Q.Study the transverse section of human ovary given below and answer the questions that follow :
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🔒 Start your 14-day free trial to unlock the full solution →Concept understanding — Reproductive System Functions
Reproductive System Functions – A First Look
Think about what every living thing does, without exception: it reproduces. A mango tree grows from a seed, flowers, and produces more mangoes. A cat gives birth to kittens. You yourself are here because two people, your parents, reproduced. Reproduction is the biological process by which organisms create new individuals of their own kind — it is the reason life continues across generations.
For a commerce or humanities student, the reproductive system is not about complicated diagrams or medical terms. It is about understanding the purpose and basic working of the system that ensures the survival of the human species. The NCERT textbook presents this as a fundamental life process, just like nutrition, respiration, or excretion.
What Does the Reproductive System Do?
The primary function of the reproductive system is to produce offspring. But that simple statement hides a lot of careful design. The system must:
- Produce gametes — the male sperm and the female egg (ovum).
- Transport these gametes so they can meet and fertilise.
- Provide a safe environment for the development of the fertilised egg into a baby.
- Nourish the newborn after birth (through milk production in females).
In humans, reproduction is sexual — it requires two parents, one male and one female. This is different from asexual reproduction (like a bacterium splitting into two), and it introduces genetic variation, which is why brothers and sisters are not identical copies of each other.
The reproductive system is the only organ system that is not essential for the survival of the individual — you can live without reproducing. But it is essential for the survival of the species. That is why it is considered a life process in biology.
The Male Reproductive System – Key Functions
The male system is designed to produce and deliver sperm. The NCERT textbook highlights these main parts and their roles:
- Testes (two oval organs): Produce sperm and the male hormone testosterone. Testosterone is responsible for changes during puberty — deeper voice, facial hair, muscle growth.
- Duct system (epididymis, vas deferens, urethra): Stores sperm and transports it out of the body.
- Accessory glands (seminal vesicles, prostate gland, bulbourethral glands): Add fluids to the sperm to form semen. These fluids nourish the sperm and help them swim.
The entire process is controlled by hormones from the brain (pituitary gland) and the testes themselves.
The Female Reproductive System – Key Functions
The female system is more complex because it must not only produce eggs but also support a growing baby. The NCERT textbook describes these main functions:
- Ovaries (two almond-shaped organs): Produce eggs (ova) and the female hormones oestrogen and progesterone. These hormones regulate the menstrual cycle and prepare the body for pregnancy.
- Fallopian tubes (oviducts): Carry the egg from the ovary to the uterus. Fertilisation (fusion of sperm and egg) usually happens here.
- Uterus (womb): A hollow, muscular organ where the fertilised egg implants and grows into a baby. Its lining thickens each month in preparation for pregnancy.
- Cervix and vagina: The cervix is the lower opening of the uterus; the vagina is the birth canal through which the baby is delivered. …
Here are the answers to your questions regarding the transverse section of the human ovary:
- The hormone that helps in the growth of the ovarian follicles from stage A to B to C is Follicle-Stimulating Hormone (FSH). FSH stimulates the development of primary follicles into mature Graafian follicles.
- The developing ovarian follicles, represented by stages A and B, primarily secrete estrogen. …
Follicle-Stimulating Hormone (FSH) drives follicular growth, while developing follicles secrete estrogen, and the corpus luteum (D) primarily secretes progesterone to prepare and maintain the uterus.
The human ovary is a fascinating organ, central to female reproduction, where eggs develop and hormones are produced. Within the ovary, structures called ovarian follicles undergo a series of developmental changes, culminating in the release of an egg. This entire process, known as oogenesis and the ovarian cycle, is meticulously regulated by various hormones. The diagram you're studying illustrates different stages of these follicles and a post-ovulatory structure.
Let's break down the hormonal control at each stage:
(a) Name the hormone that helps in the growth of A → B → C.
The progression from A to B to C represents the growth and maturation of an ovarian follicle. A typically denotes a primary or early growing follicle, B a secondary follicle, and C a mature Graafian follicle, which is ready to release an egg. This entire developmental journey is primarily stimulated and supported by Follicle-Stimulating Hormone (FSH).
FSH is secreted by the anterior pituitary gland. Its main role is to act on the ovarian follicles, promoting the proliferation of granulosa cells within the follicle and stimulating the synthesis of estrogen. Without adequate FSH, the follicles would not grow and mature properly.
