All Free Biology MCQs with Answers

• A. Urethra
• B. Sperm dust
• C. Pancreas
• D. Testes

Explanation: The testes are the male reproductive organs responsible for producing sperm through a process called spermatogenesis.

• A. Ovulation
• B. Menstruation
• C. Oestrous
• D. All of these

Explanation: The process of discharge of ovum Is called ovulation. In human only one ovum is usually discharged from the ovary at one time, this…

• A. Fallopian tube
• B. Uterine tube
• C. Both Options A and B are correct
• D. Uterus

Explanation: The oviduct is generally called fallopian tube or uterine tube.The fallopian tubes are a pair of long, thin tubes that connect the ovaries…

• A. Zygote
• B. Foetus
• C. Embryo
• D. All of these options are correct

Explanation: After the 3rd month of pregnancy, the implanted zygote is referred to as the fetus.

• A. 8.5 hours
• B. 10 hours
• C. 14 hours
• D. 15.5 hours

Explanation: The cocklebur, Xanthium strumarium, is a short-day plant that begins to flower in the late summer and fall, when day length no longer…

• A. Death
• B. Shedding of uterine wall
• C. Menopause
• D. Formation of Corpus Luteum

Explanation: The secretory phase, also known as the post-ovulatory phase, is the third phase of the menstrual cycle.

• A. 10-15 minutes
• B. 20-30 minutes
• C. 60 minutes
• D. 10-45 minutes

Explanation: Afterbirth is the delivery of the placenta which follows the delivery of the baby. It occurs 10 to45 minutes after the baby is born.

• A. Seminiferous tubules
• B. Urinogenital duct
• C. Seminal Vesicles
• D. Vasa efferentia

Explanation: Vasa efferentia is the correct answer. The vasa efferentia are a series of ducts that connect the rete testis (a network of tubules within…

• A. Progesterone
• B. Lactin
• C. Oestrogen
• D. Oxytocin

Explanation: Oestrogen (Estrogen) is the correct answer. FSH stimulates the ovary to produce estrogen (also spelled as oestrogen).

• A. HIV
• B. Treponema pallidum
• C. Neisseria gonorrhoeae
• D. Type '2' virus

Explanation: Syphillis is caused by the bacterium Treponema Pallidum.HIV causes AIDS.

• A. Proliferative phase
• B. Menstrual phase
• C. Secretory phase
• D. Ovulation phase

Explanation: From day 14 to day 28 of the menstrual cycle (secretory phase) Progesterone thickens endometrium in preparation for possible fertilization…

• A. HIV / AIDS
• B. Pseudomonas Pyogenes
• C. Treponema Pallidum
• D. Neisseria

Explanation: The bacteria responsible for causing syphilis is treponema pallidum.

• A. Fertilization
• B. Pollination
• C. Follicle formation
• D. Ovulation

Explanation: Ovulation is the process of release or discharge of ovum or secondary oocyte from the Graffian follicle after maturation of the Graffian…

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

Explanation: Until fertilization, the secondary oocyte stops at the metaphase. After fertilization, it completes meiosis and forms a mature oocyte and…

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

Explanation: Spermatids are haploid cells that result from the second meiotic division of secondary spermatocytes.

• A. Interstitial Cells
• B. Germ Cells
• C. Sertoli Cells
• D. Spermatocytes

Explanation: In the testes, interstitial cells are present in the connective tissue surrounding the sperm producing tubules, and are respnsible for the…

• A. Increase in the level of LH
• B. Decrease in the level of progesterone
• C. Increase in the level of FSH
• D. Increase in the level of estrogen

Explanation: If fertilization doesn't occur, the corpus luteum starts to degenerate, leading to a decrease in progesterone production.

• A. Both Uterus and Cervix
• B. Cervix
• C. Uterus
• D. Ovary

Explanation: Oogonia are produced by primordial germ cells during fetal development, in large numbers in the ovary.

• A. Cessation of oogenesis
• B. Breakdown of oocytes
• C. Ovulation
• D. Development of zygote

Explanation: Luteinizing hormone (LH) is a hormone produced by the anterior pituitary gland.

• A. Anaphase I
• B. Prophase I
• C. Metaphase I
• D. Metaphase II

Explanation: When a female ovulates the secondary oocyte is in metaphase II. It then completes the second phase of meiosis to make a mature ovum only…