All Free Biology MCQs with Answers

• A. Aphids
• B. Mosquito
• C. Butterfly
• D. Honeybee

Explanation: In honeybees, males (also known as drones) are haploid, meaning they have only one set of chromosomes.

• A. Seminal vesicles
• B. Bulbourethral glands
• C. Prostate gland
• D. All of these options are correct

Explanation: The glands that contribute to the production of semen in males are the seminal vesicles, the prostate gland, and the bulbourethral glands…

• A. Haploid sporophyte and diploid gametophyte generations
• B. Diploid sporophyte and diploid gametophyte generations
• C. Haploid sporophyte and haploid gametophyte generations
• D. Haploid gametophyte and diploid zygotic phase only

Explanation: In sexual reproduction, plants exhibit different life cycles, and one common type is the diplohaplontic life cycle, also known as the…

• A. Exchange oxygen
• B. Exchange carbon dioxide
• C. Exchange nutrients
• D. All of these

Explanation: The placenta plays a crucial role in the exchange of oxygen, carbon dioxide, and nutrients between the maternal and fetal circulations…

• A. Scrotum
• B. Seminiferous tubules
• C. Prepuce
• D. Epididymis

Explanation: The epididymis is a highly convoluted tube located on the surface of each testis.

• A. Fluid and Sperms
• B. Blood and Water
• C. Blood and Sperms
• D. Blood and Fluid

Explanation: Semen refers to the fluid that is ejaculated from the penis during male reproduction.

• A. Maintenance of the corpus luteum
• B. Formation of the placenta
• C. Blastocyst implantation
• D. Formation of the corpus albicans

Explanation: Correct Answer: Formation of the corpus albicans.The corpus albicans is a scar-like structure that forms when the corpus luteum…

• A. Auxin
• B. Gibberellins
• C. Cytokinins
• D. All of the above

Explanation: Auxins are plant hormones that are involved in cell elongation, apical dominance, and the control of phototropism and gravitropism.

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

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

• A. Spermatozoa
• B. Primary oocyte
• C. Secondary spermatocyte
• D. Spermatogonia

Explanation: The correct answer is Spermatozoa. Spermatids undergo a transformation process known as spermiogenesis to become spermatozoa, which are…

• A. Malnourishment
• B. Emotional stress
• C. Both A and B
• D. None of these

Explanation: Both malnourishment and emotional stress can adversely affect the female reproductive cycle.

• A. Megalis
• B. Zona pellucida
• C. Acrosome
• D. Both A and B

Explanation: The organelle that plays a crucial role in helping the sperm penetrate the ovum (egg) during fertilization is the acrosome.

• A. Uterus
• B. Ovary
• C. Cervix
• D. Oviduct

Explanation: The uterine tube, also known as the fallopian tube, opens into the uterus.

• A. Sperm duct
• B. Sacrotum
• C. Urethera
• D. Gamete

Explanation: The sperm duct, also known as the vas deferens, is the tube that transports sperm from the testes to the penis.

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

Explanation: Menopause is the time that marks the end of the menstrual cycles of a woman.

• A. Ureter
• B. Testes
• C. Urethra
• D. Abdominal cavity

Explanation: The sperm duct, also known as the vas deferens, carries sperm from the testes to the urethra.

• A. Lipids
• B. Hormones
• C. Digestive enzymes
• D. All of these

Explanation: The acrosome is a structure located at the tip of the sperm cell's head, and it contains hydrolytic enzymes.

• A. Voice deepens
• B. Pubic hair grow
• C. Hips broaden
• D. Menstrual cycle starts

Explanation: In females, puberty is associated with the development of secondary sexual characteristics, including breast development, widening of the…

• A. Foetal tissues
• B. Bone tissues
• C. Lymph tissues
• D. Cardiac muscle tissue

Explanation: The placenta is a temporary organ that forms during pregnancy and serves as the interface between the maternal and fetal tissues.

• A. Spermatogonia
• B. Oogonia
• C. Zygospores
• D. Eggs

Explanation: Germ cells in the ovary, specifically oogonia, undergo a process called oogenesis to produce eggs or ova.