
The female gonads responsible for ova production are the:
- A Uterus
- B Oviducts
- C Ovaries
- D Cervix
Correct answer: Ovaries
Ovaries produce female gametes (ova) and secrete estrogen and progesterone. They are the primary reproductive organs in females.
Ovulation refers to the release of:
- A A primary oocyte from the ovary
- B A secondary oocyte from the ovary
- C A mature ovum from the uterus
- D A fertilized zygote from the oviduct
Correct answer: A secondary oocyte from the ovary
Ovulation is the release of a secondary oocyte from the ovary. This event usually occurs midway through the menstrual cycle under the influence of the LH surge.
Which hormone is responsible for the development of female secondary sexual characteristics?
- A Progesterone
- B LH
- C Estrogen
- D FSH
Correct answer: Estrogen
Estrogen promotes the development of female secondary sexual characteristics such as breast development. It also regulates the menstrual cycle.
Which structure is the site of fertilization in humans?
- A Uterine cavity
- B Ovarian surface
- C Cervical canal
- D Fallopian tube
Correct answer: Fallopian tube
Fertilization typically occurs in the ampullary region of the fallopian tube. The zygote then travels to the uterus for implantation.
Progesterone is mainly responsible for:
- A Ovulation
- B Development of ovarian follicles
- C Maintenance of pregnancy
- D Initiation of menstrual flow
Correct answer: Maintenance of pregnancy
Progesterone prepares and maintains the uterine lining for implantation and pregnancy. It is secreted mainly by the corpus luteum.
Which hormone surge directly triggers ovulation?
- A Follicle-stimulating hormone (FSH)
- B Estrogen
- C Progesterone
- D Luteinizing hormone (LH)
Correct answer: Luteinizing hormone (LH)
A sudden surge in luteinizing hormone (LH) induces ovulation. This surge is triggered by rising estrogen levels from the dominant follicle.
The menstrual cycle is regulated by hormones secreted from the:
- A Thyroid and adrenal glands
- B Ovary and pituitary gland
- C Pancreas and ovary
- D Hypothalamus and adrenal gland
Correct answer: Ovary and pituitary gland
The pituitary gland secretes FSH and LH, while the ovaries secrete estrogen and progesterone. These hormones coordinate the menstrual cycle.
Which phase of the menstrual cycle is characterized by thickening of the endometrium?
- A Menstrual phase
- B Follicular phase
- C Luteal phase
- D Ovulatory phase
Correct answer: Luteal phase
During the luteal phase, progesterone secreted by the corpus luteum causes the endometrium to thicken and become secretory, preparing the uterus for potential implantation of a fertilized egg.
The corpus luteum develops from the:
- A Primary follicle
- B Secondary follicle
- C Graafian follicle
- D Atretic follicle
Correct answer: Graafian follicle
After ovulation, the ruptured Graafian follicle transforms into the corpus luteum. It secretes progesterone to support early pregnancy.
Which hormone inhibits FSH secretion in males?
- A Testosterone
- B Estrogen
- C Inhibin
- D LH
Correct answer: Inhibin
Inhibin is secreted by Sertoli cells and selectively inhibits FSH secretion. This provides feedback regulation of spermatogenesis.
Which structure connects the ovary to the uterus?
- A Cervix
- B Fallopian tube
- C Vagina
- D Broad ligament
Correct answer: Fallopian tube
The fallopian tubes transport the oocyte from the ovary to the uterus. They are also the site where fertilization typically occurs.
Which hormone maintains male secondary sexual characteristics?
- A Cortisol
- B Estradiol
- C Testosterone
- D Corticosterone
Correct answer: Testosterone
Testosterone regulates male secondary sexual characteristics such as facial hair, muscle mass, and deep voice. It also supports spermatogenesis.
The hypothalamic hormone that controls the release of FSH and LH is:
- A GnRH
- B TRH
- C ACTH
- D Oxytocin
Correct answer: GnRH
Gonadotropin-releasing hormone from the hypothalamus stimulates the pituitary to release FSH and LH. It plays a key role in reproductive regulation.
