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 765 of 993
- A. Fallopian tube
- B. Urethra
- C. Vagina
- D. All of the choices are correct
Explanation: The uterus opens into the vagina through the cervix. The cervix is the lower part of the uterus that connects to the vagina, serving as a…
Correct answer: Vagina15282. In mammals that are seasonal breeders, females are receptive only once a year. This is called:
- A. A follicular cycle
- B. An estrous cycle
- C. A menstrual cycle
- D. A luteal cycle
Explanation: An estrous cycle is the reproductive cycle in mammals, during which the female is sexually receptive and displays behaviors to attract…
Correct answer: An estrous cycle- A. Myometrium
- B. Perimetrium
- C. Endometrium
- D. Both (A) and (C)
Explanation: The uterine wall is composed of three layers which are endometrium, myometrium, and perimetrium.
Correct answer: Endometrium- A. Progesterone
- B. Follicle stimulating hormone
- C. Luteinizing hormone
- D. Chorionic gonadotrophic hormone
Explanation: The follicle cells, after release of the egg. are modified to form a special structure called corpus luteum.
Correct answer: Progesterone- A. Corpus luteum
- B. Graffian follicle
- C. Primary follicle
- D. Germinal epithelium
Explanation: Graffian follicle is the mature follicle that releases the secondary oocyte during ovulation.
Correct answer: Graffian follicle- A. Morula, parturition
- B. Blastocyst, parturiton
- C. Blastocyst, implantation
- D. Morula, implantation
Explanation: The blastocyst is the stage at which the embryo implants into the endometrial lining of the uterus.
Correct answer: Blastocyst, implantation- A. Oxytocin
- B. Follicle stimulating hormone
- C. Luteinizing hormone
- D. None of these
Explanation: The release of milk from mammary glands is primarily controlled by oxytocin.
Correct answer: Oxytocin15288. An egg fertilized in the laboratory and then implanted in the uterus for development is called:
- A. Cloning
- B. Test tube baby
- C. Both (A) and (B)
- D. In vivo fertilization
Explanation: Test tube babies term refers to a baby conceived through in vitro fertilization (IVF), where an egg is fertilized by sperm outside the…
Correct answer: Test tube baby- A. Implantation period
- B. Gestation period
- C. Extra uterine period
- D. Imprinting period
Explanation: Gestation period also known as pregnancy, this is the time from conception (fertilization of the egg by sperm) until birth.
Correct answer: Gestation period- A. 30 to 40 years
- B. 45 to 50 years
- C. 60 to 65 years
- D. 70 years
Explanation: In human beings, menstrual cycle cease around 50 year of age and it is termed menopause.
Correct answer: 45 to 50 years- A. Gonadotropin
- B. Oxytocin
- C. Luteinizing hormone
- D. Progesterone
Explanation: The term gonadotropin refers to hormones that stimulate the gonads (testes and ovaries).
Correct answer: Gonadotropin- A. Syphilis
- B. Genital herpes
- C. Gonorrhea
- D. AIDS
Explanation: Syphilis is caused by the bacterium Treponema pallidum. It's a sexually transmitted infection (STI) that can have serious complications if…
Correct answer: Syphilis- A. A bacterium
- B. A sporozoan
- C. A virus
- D. A fungus
Explanation: Genital herpes is a type of STD caused by a virus, specifically the herpes simplex virus (HSV).
Correct answer: A virus- A. Menstruation
- B. Pregnancy
- C. Implantation
- D. All (A), (B) and (C)
Explanation: Menstruation occurs when the lining of the uterus sheds in the absence of pregnancy.
Correct answer: Menstruation- A. Amnion
- B. Chorionic villum
- C. Umbilical cord
- D. Allantois
Explanation: The umbilical cord is a flexible tube-like structure that connects the fetus to the placenta.
Correct answer: Umbilical cord15296. Gonorrhea is:
- A. Bacterial disease
- B. Viral disease
- C. Protozoanal disease
- D. Fungal disease
Explanation: Gonorrhea is a bacterial disease caused by the bacterium Neisseria gonorrhoeae.
Correct answer: Bacterial disease- A. In vitro fertilization
- B. In vivo fertilization
- C. Both (A) and (B)
- D. None of these
Explanation: The technique of In vitro fertilization involves fertilizing an egg with sperm outside the body, typically in a laboratory dish.
Correct answer: In vitro fertilization- A. Graffian follicle
- B. Corpus luteum
- C. Placenta
- D. All choices are incorrect
Explanation: The placenta is the correct answer. It is an organ that develops in the uterus during pregnancy and serves as a connection between the…
Correct answer: Placenta- A. Prolactin
- B. GnRH
- C. FSH
- D. Oxytocin
Explanation: Oxytocin is the hormone primarily responsible for stimulating contractions of the uterine muscles during labor (parturition).
Correct answer: Oxytocin- A. 20,000
- B. 250,000
- C. 300,000
- D. 450
Explanation: Each female ovary potentially contains 200,000 follicles. Formed before her birth, of these, only several hundred will release egg cells…
Correct answer: 450