Frog Sexual Dimorphism — Vocal Sacs and Copulatory Pad on 1st Digit
✅ Asked in NEET 2026Male frogs can be distinguished from female frogs due to the presence of: A. Bulging eyes; B. Vocal sacs; C. Webbed digits in feet; D. Copulatory pad on first digit of fore limbs; E. Olive green-coloured skin with dark irregular spots.
Male frogs can be distinguished from female frogs due to the presence of: A. Bulging eyes; B. Vocal sacs; C. Webbed digits in feet; D. Copulatory pad on first digit of fore limbs; E. Olive green-coloured skin with dark irregular spots.
Which of the following statement is correct about location of the male frog copulatory pad?
Answer & NCERT explanation
Correct answer: D — B and D only
Males have vocal sacs (for croaking) and a copulatory pad on the first digit of the forelimb. Bulging eyes, webbed digits and dark-spotted olive-green skin are common to both sexes.
Read more NCERT concept on the PYQ
The hind limbs end in five digits and they are larger and muscular than fore limbs that end in four digits. Feet have webbed digits that help in swimming. Frogs exhibit sexual dimorphism. Male frogs can be distinguished by the presence of sound producing vocal sacs and also a copulatory pad on the first digit of the fore limbs which are absent in female frogs.
Frogs exhibit sexual dimorphism — males can be distinguished from females by two unique structures absent in females. Male frogs have: (1) Sound-producing vocal sacs (paired), which produce the characteristic croaking sound, and (2) A copulatory pad on the first digit (thumb) of the fore limbs, which helps grip the female during amplexus (mating embrace). Structures common to BOTH sexes: bulging eyes, webbed digits in feet, and olive-green coloured skin with dark irregular spots. Fore limbs end in 4 digits; hind limbs end in 5 digits.
NEET 2026 and 2025 both tested this same content. NEET 2026 asked which features distinguish males (answer: vocal sacs + copulatory pad = option D with B and D). NEET 2025 asked specifically where the copulatory pad is located (first digit of the fore limb — answer D). The traps in NEET 2026: bulging eyes (common to both), webbed digits (common to both), olive-green skin (common to both) — none of these are male-exclusive. Only vocal sacs and copulatory pad are male-specific.
Bulging eyes and webbed feet distinguish male frogs from female frogs.
Bulging eyes and webbed digits are COMMON to both sexes. Only VOCAL SACS and COPULATORY PAD (1st digit fore limb) are male-exclusive.
MALE = Vocal (sound) + Pad (grip). Eyes + Webs = BOTH. Pad is on THUMB (1st digit) of FORE limb — not hind limb.
- Copulatory pad: on first digit (thumb) of the fore limbs — helps male grip female during amplexus.
- Vocal sacs: present only in male frogs — produce croaking sound for mate attraction.
- Fore limbs: 4 digits. Hind limbs: 5 digits with webbing for swimming.
- Bulging eyes, webbed feet, olive-green skin with dark spots = common to BOTH sexes.
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