All Free Biology MCQs with Answers

• A. All the three walls
• B. Perimetrium
• C. Myometirum
• D. Endometrium

Explanation: From day 6-28 of the menstrual cycle, the repair and thickening of the endometrial lining occur.

• A. Serotonin
• B. Estrogen
• C. Progesterone
• D. Insulin

Explanation: After fertilization and the formation of a zygote, the developing embryo starts producing hCG.

• A. Bleeding phase
• B. Secretory phase
• C. Pre-ovulatory phase
• D. Proliferative phase

Explanation: The secretory phase is part of the menstrual cycle and occurs after ovulation.

• A. X
• B. 2X
• C. Y
• D. XY

Explanation: To form a female zygote, the sperm cell must contribute a sex chromosome carrying an X chromosome.

• A. Ovulation
• B. Implantation
• C. Conception
• D. Menstruation

Explanation: After fertilization, the zygote undergoes a series of cell divisions, forming a structure known as a blastocyst.

• A. Interstitial fluid
• B. Semen
• C. Amniotic fluid
• D. Both A and B

Explanation: The fluid secreted by three sets of glands that combines with sperm to form semen includes contributions from the seminal vesicles…

• A. Follicular cycle
• B. Oestrous cycle
• C. Luteal cycle
• D. Menstrual cycle

Explanation: In mammals that are seasonal breeders, females are receptive to mating only once a year during a specific period.

• A. Meiosis
• B. Fertilization
• C. Ovulation
• D. Oogenesis

Explanation: The term that refers to the formation of egg cells (ova) that begins in the developing ovaries of a female fetus is "oogenesis." Oogenesis…

• A. Produced by separation of two blastomeres
• B. Produced asexually
• C. Produced when embryo is at two cell stage
• D. Have different genetic makeup

Explanation: Option D is correct as the genetic material of identical twins is always same not different.

• A. The lining of the womb wall stays built up
• B. The lining of the womb wall builds up again
• C. Another egg is immediately released
• D. The lining of the womb wall breaks down

Explanation: During the menstrual cycle, if a released egg does not become fertilized, the lining of the womb wall breaks down.

• A. Egg
• B. Ova
• C. Ovum
• D. All of these options are correct

Explanation: Female gametes are most commonly referred to as eggs or ova (singular: ovum).

• A. Penis
• B. Urethra
• C. Seminal vesicles
• D. Ureter

Explanation: The urethra is a duct that serves as a common passage for both urine from the bladder and semen (containing sperm) from the reproductive…

• A. Fallopian tube
• B. Ovary
• C. Cervix
• D. Vagina

Explanation: The structure that carries the egg from the ovary to the uterus is the fallopian tube, also known as the oviduct.

• A. Shoulders broaden
• B. Breasts enlarge
• C. Eggs start producing
• D. Womb grows bigger

Explanation: The correct answer is Shoulders broaden because while some physical changes occur during puberty, broadening of the shoulders is not a…

• A. Ovulation
• B. Beginning of menses
• C. Corpus luteum formation
• D. Maturation of ovarian follicle

Explanation: Progesterone is the primary hormone in the maintenance of the endometrium lining.

• A. Penis
• B. Seminal vesicles
• C. Prostate gland
• D. Sperm duct

Explanation: The tube that carries sperm from the testes to the urethra is called the vas deferens.

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: Each primary spermatocyte undergoes two rounds of meiotic division, known as meiosis I and meiosis II.

• A. Oogonia
• B. Spermatogonia
• C. Ovogonia
• D. Ovum

Explanation: In the seminiferous tubules of the testes, the repeated division of the germinal epithelium (the cells that give rise to sperm) through a…

• A. Ovulation
• B. Fertilization
• C. Menstruation
• D. Implantation

Explanation: The release of the ovum (egg) from the follicle in human females is called ovulation.

• A. Sporulation
• B. Fission
• C. Apomixis
• D. All of these options are correct

Explanation: Asexual reproduction is a type of reproduction that involves only one parent, and the offspring produced are genetically identical to the…