FSH is crucial for the initial recruitment and growth of ovarian follicles.
(b) Name the hormone secreted by A and B.
As the ovarian follicles (A and B) grow under the influence of FSH, the cells within them, particularly the granulosa cells, begin to secrete a crucial steroid hormone: estrogen.
Estrogen levels rise progressively during the follicular phase of the menstrual cycle as the follicles mature. This hormone has several important functions:
- It stimulates the proliferation of the endometrium (the inner lining of the uterus), preparing it for potential implantation.
- It inhibits the secretion of FSH from the anterior pituitary through a negative feedback mechanism.
- At a certain high concentration, it triggers a surge in Luteinizing Hormone (LH) from the anterior pituitary, which is essential for ovulation.
While estrogen is secreted by all growing follicles, the dominant follicle (which will eventually become C) produces the most significant amount.
(c) State the role of the hormone produced by D.
Structure D in the diagram represents the corpus luteum. This temporary endocrine structure forms from the remnants of the Graafian follicle (C) after it ruptures and releases the egg during ovulation. The formation of the corpus luteum is triggered by the LH surge. …
Showing the 12 most recent of 16 on this concept.
- CBSE 2026Set 57/1/11 markMCQQ.Select the option that shows correct statements :(i) Corpus luteum secretes progesterone.(ii) Only FSH attains a peak level in middle of cycle.(iii) LH surge induces rupture of graafian follicle.(iv) Luteal phase of menstrual cycle is also called proliferative phase. Options : (A) Only(ii) is correct. (B)(i) and(iii) are correct. (C) Only(iv) is correct. (D)(ii) and(iv) are correct.
›Reveal solutionSolution
The corpus luteum does secrete progesterone, and the LH surge does trigger ovulation by rupturing the Graafian follicle — making statements (i) and (iii) correct.
The menstrual cycle is a precisely orchestrated hormonal dance, and understanding which hormones do what, and when, is essential to grasping reproductive physiology. Let's examine each statement in turn.
Statement (i): Corpus luteum secretes progesterone.
This is absolutely correct. After ovulation, the ruptured Graafian follicle transforms into the corpus luteum, a temporary endocrine structure in the ovary. The corpus luteum's primary job is to secrete large amounts of progesterone, along with some estrogen. Progesterone prepares the endometrium for implantation by making it thick, vascular, and secretory. If fertilization doesn't occur, the corpus luteum degenerates, progesterone levels drop, and menstruation begins. This is a fundamental fact of the luteal phase.
Statement (ii): Only FSH attains a peak level in middle of cycle.
This is incorrect. While FSH (follicle-stimulating hormone) does rise during the follicular phase to stimulate follicle development, it is not the only hormone that peaks mid-cycle. In fact, the defining hormonal event of mid-cycle is the LH surge — a dramatic spike in luteinizing hormone that occurs around day 14 of a typical 28-day cycle. Both LH and FSH show elevated levels at this time, but the LH surge is far more pronounced and is the direct trigger for ovulation. So the statement that "only FSH" peaks is factually wrong.
Statement (iii): LH surge induces rupture of Graafian follicle.
This is correct. The LH surge is the hormonal signal that causes the mature Graafian follicle to rupture and release the secondary oocyte — the process we call ovulation. Without this surge, ovulation simply does not happen. The LH surge typically occurs about 24–36 hours before ovulation, making it the critical event that marks the transition from the follicular to the luteal phase.
NoteThe LH surge is so reliable that ovulation predictor kits work by detecting elevated LH levels in urine, giving couples a window for conception.
Statement (iv): Luteal phase of menstrual cycle is also called proliferative phase. …
- CBSE 2026Set 57/1/11 markMCQQ.Which connective tissue connects ovary to pelvic wall and uterus ? (A) Tendons (B) Ligaments (C) Cartilage (D) Bone
›Reveal solutionSolution
Ligaments are the connective tissues that anchor the ovary to both the pelvic wall and the uterus, holding the reproductive organs in their proper anatomical positions.
The female reproductive system sits within the pelvic cavity, and like all internal organs, it needs structural support to remain in place during movement, posture changes, and the various physiological processes it undergoes. This is where connective tissues come into play—but not all connective tissues serve the same purpose.
