All Free Biology MCQs with Answers

• A. HIV / AIDS
• B. Pseudomonas pyogenes
• C. Treponema palladium
• D. Neisseria

Explanation: Syphilis is a sexually transmitted disease caused by the bacterium Treponema pallidum. Hence, option C is correct.

• A. Metaphase
• B. Prophase
• C. Anaphase
• D. Telophase

Explanation: In the secondary meiotic division (also known as meiosis II), the secondary oocyte proceeds as far as the metaphase stage.

• A. Primary spermatoeyte
• B. Secondary spermatocyte
• C. Spermatogonia
• D. Spermatid

Explanation: Spermatids undergo a process called spermiogenesis to differentiate into mature sperm cells (spermatozoa), involving structural changes to…

• A. Cervix
• B. Fallopian tube
• C. External genitellia
• D. Vulva

Explanation: The uterus opens into the vagina through the cervix. The cervix is a cylindrical neck of tissue that connects the uterus to the vagina.

• A. AIDS
• B. Genital herpes
• C. Syphilis
• D. Gonorrhea

Explanation: Treponema pallidum is a bacterium that causes syphilis, a sexually transmitted infection (STI).

• A. Seminiferous
• B. Vas deferens
• C. Ejaculatory duct
• D. Urethra

Explanation: The main duct of the male reproductive tract is the vas deferens, also known as the ductus deferens.

• A. Urinogenital duct
• B. Sperm duct
• C. Ejaculatory duct
• D. Vas deferens

Explanation: The urinogenital duct is a term that refers to the passage of urine (from the urinary system) and sperm (from the reproductive system)…

• A. Secondary oocyte
• B. Primary oocytes
• C. Infinite oogonia
• D. Few oogonia

Explanation: Oogonia divide mitotically to form primary oocytes. Oogonia are diploid cells that are found in the ovaries of female mammals.

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

Explanation: At the time of birth, a female has about 1-2 million primary oocytes in her ovaries.

• A. Life cycle
• B. Menstrual cycle
• C. Nitrogen cycle
• D. Uterine cycle

Explanation: The menstrual cycle is part of both the ovarian and uterine cycles, but it is not the same thing as either of them.

• A. Sperm duct
• B. Epididymal tubules
• C. Ejaculatory duct
• D. Urethra

Explanation: The proximal part of the vas deferens, also known as the epididymis, forms highly convoluted structures called epididymal tubules.

• A. 4 and 16
• B. 4 and 8
• C. 8 and 16
• D. 32 and 16

Explanation: In spermatogenesis, each meiosis cycle produces 4 spermatids. To form 32 spermatids, 8 meiosis cycles are required.

• A. Organic diseases
• B. Genetic diseases
• C. Sexually transmitted diseases
• D. Congenital diseases

Explanation: Sexually transmitted diseases (STDs), also referred to as sexually transmitted infections (STIs), are infections that can be spread…

• A. Zona pellucida
• B. Corona radiata
• C. Chorioallantois
• D. Amnion

Explanation: The outermost layer of a newly ovulated ovum is called the corona radiata.

• A. Maturation of follicle
• B. Formation of early corpus Iuteum
• C. Regression of corpus luteum
• D. Development of follicle

Explanation: Ovulation occurs before the luteal phase of the ovarian cycle.The ovarian cycle is a monthly cycle that prepares the body for pregnancy.

• A. Cowper's gland
• B. Sertoli cells
• C. Seminal vesicle
• D. Leydig Cells

Explanation: The secretion of the Sertoli cells in the seminiferous tubules of the testes converts spermatids into sperm.The Sertoli cells are a type…

• A. Seminiferous tubules
• B. Prostate gland
• C. Interstitial cells
• D. Vas deferens

Explanation: Seminiferous tubules are tiny, coiled tubes found in the testes.They are the site of sperm production.Each testis contains about 800…

• A. Seminiferous tubules
• B. Epididymis
• C. Vas deferens
• D. Seminal vesicles

Explanation: Mature sperms are stored in the epididymis. The epididymis is a long, coiled tube that is attached to the back of each testis.

• A. Follicle
• B. Interstitial cells
• C. Endometrium
• D. Oviduct

Explanation: When a mature egg leaves the ovary, it enters the fallopian tube. The fallopian tubes are two long, thin tubes that extend from the…

• A. Bladder
• B. Uterus
• C. Vagina
• D. Oviduct

Explanation: The endometrium is the lining of the uterus. It is a layer of tissue that is rich in blood vessels and glands.