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NEET Zoology

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

540 Q 6 Topics Take Test
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Difficulty: All Easy Medium Hard 211–220 of 540
Topics in NEET Zoology
Q.211 Medium Reproductive Health
Which sexually transmitted infection is characterized by 'strawberry cervix' appearance?
A Chlamydia trachomatis infection
B Trichomonas vaginalis infection
C Neisseria gonorrhoeae infection
D Candida albicans infection
Correct Answer:  B. Trichomonas vaginalis infection
EXPLANATION

Trichomonas vaginalis causes a distinctive 'strawberry cervix' appearance with petechial hemorrhages. It also causes frothy yellow-green vaginal discharge.

Test
At what age does the average Indian girl experience menarche?
A 9-10 years
B 11-13 years
C 14-16 years
D 17-19 years
Correct Answer:  B. 11-13 years
EXPLANATION

The average age of menarche in Indian girls is 11-13 years, though it can vary based on nutritional status, genetics, and geographic location.

Test
Q.213 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.

Test
Q.214 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.

Test
Q.215 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.

Test
Q.216 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.

Test
Q.217 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.

Test
Q.218 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.

Test
Which intrauterine device (IUD) releases copper ions to prevent fertilization?
A Levonorgestrel IUD
B Copper T 380A
C Mirena
D Skyla
Correct Answer:  B. Copper T 380A
EXPLANATION

Copper T 380A is a non-hormonal IUD that works by releasing copper ions which are spermicidal. Levonorgestrel IUD (Mirena, Skyla) are hormonal IUDs.

Test
What is the normal duration of the luteal phase of the menstrual cycle?
A 5-8 days
B 12-16 days
C 18-22 days
D 23-28 days
Correct Answer:  B. 12-16 days
EXPLANATION

The luteal phase typically lasts 12-16 days (average 14 days) and is characterized by relatively constant progesterone production from the corpus luteum.

Test
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