This MCQ module is based on: Male Reproductive System
TOPIC 5 OF 64
Male Reproductive System
🎓 Class 12
Biology
CBSE
Theory
Ch 2 – Human Reproduction
⏱ ~14 min
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Chapter 2 — Human Reproduction (Part 1): The Male Reproductive System
Humans are and . Reproductive events in human male and female include the formation of gametes (gametogenesis), insemination, fertilisation, implantation, embryonic development, and parturition (childbirth). In this part, we explore the structure and function of the male reproductive system.
3.1 The Male Reproductive System
The male reproductive system is located in the pelvis region. It consists of a pair of , accessory ducts, accessory glands, and the external genitalia.
3.1.1 The Testes
The testes are situated outside the abdominal cavity within a pouch called the . The scrotum maintains the temperature of the testes at about 2-2.5 °C lower than the normal internal body temperature, which is necessary for .
Each testis is oval in shape, about 4-5 cm long and 2-3 cm wide. It is covered by a dense covering. Internally, each testis is divided into about 250 compartments called testicular lobules. Each lobule contains one to three highly coiled in which sperms are produced.
3.1.2 Inside the Seminiferous Tubule
Each seminiferous tubule is lined on its inside by two types of cells:
- Male germ cells (): These divide and differentiate to form sperms.
- : These provide nutrition to the developing germ cells.
The regions outside the seminiferous tubules, called interstitial spaces, contain small blood vessels and groups of . Leydig cells synthesise and secrete testicular hormones called androgens, principally . Other immunologically competent cells are also present in the interstitial space.
3.1.3 Accessory Ducts
The male sex accessory ducts include the rete testis, vasa efferentia, epididymis and vas deferens. The seminiferous tubules of the testis open into the through rete testis. The vasa efferentia leave the testis and open into the located along the posterior surface of each testis.
The epididymis leads to the that ascends into the abdomen and loops over the urinary bladder. It receives a duct from the and opens into the urethra as the ejaculatory duct. These ducts store and transport the sperms from the testis to the outside through the urethral opening.
The originates from the urinary bladder, extends through the penis to its external opening called the urethral meatus.
3.1.4 The Penis
The is the male external genitalia. It is made up of special tissue (erectile tissue) that helps in erection of the penis to facilitate insemination. The enlarged end of the penis called the glans penis is covered by a loose fold of skin called the foreskin.
3.1.5 Accessory Glands
The male accessory glands include paired seminal vesicles, a single prostate, and paired bulbourethral glands. Their secretions together with sperms form the . The secretion of the bulbourethral glands also helps in the lubrication of the penis.
| Accessory Gland | Number | Secretion / Function |
|---|---|---|
| Seminal vesicles | Pair | Fructose-rich fluid for sperm energy; contributes ~60% of semen volume. |
| Prostate gland | Single | Slightly alkaline secretion that activates sperm and neutralises vaginal acidity. |
| Bulbourethral (Cowper's) glands | Pair | Lubricating mucus secretion; aids penile lubrication during coitus. |
3.1.6 Hormonal Regulation
Hormonal regulation of the male reproductive system involves the hypothalamus, anterior pituitary and the testis. The hypothalamus releases GnRH (Gonadotropin Releasing Hormone) which acts on the anterior pituitary to release two gonadotropins:
- : acts on Sertoli cells and stimulates secretion of factors that help in spermiogenesis.
- : acts on Leydig cells and stimulates synthesis and secretion of androgens (mainly testosterone).
Androgens then stimulate the process of spermatogenesis. They also regulate the development, maturation and functions of the male accessory sex organs and the expression of male secondary sexual characters (deepening of voice, growth of facial and body hair, muscle development, etc.).
Interactive: Male Hormone Pathway Explorer
Click each pathway step to see the hormone and its target.
Hypothalamus releases GnRH, which acts on the anterior pituitary.
3.1.7 Worked Examples
Example 1 — Why are testes located outside the abdominal cavity?
Answer: The scrotum maintains the testes at about 2-2.5 °C below normal body temperature. This lower temperature is essential for the normal process of spermatogenesis. At core body temperature, sperm production is impaired, which is why retention of testes inside the abdomen (cryptorchidism) leads to sterility.
Example 2 — Function of Sertoli cells vs Leydig cells
Answer: Sertoli cells lie inside the seminiferous tubules and provide nutrition to developing germ cells; they are stimulated by FSH and secrete inhibin. Leydig cells (interstitial cells) lie outside the seminiferous tubules in the interstitium; stimulated by LH, they secrete androgens (mainly testosterone) responsible for spermatogenesis and male secondary sexual characters.
Example 3 — Trace the path of sperm from formation to release
Answer: Seminiferous tubule → Rete testis → Vasa efferentia → Epididymis (maturation/storage) → Vas deferens → joins duct of seminal vesicle to form Ejaculatory duct → Urethra → Urethral meatus.
Activity 3.1 — Build the Male Reproductive Pathway
Predict: Arrange the following structures in the correct order from sperm formation to release: Vas deferens, Urethra, Seminiferous tubule, Epididymis, Ejaculatory duct, Rete testis, Vasa efferentia.
Observe: Seminiferous tubule → Rete testis → Vasa efferentia → Epididymis → Vas deferens → Ejaculatory duct → Urethra.
Explain: Sperms are formed in the seminiferous tubules, mature in the epididymis (giving them motility), and are propelled through the vas deferens during ejaculation. The vas deferens joins the seminal vesicle duct to form the ejaculatory duct, which empties into the urethra for delivery via the penis.
