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NEET Zoology

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

114 Q 6 Topics Take Test
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Difficulty: All Easy Medium Hard 31–40 of 114
Topics in NEET Zoology
A couple has been trying to conceive for 2 years without success. The male partner has normal semen parameters, but the female partner has elevated FSH levels. What does this indicate?
A Polycystic ovary syndrome
B Diminished ovarian reserve
C Hyperprolactinemia
D Thyroid dysfunction
Correct Answer:  B. Diminished ovarian reserve
EXPLANATION

Elevated basal FSH (>10 IU/L on day 3) indicates reduced ovarian reserve, meaning fewer eggs remain in the ovaries, affecting fertility prognosis.

Test
A 35-year-old woman with three previous cesarean deliveries presents with vaginal bleeding at 32 weeks. What is the most likely diagnosis?
A Placental abruption
B Placenta previa
C Placenta accreta
D Morbidly adherent placenta
Correct Answer:  C. Placenta accreta
EXPLANATION

Multiple cesarean deliveries increase the risk of abnormal placentation, including placenta accreta, where placental villi invade the myometrium, leading to hemorrhage.

Test
During oogenesis, at which stage does the first meiotic division complete?
A Before puberty in fetal ovaries
B At ovulation
C After fertilization when sperm penetrates egg
D During fetal development but arrested at metaphase II
Correct Answer:  B. At ovulation
EXPLANATION

Oocytes arrest in prophase I during fetal development and remain in this arrested state (dictyotene). First meiotic division completes just before ovulation, producing secondary oocyte and polar body.

Test
A 26-year-old male presents with complaints of erectile dysfunction and reduced sperm count. Testosterone level is 2.5 ng/mL (normal: 3-10 ng/mL). What could be the underlying cause?
A Primary hypogonadism
B Secondary hypogonadism from pituitary dysfunction
C Androgen insensitivity syndrome
D Klinefelter syndrome with normal testosterone
Correct Answer:  B. Secondary hypogonadism from pituitary dysfunction
EXPLANATION

Low testosterone with erectile dysfunction requires assessment of LH and FSH. If LH/FSH are low, it indicates secondary hypogonadism (pituitary/hypothalamic origin).

Test
During in vitro fertilization (IVF), what is the purpose of using GnRH agonists in the downregulation phase?
A To increase FSH levels for superovulation
B To suppress endogenous GnRH, preventing premature LH surge
C To directly stimulate ovarian follicles
D To increase progesterone production
Correct Answer:  B. To suppress endogenous GnRH, preventing premature LH surge
EXPLANATION

GnRH agonists cause initial stimulation followed by desensitization, suppressing endogenous LH and FSH to prevent premature ovulation during controlled ovarian hyperstimulation.

Test
A couple has been trying to conceive for 2 years without success. The male partner has normal semen analysis. What is the next appropriate investigation for the female partner?
A Hysterosalpingography (HSG)
B Laparoscopy
C Hormone level assessment (Day 3 FSH, LH)
D Pelvic ultrasound for ovarian assessment
Correct Answer:  A. Hysterosalpingography (HSG)
EXPLANATION

HSG is the first-line radiological investigation for assessing tubal patency and uterine cavity in suspected secondary infertility after normal male factor evaluation.

Test
A 28-year-old female reports irregular menstrual cycles with excessive bleeding. Laboratory tests show elevated FSH and normal prolactin levels. What could be the likely diagnosis?
A Hyperprolactinemia
B Premature Ovarian Insufficiency (POI)
C Thyroid dysfunction
D Polycystic Ovary Syndrome
Correct Answer:  B. Premature Ovarian Insufficiency (POI)
EXPLANATION

Elevated FSH with irregular cycles indicates diminished ovarian reserve characteristic of POI. PCOS typically shows normal or low FSH with hyperandrogenism.

Test
A woman on long-term anticonvulsant therapy wishes to use oral contraceptives. What should be the recommended action?
A Standard combined oral contraceptive is suitable
B Higher dose estrogen pill or alternative method advised
C Progestin-only pill is contraindicated
D No special consideration needed
Correct Answer:  B. Higher dose estrogen pill or alternative method advised
EXPLANATION

Anticonvulsants like phenytoin induce hepatic metabolism of contraceptive hormones, reducing efficacy. Higher-dose estrogen pills or alternative methods are recommended.

Test
What is the 'window of implantation' in the endometrium?
A Days 1-5 after ovulation
B Days 6-10 after ovulation
C Days 11-15 after ovulation
D Days 16-20 after ovulation
Correct Answer:  B. Days 6-10 after ovulation
EXPLANATION

The window of implantation occurs 6-10 days after ovulation (days 20-24 of a 28-day cycle) when the endometrium is optimally receptive for blastocyst implantation.

Test
What is the most common sexually transmitted infection (STI) affecting reproductive health in India as per 2024 data?
A Syphilis
B Chlamydia trachomatis
C Gonorrhea
D HPV
Correct Answer:  D. HPV
EXPLANATION

HPV (Human Papillomavirus) is the most prevalent STI globally and in India, with significant links to cervical cancer and reproductive complications.

Test
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