All Free Biology MCQs with Answers

• A. Seminal vesicles
• B. Scrotum
• C. Testes
• D. Epididymis
• E. Vasa deferentia

Explanation: The epididymis is a coiled tube located at the back of each testis. Its primary function is to store and mature sperm produced in the…

• A. Azoospermia
• B. Obstruction
• C. Oligospermia
• D. Zoospermia
• E. Ejaculation disorder

Explanation: Azoospermia is a medical condition characterized by the absence of sperm in a man's semen.

• A. FSH
• B. ACTH
• C. DHT
• D. LH
• E. TSH

Explanation: Luteinizing Hormone (LH) is a key hormone in the reproductive system. In females, it triggers ovulation and helps form the corpus luteum…

• A. Selection
• B. Acclimatization
• C. Hybridization
• D. Evolution
• E. Back crossing

Explanation: Hybridization is the process of crossing two different species or varieties to produce a hybrid organism that typically exhibits traits…

• A. Skin cancer
• B. Lung cancer
• C. Blood cancer
• D. Lymph cancer
• E. Testicular cancer

Explanation: Testicular cancer primarily affects younger men, with the highest incidence occurring in those between the ages of 15 and 35.

• A. Ovaries
• B. Oviduct
• C. Cervix
• D. Seminiferous tubules

Explanation: Seminiferous tubules are coiled structures located within the testes and are the site of sperm production (spermatogenesis) in males.

• A. Oocyte
• B. Sperms
• C. Polar body
• D. Spermatogonia

Explanation: Sertoli cells secrete testicular fluid into the seminiferous tubules, providing a liquid medium that supports sperm development.

• A. Testosterone
• B. Follicle stimulating hormone
• C. Luteinizing hormone
• D. Progesterone

Explanation: Progesterone is a steroid hormone produced primarily by the corpus luteum in the ovaries after ovulation and, during pregnancy, by the…

• A. Follicles reach maximum size
• B. Follicle degenerates
• C. Graafian follicle ovulates
• D. The follicle starts to mature

Explanation: The follicle that is not selected for ovulation begins to break down. The oocyte and surrounding granulosa cells undergo apoptosis…

• A. Transport sperms
• B. Connect with urethra
• C. Produce semen
• D. Hold the process of spermatogenesis

Explanation: During ejaculation, sperms are transported from the epididymis through the vas deferens and into the urethra for expulsion.

• A. Secondary spermatocyte
• B. Spermatids
• C. Primary spermatocytes
• D. Sperms

Explanation: Primary spermatocytes are diploid cells in the testes formed from spermatogonia.

• A. Epididymis
• B. Interstitial cells
• C. Seminiferous tubules
• D. Sertoli cells

Explanation: Seminiferous tubules are tightly coiled structures located within the testes, and they are the site of spermatogenesis, the process of…

• A. Oogonia
• B. Ovum
• C. Primary oocytes
• D. Secondary oocytes

Explanation: Primary oocytes are the initial cells in oogenesis that pause in prophase I until puberty.

• A. After 6 days of start of menstruation
• B. After 10 days of start of menstruation
• C. After 14 days of start of menstruation
• D. After 27 days of start of menstruation

Explanation: Ovulation in a typical 28-day menstrual cycle occurs around day 14. It marks the release of a mature egg from the ovary, triggered by a…

• A. Gonorrhea
• B. Influenza
• C. Tuberculosis
• D. Cholera

Explanation: Gonorrhoea is a sexually transmitted infection (STI) caused by the bacterium Neisseria gonorrhoeae. It can be spread through:1.

• A. Androgen
• B. Prostaglandins
• C. Oxytocin
• D. Testosterone

Explanation: These lipid compounds, present in semen, help stimulate contractions in the female reproductive tract, particularly in the uterus and…

• A. Cowper's gland
• B. Prostate gland
• C. Seminal vesicle
• D. Vas deferens

Explanation: The Cowper's glands, also known as bulbourethral glands, produce a clear, alkaline mucus-like fluid that helps neutralize the acidity of…

• A. Graafian follicle
• B. Ovum
• C. Oogonium
• D. Oocyte

Explanation: The Graafian follicle plays a crucial role in ovulation, and its transformation into the corpus luteum is vital for hormonal regulation…

• A. Endometrium
• B. Myometrium
• C. Mesometrium
• D. Perimetrium

Explanation: The perimetrium is the outermost layer of the uterus, also known as the serosa.

• A. Males
• B. Females
• C. Hermaphrodite
• D. None of the above

Explanation: In diploid parthenogenesis, females develop from unfertilized diploid eggs.