All Free Biology MCQs with Answers
Every Biology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
19,844 questions · page 782 of 993
- A. Graafian luteum
- B. Corpus luteum
- C. Ruptured ovum
- D. Follicle
- E. Progestrone
Explanation: After the release of an egg during ovulation, the follicle from which the egg was released undergoes a transformation and forms a…
Correct answer: Corpus luteum- A. 50-100 lobules
- B. 150-200 lobules
- C. 200-300 lobules
- D. 250-300 lobules
Explanation: Each human testis is divided into approximately 250-300 lobules. These lobules are small compartments or sections within the testis that…
Correct answer: 250-300 lobules- A. Pituitary Gland
- B. Hypothalamus
- C. Sertoli cells
- D. Leydig cells or interstitial cells
Explanation: Leydig cells, also known as interstitial cells, are responsible for the production and release of testosterone in males.
Correct answer: Leydig cells or interstitial cells- A. Menstrual stage
- B. Proliferative stage
- C. Ovulation stage
- D. Secretory stage
Explanation: The ovulation stage is when the mature egg is released from the ovary. Leutinizing hormone (LH) levels surge dramatically just before…
Correct answer: Ovulation stage- A. Blood transfusion
- B. Insect bite
- C. contaminated water
- D. Sexual contact
Explanation: The major source of transmission for syphilis is through sexual contact, specifically through direct contact with syphilis sores or mucous…
Correct answer: Sexual contact- A. Urethra
- B. Epididymis
- C. Oviduct
- D. Seminiferous tubules
Explanation: Testes are composed largely of seminiferous tubules-coiled tubes, the walls of which contain cells that produce sperm-and are surrounded…
Correct answer: Seminiferous tubules- A. Sperm cell
- B. Mesophyll cell
- C. Skin cell
- D. Muscular cell
Explanation: The word haploid (meaning 'half') describes a cell that contains a single set of chromosomes.
Correct answer: Sperm cell- A. Vasa efferentia
- B. Vas deferens
- C. Urethra
- D. Epididymis
Explanation: Sperm cells pass through a series of ducts to reach the outside of the body.
Correct answer: Urethra15629. After fertilization, the zygote takes _ for its journey from the fallopian tube toward uterus.
- A. 6-7 days
- B. 3-6 days
- C. 10-12 days
- D. 12-15 days
Explanation: After fertilization, the zygote does takes 6-7 days to reach the uterus. This option is the correct option.
Correct answer: 6-7 days- A. 37 °C
- B. 32°C
- C. 30°C
- D. 35°C
Explanation: It is a fact that 35°C is the best temperature for spermatogenesis. Option D is the correct option.
Correct answer: 35°C- A. Follicle development
- B. Ovulation
- C. Embryo implantation
- D. Menstruation
Explanation: As its name suggests, follicle-stimulating hormone stimulates and helps in the development of FOLLICLES. Hence, option A is correct.
Correct answer: Follicle development- A. Follicle development
- B. Ovulation
- C. Embryo implantation
- D. Menstruation
Explanation: As its name suggests, follicle-stimulating hormone stimulates and helps in the development of FOLLICLES. Hence, option A is correct.
Correct answer: Follicle development- A. Testosterone production
- B. FSH production
- C. Sperm production
- D. Testosterone inhibition
Explanation: Leydig cells function to stimulate the production of the hormone testosterone.
Correct answer: Testosterone production- A. Neurons
- B. Hormones
- C. Glands
- D. Hypothalamus
Explanation: Chemical messengers produced by glands in the endocrine system that travel through the bloodstream to target organs and tissues, where…
Correct answer: Hormones- A. Menstrual stage
- B. Follicular stage
- C. Proliferative stage
- D. Secretory stage
Explanation: Secretory stage begins after ovulation and lasts until the end of the menstrual cycle.
Correct answer: Secretory stage- A. 20-150 million
- B. 2-10 million
- C. 20-150 thousand
- D. 2-10 thousand
Explanation: Average sperm count per ml of semen is 20 -150 million.
Correct answer: 20-150 million- A. Testosterone
- B. Parathormone
- C. Oxytocin
- D. Progesterone
Explanation: Testosterones are secreted by gonads or leydig cells.Parathormone is secreted by four parathyroid glands.Oxytocin is secreted by the…
Correct answer: Progesterone- A. Acrosome
- B. Head
- C. Mid piece
- D. Tail
Explanation: Option C is Correct as Mid-piece of sperm has the mitochondrion. (NOTE: The child gets mitochondrion from mothers).
Correct answer: Mid piece- A. Follicle-Stimulating Hormone (FSH)
- B. Estrogen
- C. Progesterone
- D. Luteinizing Hormone (LH)
Explanation: Progesterone is produced by the corpus leuteum in the ovary after ovulation.
Correct answer: Progesterone- A. Testosterone
- B. GnRH
- C. FSH
- D. Inhibin
- E. Luteinizing hormone
Explanation: Inhibin is a hormone produced by the gonads (ovaries in females and testes in males) that inhibits the secretion of follicle-stimulating…
Correct answer: Inhibin