Tendons are specialized connective tissues, but their job is to attach muscle to bone, enabling movement when muscles contract. They have no role in suspending or anchoring organs within body cavities. Cartilage provides cushioning at joints and structural support in places like the nose, ears, and trachea—again, not relevant to holding ovaries in position. Bone forms the rigid framework of the skeleton itself; while the pelvic bones create the cavity that houses the reproductive organs, they don't directly connect to the ovaries.
Ligaments, however, are fibrous connective tissues designed specifically to connect bone to bone or to anchor organs to the body wall. In the female reproductive system, several ligaments perform this anchoring function:
- The ovarian ligament connects each ovary to the lateral wall of the uterus
- The suspensory ligament of the ovary (infundibulopelvic ligament) attaches the ovary to the pelvic wall
- The broad ligament is a fold of peritoneum that helps support the uterus, fallopian tubes, and ovaries …
- CBSE 2026Set A1 markMCQQ.What is the main role of large amount of progesterone secreted by corpus luteum?(a) maintenance of endometrium of uterus(b) maintenance of perimetrium of uterus(c) maintenance of myometrium of uterus(d) None of these
›Reveal solutionSolution
Progesterone from the corpus luteum maintains the uterine endometrium, preparing/keeping it ready for the embryo.
After ovulation, the remaining follicle forms the corpus luteum, which secretes large amounts of progesterone. Progesterone is essential for maintaining the endometrium (the inner lining of the uterus) in a thick, secretory, well-supplied state. This maintained endometrium is necessary for the imp …
- CBSE 2025Set 57/6/11 markMCQQ.Given below are a few statements with respect to spermatogenesis in a human male.(i) Sperms are released from the seminiferous tubules by the process of spermiation.(ii) Spermiogenesis involves the maturation of spermatids into sperms.(iii) Spermatogonia produce spermatids by the process of spermiogenesis.(iv) Meiosis II in secondary spermatocytes results in the formation of four equal haploid spermatids.(v) Primary spermatocyte completes the first meiotic division forming two equal, diploid cells called secondary spermatocytes. Choose the option with all true statements from the given options : (A) (i),(ii) and(iv) (B) (ii),(iii) and(v) (C) (ii),(iv) and(v) (D) (i),(iii) and (iv)
›Reveal solutionSolution
Spermatogenesis involves the transformation of spermatogonia into mature sperms through meiosis and differentiation, culminating in their release from the seminiferous tubules.
Spermatogenesis is the intricate process by which immature male germ cells, called spermatogonia, develop into mature spermatozoa (sperms) within the seminiferous tubules of the testes. This process begins at puberty and continues throughout a male's life, ensuring a continuous supply of gametes for reproduction. It involves a series of mitotic divisions, meiotic divisions, and a final differentiation phase.
Let's break down the key stages and then evaluate the given statements:
- Spermatogonia: These are diploid (2n) undifferentiated germ cells located on the inside wall of the seminiferous tubules. They multiply by mitotic division, increasing their numbers. Some spermatogonia differentiate into primary spermatocytes.
- Primary Spermatocytes: These are also diploid (2n) cells. Each primary spermatocyte then undergoes the first meiotic division (Meiosis I). This is a reductional division, meaning the chromosome number is halved.
- Secondary Spermatocytes: After Meiosis I, each primary spermatocyte forms two equal, haploid (n) cells called secondary spermatocytes. These cells have 23 chromosomes, each with two chromatids.
- Spermatids: Each secondary spermatocyte then rapidly undergoes the second meiotic division (Meiosis II). This is an equational division, similar to mitosis, where sister chromatids separate. As a result, two equal, haploid (n) spermatids are formed from each secondary spermatocyte. Therefore, from one primary spermatocyte, a total of four haploid spermatids are produced.
- Spermiogenesis: This is the process of differentiation where the non-motile, round spermatids are transformed into elongated, motile spermatozoa (sperms). During this phase, the spermatids develop a head, middle piece, and tail.
- Spermiation: After spermiogenesis, the heads of the newly formed sperms become embedded in the Sertoli cells (nurse cells) for nourishment. Once mature, they are finally released from the seminiferous tubules by a process known as spermiation.
Now, let's evaluate each statement:
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(i) Sperms are released from the seminiferous tubules by the process of spermiation.
- This statement is True. As described above, spermiation is the final step where mature spermatozoa are released from the Sertoli cells into the lumen of the seminiferous tubules.
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(ii) Spermiogenesis involves the maturation of spermatids into sperms.
