Home Subjects NEET Zoology Reproductive Health

NEET Zoology
Reproductive Health

Zoology questions for NEET UG — Animal Kingdom, Human Physiology, Genetics, Evolution.

52 Q 6 Topics Take Mock Test
Advertisement
Difficulty: All Easy Medium Hard 21–30 of 52
Topics in NEET Zoology
A couple seeks fertility treatment after 3 years of unprotected intercourse without conception. Which investigation should be done first in the female partner?
A Laparoscopy
B Hysterosalpingography
C Ovulation assessment and basic hormonal profile
D Endometrial biopsy
Correct Answer:  C. Ovulation assessment and basic hormonal profile
EXPLANATION

Initial infertility workup in females includes confirmation of ovulation (through basal body temperature, progesterone levels) and basic hormone assessment before invasive procedures.

Test
What is the mechanism of action of misoprostol when used for medical abortion in the first trimester?
A Inhibits progesterone receptor, detaches endometrium
B Causes uterine contractions to expel pregnancy tissue
C Induces apoptosis of trophoblastic cells
D Blocks blood supply to developing embryo
Correct Answer:  B. Causes uterine contractions to expel pregnancy tissue
EXPLANATION

Misoprostol, a prostaglandin analog, causes sustained uterine contractions that expel pregnancy tissues. It is typically used after mifepristone (progesterone antagonist) in medical abortion protocols.

Test
Which sexually transmitted infection is characterized by painless genital ulcers with indurated edges and a clean base?
A Gonorrhea
B Primary syphilis
C Herpes simplex virus
D Lymphogranuloma venereum
Correct Answer:  B. Primary syphilis
EXPLANATION

Primary syphilis presents with painless, indurated ulcers (chancre) with a clean base and raised borders. HSV causes painful vesicles; LGV causes small painless pustules.

Test
A woman using combined oral contraceptive pills reports breakthrough bleeding. Which factor is MOST likely responsible?
A Excessive estrogen dose
B Insufficient progestin for endometrial stability
C Increased endometrial proliferation from high estrogen
D Overdose of progestin causing endometrial atrophy
Correct Answer:  B. Insufficient progestin for endometrial stability
EXPLANATION

Breakthrough bleeding typically results from insufficient progestin to stabilize endometrium. Management includes switching to a pill with higher progestin content.

Test
What is the most common chromosomal abnormality in spontaneous miscarriages?
A Trisomy 13
B Trisomy 21
C Trisomy 16
D Monosomy X
Correct Answer:  C. Trisomy 16
EXPLANATION

Trisomy 16 is the most common chromosomal abnormality in first-trimester miscarriages (accounts for ~15% of chromosomal losses) but is incompatible with life beyond early pregnancy.

Test
Which of the following is a characteristic feature of Polycystic Ovary Syndrome (PCOS)?
A High LH to FSH ratio (>2:1 or 3:1)
B Low androgen levels
C Regular ovulatory cycles
D Elevated TSH levels
Correct Answer:  A. High LH to FSH ratio (>2:1 or 3:1)
EXPLANATION

PCOS typically presents with elevated LH:FSH ratio (>2:1 or 3:1), hyperandrogenism, insulin resistance, and anovulation, not regular cycles.

Test
A 32-year-old woman presents with amenorrhea and galactorrhea. Pregnancy test is negative. Which investigation would be MOST diagnostic?
A Serum prolactin levels
B FSH and LH levels
C Thyroid function tests
D Estrogen level estimation
Correct Answer:  A. Serum prolactin levels
EXPLANATION

Galactorrhea with amenorrhea strongly suggests hyperprolactinemia. Serum prolactin >200 ng/mL indicates pituitary adenoma, while TSH should also be checked for secondary hyperprolactinemia.

Test
What is the primary advantage of Copper-T (Cu-IUD) over hormonal IUDs in terms of side effects?
A No hormonal side effects and longer duration of action
B Heavier menstrual bleeding compared to hormonal IUDs
C Higher expulsion rates
D Requires replacement every 2 years
Correct Answer:  A. No hormonal side effects and longer duration of action
EXPLANATION

Cu-IUDs work non-hormonally, avoiding systemic hormonal side effects. They are effective for 10 years, longer than some hormonal variants.

Test
Which of the following STIs can be VERTICAL transmitted (from mother to child)?
A Chlamydia trachomatis only
B Syphilis and HIV
C Gonorrhea and Chlamydia only
D All STIs can be vertically transmitted
Correct Answer:  B. Syphilis and HIV
EXPLANATION

Syphilis (causes congenital syphilis), HIV, Hepatitis B, and HSV can be vertically transmitted. Chlamydia and gonorrhea cause neonatal infections but are acquired during delivery.

Test
Which stage of spermatogenesis is most sensitive to radiation damage?
A Spermatogonial stage
B Primary spermatocyte stage
C Secondary spermatocyte stage
D Spermatid stage
Correct Answer:  A. Spermatogonial stage
EXPLANATION

Spermatogonial stem cells are most radiosensitive. Damage here affects all subsequent stages. Recovery takes 74 days (duration of spermatogenesis).

Test
IGET
IGET AI
Online · Exam prep assistant
Hi! 👋 I'm your iget AI assistant.

Ask me anything about exam prep, MCQ solutions, study tips, or strategies! 🎯
UPSC strategy SSC CGL syllabus Improve aptitude NEET Biology tips