Competency-Based Questions
Q1. Which type of cells in the testis secrete testosterone? L1 Remember
(a) Sertoli cells (b) Spermatogonia (c) Leydig cells (d) Mast cells
(a) Sertoli cells (b) Spermatogonia (c) Leydig cells (d) Mast cells
(c) Leydig cells lie in the interstitial space and secrete androgens (testosterone) on stimulation by LH.
Q2. The scrotum maintains the testes at about ____ °C below normal body temperature. L1 Remember
2-2.5 °C below. This lower temperature is essential for spermatogenesis.
Q3. Explain how Sertoli cells support spermatogenesis. L2 Understand
Sertoli cells line the seminiferous tubule and act as nurse cells that provide nutrients, structural support, and growth factors to differentiating germ cells. Stimulated by FSH, they secrete factors that promote spermiogenesis and form the blood-testis barrier protecting developing sperm.
Q4. If the vas deferens of a man is surgically cut and tied (vasectomy), explain whether semen will still be released and whether sperm will be present. L3 Apply
Yes, semen is still released because the secretions of seminal vesicles, prostate and bulbourethral glands (which form ~95% of semen volume) reach the urethra normally. However, sperms cannot travel from the epididymis to the urethra, so the ejaculate will be sperm-free, rendering the man infertile while preserving sexual function.
Q5. Compare the contributions of seminal vesicles, prostate and bulbourethral glands to semen composition and function. L4 Analyse
Seminal vesicles: largest contribution (~60%); fructose for sperm energy. Prostate: alkaline secretion neutralises acidic vaginal environment and activates sperm. Bulbourethral: pre-ejaculate mucus that lubricates the urethra/penis and clears acidic urine residue. Together they form the medium that nourishes, activates and transports sperm.
Assertion–Reason Questions
Choose: (A) Both A and R are true and R is the correct explanation of A. (B) Both A and R are true but R is NOT the correct explanation of A. (C) A is true, R is false. (D) A is false, R is true.
Q1. Assertion (A): Testes are located outside the abdominal cavity in the scrotum.
Reason (R): Spermatogenesis requires a temperature 2-2.5 °C below normal body temperature.
Reason (R): Spermatogenesis requires a temperature 2-2.5 °C below normal body temperature.
(A) Both true; R correctly explains A.
Q2. Assertion (A): LH stimulates Leydig cells to secrete testosterone.
Reason (R): Leydig cells are found inside the seminiferous tubules.
Reason (R): Leydig cells are found inside the seminiferous tubules.
(C) A is true; R is false — Leydig cells are in the interstitial spaces outside seminiferous tubules.
Q3. Assertion (A): Vasectomy is an effective male contraceptive method.
Reason (R): Cutting the vas deferens prevents sperms from entering the ejaculate.
Reason (R): Cutting the vas deferens prevents sperms from entering the ejaculate.
(A) Both true; R correctly explains A. Hormone production and ejaculation continue normally; only sperm transport is blocked.
Frequently Asked Questions - Male Reproductive System
What is the main concept covered in Male Reproductive System?
In NCERT Class 12 Biology Chapter on Human Reproduction, "Male Reproductive System" covers the core biological structures, processes, and pathways students need for board exam success. The MyAiSchool lesson explains the topic with definitions, labelled diagrams, comparison tables, and interactive simulations. Scientific terminology and physiological/genetic significance are highlighted throughout to build conceptual depth aligned with CBSE 2025-26 syllabus.
How is Male Reproductive System useful in real-life or applied biology?
Real-life applications of "Male Reproductive System" from NCERT Class 12 Biology Human Reproduction include medical diagnostics, agriculture, biotechnology, public health, evolutionary insights, and ecological monitoring. The MyAiSchool lesson links every biological concept to a tangible application so students see biology as a problem-solving framework for living systems and real-world challenges.
What are the key terms students should memorize for Male Reproductive System?
Key terms in "Male Reproductive System" (NCERT Class 12 Biology Human Reproduction) are tabulated in the MyAiSchool key-terms grid. Students should memorize each term with its precise definition, function, and example. Terminology is high-yield in CBSE board exams — 1-mark MCQs and 2-mark short answers test definitions directly. The Summary section provides a printable quick-reference card.
How does this part connect to other parts of the chapter?
NCERT Class 12 Biology Human Reproduction is structured so each part builds biological understanding sequentially. "Male Reproductive System" connects to neighbouring parts via shared mechanisms, structural hierarchies, and physiological processes. The MyAiSchool lesson cross-references related concepts with internal links so students can navigate the whole chapter as one connected biological story rather than disconnected fragments.
What types of CBSE board questions come from Male Reproductive System?
CBSE board questions from "Male Reproductive System" typically include: (1) 1-mark MCQs on definitions and processes, (2) 2-mark short-answer differences/comparisons, (3) 3-mark labelled-diagram questions, (4) 5-mark long-answer essays combining mechanism + diagram + significance. The MyAiSchool lesson tags each Competency-Based Question (CBQ) with Bloom level (L1-L6) so students know how to study for each weight.
How can students use the interactive simulation effectively?
The interactive simulation in the "Male Reproductive System" lesson allows students to explore biological processes, classifications, or pathways using selectors and sliders, with live visual feedback. To use it effectively: (1) explore each option/state, (2) compare with textbook diagrams, (3) note the function/outcome changes, (4) try the integrated practice quiz. The simulation reinforces visual-spatial understanding that pure text-based study cannot.
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