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Which of the following statement is correct about location of the male frog copulatory pad?
Male frogs have VOCAL SACS (throat) and a COPULATORY PAD on the 1st DIGIT of FORE LIMB! Absent in females!
Male and female frogs can be distinguished externally during the breeding season by specific dimorphic structures:
During copulatory clasping (amplexus), fertilisation is external in water. The copulatory pad on the 1st digit of the forelimb provides tactile friction and a firm grip on the smooth, mucus-coated body of the female frog.
The pad is located strictly on the first digit of the forelimb (not on the second digit, and never on the hindlimbs). Thus, Option (4) is 100% correct.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect. The copulatory pad is restricted exclusively to the first digit of the forelimb, not the second.
Incorrect. Forelimbs are used for clasping the female; hindlimbs are adapted for swimming and leaping and have no copulatory pad.
Incorrect. It is present on the first digit, not the second digit.
100% correct. NCERT explicitly states copulatory pad is on the first digit of the fore limbs in male frogs.
Examiners frequently swap forelimb with hindlimb, or claim it occurs on the 2nd/3rd digit. Remember: clasping requires the arms (forelimbs) and the "thumb" (1st digit)!
"Male frogs possess vocal sacs and a copulatory pad on the first digit of the forelimbs."
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