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Most Repeated MDCAT Biology: Reproduction MCQs
The most repeated Reproduction questions in MDCAT Biology, measured from 377 real past papers. Reproduction contributed 634 questions across those papers, and 9 distinct questions recurred with the same verified answer across 2 or more different exam years — listed below (ranked by how many years each recurs in), with the answer, an explanation, and the exact years.
Measured from 377 real past papers · updated July 2026
- 1Repeated in 2 yearsReproduction
The end or complete stop of the menstrual cycle is called:
- AMenopause✓
- BEmotional stress
- CMalnourishment effect of cycle
- DMensuration
Explanation
This is the correct answer. Menopause is the natural biological process that marks the end of a woman's menstrual cycles. It typically occurs in women in their late 40s or early 50s and is characterized by the cessation of menstrual periods for at least 12 consecutive months.
Appeared in the past papers of: 2016, 2021
- 2Repeated in 2 yearsReproduction
Syphilis is a sexually transmitted disease which is caused by:
- AHIV / AIDS
- BPseudomonas Pyogenes
- CTreponema Pallidum✓
- DNeisseria
Explanation
The bacteria responsible for causing syphilis is treponema pallidum.
Appeared in the past papers of: 2011, 2012
- 3Repeated in 2 yearsReproduction
Treponema pallidum causes:
- AAIDS
- BGenital herpes
- CSyphilis✓
- DGonorrhea
Explanation
Treponema pallidum is the bacterium responsible for causing syphilis, a sexually transmitted infection.
Appeared in the past papers of: 2013, 2016
- 4Repeated in 2 yearsReproduction
Sperms of which animal can remain viable for years within the female genital tract?
- AWhale
- BBat✓
- CCamel
- DGiraffe
Explanation
In most mammals, sperm is capable of fertilizing eggs for only a few days after copulation. Female bats have the ability to store sperm for extended periods, ranging from several months to even years, making them the correct answer in this context. Whales, camels, and giraffes do not exhibit the same level of sperm viability within the female genital tract as bats do.
Appeared in the past papers of: 2009, 2010
- 5Repeated in 2 yearsReproduction
The organism developed with two heads and one trunk is called:
- AIdentical twins
- BDizygotic twins
- CFraternal twins
- DSiamese twins✓
Explanation
Siamese twins or also known as Conjoined twins. It is a very rare condition in which twins are joined side to side at the pelvis and part or all of the belly (abdomen) and chest but with separate heads. Such twins develop when an early embryo only partially separates to form two individuals.
Appeared in the past papers of: 2011, 2018
- 6Repeated in 2 yearsReproduction
Embryo implants in the _ of the uterus:
- APerimetrium
- BMyometrium
- CEndometrium✓
- DCervix
Explanation
The embryo implants in the endometrium of the uterus. The endometrium is the innermost layer of the uterine wall, and it undergoes cyclic changes during the menstrual cycle in preparation for potential embryo implantation. Therefore, option c is correct.
Appeared in the past papers of: 2016, 2022
- 7Repeated in 2 yearsReproduction
The corpus luteum is formed at the site of.....
- AMenstruation
- BImplantation
- CFertilization
- DOvulation✓
Explanation
Corpus luteum, yellow hormone-secreting body in the female reproductive system. It is formed in an ovary at the site of a follicle, or sac, that has matured and released its ovum, or egg, in the process known as ovulation.
Appeared in the past papers of: 2017, 2023
- 8Repeated in 2 yearsReproduction
In human males, inhibin hormone is produced by:
- ALeyding Cells
- BSertoli Cells✓
- CGerminal Epithelium
- DInterstitial Cell
Explanation
Inhibin is a hormone produced by Sertoli cells in the testes of human males. It plays a crucial role in regulating the production of follicle-stimulating hormone (FSH) by the pituitary gland.
Appeared in the past papers of: 2023, 2024
- 9Repeated in 2 yearsReproduction
The usual duration of luteal phase in the menstrual cycle of human female is:
- A4-6 days
- B8-10 days
- C12-14 days✓
- D10-12 days
Explanation
The usual duration of luteal phase in the menstrual cycle for the human female is 12-14 days.The luteal phase lasts from the day after ovulation until the day before your period starts. Experts say the average length of the luteal phase is 14 days, but there is a little difference that varies from one person to another.
Appeared in the past papers of: 2013, 2016