Which part of the female reproductive system serves as the birth canal?
- A Uterus
- B Cervix
- C Ovary
- D Vagina
Correct answer: Vagina
The vagina acts as the birth canal during parturition. It also receives sperm during copulation.
Negative feedback regulation in reproduction mainly involves:
- A FSH stimulating GnRH secretion
- B LH directly stimulating estrogen release
- C Sex hormones inhibiting pituitary secretion
- D Hypothalamus directly inhibiting the ovaries
Correct answer: Sex hormones inhibiting pituitary secretion
Sex hormones like testosterone, estrogen, and progesterone inhibit the secretion of pituitary gonadotropins (FSH and LH) through negative feedback. This maintains hormonal balance throughout the reproductive cycle.
Which cells in the testes produce testosterone?
- A Sertoli cells
- B Leydig cells
- C Germ cells
- D Epithelial cells
Correct answer: Leydig cells
Leydig cells are located in the interstitial spaces of testes. They secrete testosterone under LH stimulation.
Which structure stores and allows maturation of sperm?
- A Testes
- B Epididymis
- C Urethra
- D Seminal vesicle
Correct answer: Epididymis
The epididymis stores sperm and allows them to mature. Mature sperm gain motility here.
Which hormone stimulates spermatogenesis by acting on Sertoli cells?
- A LH
- B Testosterone
- C Progesterone
- D FSH
Correct answer: FSH
FSH stimulates Sertoli cells, which support sperm development. It plays a key role in spermatogenesis.
Which structure serves as the birth canal in females?
- A Ovary
- B Uterus
- C Fallopian tube
- D Vagina
Correct answer: Vagina
The vagina serves as the birth canal. It connects the uterus to the external body.
Which organ produces ova in females?
- A Uterus
- B Fallopian tube
- C Vulva
- D Ovary
Correct answer: Ovary
Ovaries are the female gonads that produce ova. They also secrete estrogen and progesterone.
Which hormone surge triggers ovulation?
- A Follicle-Stimulating Hormone
- B Estrogen
- C Progesterone
- D Luteinizing Hormone
Correct answer: Luteinizing Hormone
A surge in luteinizing hormone (LH) triggers ovulation. It causes the mature follicle to release the ovum.
Where does fertilization typically occur in humans?
- A Ovary
- B Uterine cavity
- C Cervix
- D Fallopian tube
Correct answer: Fallopian tube
Fertilization usually occurs in the fallopian tube. The sperm meets the ovum here.
Progesterone mainly functions to:
- A maintain pregnancy
- B stimulate ovulation
- C produce sperm
- D increase FSH
Correct answer: maintain pregnancy
Progesterone prepares and maintains the uterine lining for pregnancy. It is secreted by the corpus luteum.
Which phase of the menstrual cycle involves thickening of the endometrium?
- A Proliferative phase
- B Menstrual bleeding phase
- C Ovulatory phase
- D Luteal phase
Correct answer: Proliferative phase
During the proliferative phase, estrogen stimulates the growth of the endometrium. This prepares the uterus for possible implantation.
Which hormones are secreted by the anterior pituitary to regulate reproduction?
- A FSH and LH
- B TSH and LH
- C Estrogen and progesterone
- D Testosterone and inhibin
Correct answer: FSH and LH
FSH and LH are secreted by the anterior pituitary and regulate gamete production and hormone secretion. GnRH, unlike FSH and LH, is released by the hypothalamus rather than the pituitary.
Negative feedback in reproductive hormones mainly involves:
- A Inhibition of its own secretion
- B Increased overall hormone production
- C Increased cell division
- D Suppressed ovulation
Correct answer: Inhibition of its own secretion
Negative feedback occurs when a hormone inhibits its own further release. For example, rising testosterone levels suppress GnRH, LH, and FSH secretion.
Which gland controls the release of reproductive hormones through GnRH?
- A Hypothalamus
- B Pituitary gland
- C Thyroid gland
- D Adrenal
Correct answer: Hypothalamus
The hypothalamus releases GnRH, which controls pituitary secretion of FSH and LH. It regulates the reproductive system.