Biology

Human Reproductive System

751 Questions

The human reproductive system covers the anatomy of reproductive organs, gamete production, fertilization processes, and reproductive technologies. This is a highly scoring area in biology sections of competitive exams. Use these questions to practice key concepts.

Fertilization processGamete productionReproductive organ functionsAssisted reproductive technology

Human Reproductive System Questions

Multiple choice

Syngamy is

  1. fusion of cytoplasm of sperm and ovum

  2. fusion of nuclei of sperm and ovum

  3. fusion of two adult individuals

  4. conjugation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Syngamy is the fusion of the nuclei of sperm and ovum (male and female gametes). This nuclear fusion is the key event in fertilization, combining genetic material from both parents. Option A describes cytoplasmic fusion which may accompany but doesn't define syngamy. Option C is incorrect (syngamy is cellular, not organismal). Option D describes conjugation, a different process in some microorganisms.

Multiple choice

Which of the following statements is true regarding the sexual reflexes and fertilization in humans?

  1. Erection in males is a sympathetic reflex.

  2. During ejaculation, the sperms are mixed with secretions from the prostate and seminal vesicles.

  3. In females, the fertilization occurs in the uterus.

  4. Fertilization may occur two or more days after ovulation.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Semen is a viscous whitish secretion of the male reproductive organs during ejaculation containing spermatozoa and consisting secretions of the testes, seminal vesicles, prostate, and bulbourethral glands.

Multiple choice

Which of the following statements characterises the sexual reproduction in humans?

  1. A mature human sperm contains a complete set of chromosomes.

  2. Primary spermatocytes divide by mitosis to give rise to spermatids.

  3. At parturition, an ovary contains all the oocytes it will ever have.

  4. The sperm is known as male zygotes.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer. At birth, a human ovary contains about 2,00,000 eggs. They are enclosed in a single layer of cells called the primordial follicles. The ovaries do not produce any more egg. Women are born with all of the eggs they ever have.

Multiple choice

Which among the following characterises the events taking place in the testis?

  1. Sertoli cells allow the unrestrained diffusion of water-soluble substances between the seminiferous tubules and the blood.

  2. Leydig cells secrete testosterone

  3. Sertoli cells reciprocate to testosterone by synthesising androgen binding protein.

  4. Sertoli cells line the seminiferous tubules and boost the developing sperm in males.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As a consequence of stimulation with luteinizing hormone, the interstitial cells (Leydig) secrete testosterone into the intertubular tissue, where it is absorbed by blood vessels, lymphatics, and the seminiferous tubules.

Multiple choice

Which of the following can form ejaculatory duct?

  1. Gonad

  2. Vas deferens

  3. Ductus deferens

  4. Wolffian duct

  5. Mullerian duct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The mesonephric duct also known as wolffian duct is a paired organ found in mammals including humans during embryogenesis.

Multiple choice

How do sperms move for fertilization with ova?

  1. Cilia on the cell surface of sperms helps in the movement.

  2. Sperms are not motile.

  3. Being streamlined, sperms swim faster with the flagella

  4. Move randomly with flagella to fertilize sooner

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sperm cells are streamlined and propel themselves using a flagellum (tail) that whips in a coordinated manner to swim toward the egg. Option C is correct. Option A is incorrect because sperm have a single flagellum, not cilia. Option B is false - sperm are highly motile cells designed specifically to reach the egg.