Home Subjects NEET Zoology

NEET Zoology

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

273 Q 6 Topics Take Test
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Difficulty: All Easy Medium Hard 111–120 of 273
Topics in NEET Zoology
Q.111 Medium Reproductive Health
Which of the following is NOT a recognized complication of untreated gonorrhea in females?
A Pelvic inflammatory disease
B Tubal infertility
C Meningitis
D Bartholin's cyst
Correct Answer:  C. Meningitis
EXPLANATION

While gonorrhea can cause PID, tubal infertility, and Bartholin's abscess/cyst, meningitis is not a typical complication. Meningitis is more associated with meningococcal infection.

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Q.112 Medium Reproductive Health
What is the primary mechanism of action of levonorgestrel emergency contraception?
A Prevents implantation of fertilized ovum
B Inhibits or delays ovulation
C Causes endometrial atrophy
D Increases uterine motility
Correct Answer:  B. Inhibits or delays ovulation
EXPLANATION

Levonorgestrel emergency contraception works primarily by inhibiting or delaying ovulation, especially when taken within 72 hours of unprotected intercourse.

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Q.113 Medium Reproductive Health
Which oral contraceptive formulation has the lowest risk of thromboembolic events?
A Second-generation pills with levonorgestrel
B Third-generation pills with desogestrel
C Pills containing drospirenone
D Progestin-only pills
Correct Answer:  D. Progestin-only pills
EXPLANATION

Progestin-only pills (minipills) have minimal thromboembolic risk as they lack estrogen. Combined oral contraceptives carry increasing risk: second-generation < third-generation < drospirenone-containing pills.

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Q.114 Medium Reproductive Health
At what level of hCG concentration in serum is an ectopic pregnancy typically detected via ultrasound?
A 500-1000 mIU/mL
B 1000-2000 mIU/mL
C 2000-5000 mIU/mL
D >10000 mIU/mL
Correct Answer:  B. 1000-2000 mIU/mL
EXPLANATION

Ectopic pregnancy is typically visible on transvaginal ultrasound when serum hCG levels reach 1000-2000 mIU/mL (discriminatory zone), though this varies.

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Q.115 Medium Reproductive Health
Which of the following statements about lactation is correct?
A Oxytocin stimulates milk production
B Prolactin triggers milk ejection reflex
C Lactation is suppressed by frequent suckling
D Prolactin maintains milk secretion
Correct Answer:  D. Prolactin maintains milk secretion
EXPLANATION

Prolactin maintains and sustains milk secretion, while oxytocin causes milk ejection reflex. Frequent suckling increases prolactin levels and maintains lactation.

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Q.116 Medium Reproductive Health
A woman exhibits symptoms of amenorrhea, hirsutism, and obesity. What could be the most likely endocrine disorder affecting her reproductive health?
A Hypothyroidism
B Hyperprolactinemia
C Polycystic ovary syndrome (PCOS)
D Cushing's syndrome
Correct Answer:  C. Polycystic ovary syndrome (PCOS)
EXPLANATION

PCOS presents with the triad of amenorrhea/oligomenorrhea, hirsutism (due to androgen excess), and obesity. It's the most common endocrine disorder affecting reproductive-age women in India.

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Q.117 Medium Reproductive Health
Which of the following contraceptive methods has the highest failure rate among barrier methods?
A Male condom
B Female condom
C Diaphragm
D Cervical cap
Correct Answer:  C. Diaphragm
EXPLANATION

Diaphragm has a failure rate of 12% with typical use, higher than male condoms (18%) and female condoms (21%) when considering perfect vs typical use. However, among barrier methods, diaphragm shows higher typical-use failure rates.

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Q.118 Medium Reproductive Health
During which phase of the menstrual cycle are FSH levels highest?
A Luteal phase
B Menstruation
C Follicular phase
D Post-ovulation
Correct Answer:  C. Follicular phase
EXPLANATION

FSH levels peak during the follicular phase, stimulating follicle development and estrogen production. Levels decline after ovulation.

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Q.119 Medium Reproductive Health
What is the significance of hCG (human Chorionic Gonadotropin) in pregnancy?
A It maintains the corpus luteum to produce progesterone
B It stimulates ovulation
C It causes menstruation
D It develops secondary sexual characters
Correct Answer:  A. It maintains the corpus luteum to produce progesterone
EXPLANATION

hCG, produced by the trophoblast after implantation, maintains the corpus luteum, ensuring continued progesterone production essential for pregnancy maintenance.

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Q.120 Medium Reproductive Health
Which of the following is a natural method of family planning?
A Tubal ligation
B Ovulation method (Billings method)
C IUD insertion
D Hormonal implants
Correct Answer:  B. Ovulation method (Billings method)
EXPLANATION

The Billings ovulation method is a natural family planning technique based on observing changes in cervical mucus to identify fertile days.

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