- This statement is True. Spermiogenesis is precisely the morphological transformation and differentiation of haploid spermatids into mature, motile spermatozoa.
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(iii) Spermatogonia produce spermatids by the process of spermiogenesis. …
- CBSE 2025Set ANNUAL1 markMCQQ.Which hormone is secreted in large amount by the "Corpus luteum"?(a) Testosterone(b) Progesterone(c) Prolactin(d) Thyroxine
›Reveal solutionSolution
After ovulation, the ruptured Graafian follicle becomes the corpus luteum, which mainly secretes progesterone.
Once the ovum is released at ovulation, the remnant of the Graafian follicle transforms into a yellowish endocrine structure called the corpus luteum. Its principal secretion is progesterone, which is essential for maintaining the endometrium of the uterus so that it can support implantation and pregnancy if fertilisation occurs. Testosterone is a …
- CBSE 2025Set ANNUAL1 markQ.Note the relationship between the first two words and fill the missing word.(a) Primary sex organ in male : Testes; Primary sex organ in female : _____.(b) Leydig cells : Androgen; Corpus luteum : _____.
›Reveal solutionSolution
Just as the testis (with its Leydig/interstitial cells secreting androgens) is the male primary sex organ, the ovary is the female primary sex organ, and its corpus luteum secretes the hormone progesterone.
This is a word-relationship (analogy) question testing knowledge of the reproductive organs and their hormone-secreting cells.
- (a) The testis is the primary sex organ (gonad) in the male, responsible for producing sperm (gametogenesis) and male sex hormones. Its exact female counterpart — the primary sex organ (gonad) responsible for producing ova and female sex hormones — is the ovary. …
- CBSE 2024Set E1 markMCQQ.Which of the following secretes large amount of progesterone?(a) Graafian follicle(b) Corpus albicans(c) Corpus luteum(d) Primary follicle
›Reveal solutionSolution
The corpus luteum secretes large amounts of progesterone during the luteal phase.
After ovulation, the remaining parts of the ruptured Graafian follicle transform into a yellowish endocrine structure called the corpus luteum. The corpus luteum secretes large amounts of the hormone progesterone, which is essential for maintenance of the endometrium and for preparing it to receive and support a fertilised ovum (implantation and pregnancy).
…
- CBSE 2024Set ANNUAL1 markMCQQ.Which hormone is secreted by Pituitary gland in human female ?(a) LH(b) FSH(c) Oxytocin(d) All of these
›Reveal solutionSolution
LH, FSH and oxytocin are all pituitary hormones involved in female reproduction.
The anterior pituitary (adenohypophysis) secretes the gonadotropins LH and FSH, which regulate ovarian events (follicular development, ovulation and formation/maintenance of the corpus luteum). The posterior pituitary (neurohypophysis) releases oxytocin, which is important during parturition (uterine contractions) and milk ejection during lactation. Since the pitui …
- CBSE 2024Set ANNUAL1 markMCQQ.Match the following and choose the correct option. Column I Column II
- Ovary A) Androgens
- Corpus luteum B) Human Chorionic gonadotropin
- Leydig cells C) Estrogen + Progesterone
- Placenta D) Progesterone only
(a) 1(A), 2(C), 3(B), 4(D)(b) 1(C), 2(D), 3(A), 4(B)(c) 1(B), 2(A), 3(C), 4(D)(d) 1(A), 2(B), 3(D), 4(C)›Reveal solutionSolution
Ovary → Estrogen + Progesterone, Corpus luteum → Progesterone only, Leydig cells → Androgens, Placenta → hCG, which gives option (b) 1(C), 2(D), 3(A), 4(B).
Matching each source to its principal secretion:
- Ovary — its follicles secrete both estrogen and progesterone, the two chief female sex hormones (option C).
- Corpus luteum — the structure formed from the ruptured Graafian follicle after ovulation; it secretes mainly progesterone to maintain the uterine lining for a possible pregnancy (option D). …
- CBSE 2023Set 57/1/11 markMCQQ.In which one of the following options does the endocrine gland correctly match with its hormonal secretion and its function ? Endocrine Gland Hormone Function(a) Sertoli cells Testosterone Development of secondary sexual characteristics(b) Placenta Estrogen Initiates secretion of milk(c) Leydig cells Androgen Initiates the production of sperms(d) Ovary FSH Stimulates follicular development
›Reveal solutionSolution
The correct match is (c) Leydig cells – Androgen – Initiates the production of sperms, as per NCERT.
