Which of the following statement is correct about location of the male frog copulatory pad?

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Question

Which of the following statement is correct about location of the male frog copulatory pad?

Accepted Answer

Correct Answer: A — First digit of the fore limbStep-by-step Solution:In male frogs, the copulatory pad (also called the nuptial pad or thumb pad) is a thickened, rough, darkened area located on the first digit (pollex/thumb) of the forelimbs. It develops under the influence of male sex hormones (androgens) at the onset of the breeding season and regresses afterward. The rough texture is due to the presence of keratinized spines or papillae, which help the male maintain a firm grip on the female during amplexus — the mating embrace where the male clasps the female from behind.Why other options are wrong: (B) The pad is restricted to only the first digit (thumb), not the first and second; (C) The hind limbs are not involved — it is specifically the forelimbs; (D) The second digit of the forelimb does not bear the copulatory pad.Extended Explanation:Amplexus in frogs is the mating behaviour where the male mounts the female and wraps his forelimbs around her body (axillary amplexus — around the chest region — or inguinal amplexus — around the waist, depending on the species). The male fertilizes the eggs externally as the female releases them into water. The nuptial pad is an important example of sexual dimorphism — a physical difference between males and females of the same species. Other examples of sexual dimorphism in frogs: males often have vocal sacs (for calling); females are generally larger than males in most frog species. The presence or absence of a nuptial pad is used as a diagnostic feature for sexing frogs in the laboratory and field. The copulatory pad is absent in female frogs and in juveniles of both sexes.Key Concepts: Frog morphology, sexual dimorphism, nuptial/copulatory pad, amplexus, forelimb first digit, breeding adaptations.

Which of the following statement is correct about location of the male frog copulatory pad?

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Which of the following statement is correct about location of the male frog copulatory pad?

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