To understand why this is the right answer, we need to look at what each gland actually secretes and what that hormone does in the body. The question tests your grasp of the male and female reproductive systems and the specific roles of different endocrine structures.
Let’s start with the male reproductive system. The testes have two important cell types: Leydig cells and Sertoli cells. Leydig cells, also called interstitial cells, are found in the spaces between the seminiferous tubules. Their job is to secrete androgens — the most important of which is testosterone. Androgens are male sex hormones. Their functions are many: they stimulate the development of male secondary sexual characteristics (like facial hair, deepening of the voice, and muscle growth), they maintain the male reproductive organs, and crucially, they are essential for spermatogenesis — the production of sperm. So option (c) is correct: Leydig cells secrete androgen, and one of its key functions is to initiate sperm production.
Now, look at option (a): Sertoli cells and testosterone. This is a common confusion. Sertoli cells are also inside the seminiferous tubules, but they do not secrete testosterone. Instead, they provide nourishment to the developing sperm cells and secrete a hormone called inhibin, which regulates FSH secretion. Testosterone comes from Leydig cells, not Sertoli cells. So (a) is wrong.
Option (b) involves the placenta, estrogen, and milk secretion. The placenta does secrete estrogen, but estrogen’s role in lactation is indirect. Estrogen helps in the development of the mammary glands during pregnancy, but the actual initiation of milk secretion (lactation) is triggered by a different hormone — prolactin, which is secreted by the anterior pituitary. So the function given here is incorrect. …
- CBSE 2023Set 57/3/11 markMCQQ.Which of the following options correctly matches the name of the hormone to its site of production in the human body ? Name of the Hormone / Site of Production P. Oxytocin i. Placenta Q. Relaxin ii. Corpus Luteum R. hCG iii. Pituitary Gland S. Progesterone iv. Ovaries(a) P-i, Q-iii, R-ii, S-iv(b) P-i, Q-iv, R-iii, S-ii(c) P-iii, Q-iv, R-i, S-ii(d) P-ii, Q-iii, R-i, S-iv
›Reveal solutionSolution
This question tests knowledge of hormone production sites. Oxytocin is from the Pituitary Gland, Relaxin from the Ovaries, hCG from the Placenta, and Progesterone from the Corpus Luteum, making option (c) the correct match.
Understanding the specific glands or tissues responsible for producing each hormone is fundamental to endocrinology. Hormones are chemical messengers, and their precise origin dictates their role in regulating various physiological processes. Knowing the primary site of production helps in understanding the context of their action and their importance in maintaining homeostasis or facilitating specific events like reproduction.
Here's a step-by-step breakdown of each hormone and its production site:
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Oxytocin (P):
- Oxytocin is a peptide hormone primarily known for its role in childbirth (stimulating uterine contractions) and lactation (milk ejection reflex).
- It is synthesized in the hypothalamus but stored and released by the posterior Pituitary Gland (iii).
- Therefore, P matches with iii.
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Relaxin (Q):
- Relaxin is a peptide hormone that helps relax the ligaments in the pelvis and soften the cervix during childbirth. It also plays a role in angiogenesis and renal hemodynamics.
- It is primarily produced by the corpus luteum in the Ovaries (iv), and also by the placenta and uterus. Since the corpus luteum is located within the ovary, "Ovaries" is a correct and encompassing site of production.
- Therefore, Q matches with iv.
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hCG (human Chorionic Gonadotropin) (R):
- hCG is a glycoprotein hormone crucial in early pregnancy. It maintains the corpus luteum, ensuring continued production of progesterone, which is vital for maintaining the uterine lining.
- It is produced by the syncytiotrophoblast cells of the developing embryo after implantation, and later by the Placenta (i). This is why hCG is detected in pregnancy tests.
- Therefore, R matches with i.
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Progesterone (S): …
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- CBSE 2022Set ANNUAL1 markMCQQ.Which of these is not a secondary sex organ?(a) Oviduct(b) Ova(c) Vas deferens(d) Penis
›Reveal solutionSolution
Primary sex organs (testis/ovary) produce gametes; secondary sex organs are the accessory ducts/glands that transport and support them — ova is a gamete, not an organ.
- Primary sex organs are the gonads — testis in males, ovary in females — which produce gametes (sperm, ova) and secrete sex hormones. …
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