All the statement are correct about the external morphology of frog but one is wrong. Which one is wrong?

Options

A. Body is divisible into head and trunk. A neck and tail are absent
B. In the hind limbs five digits are present. They are webbed and help in swimming
C. Male frogs have sound producing vocal sacs and a copulatory pad on the first digit of the forelimbs
D. The forelimbs have four webbed digits.

Explanation

To determine which statement about the external morphology of frogs is incorrect, let's analyze each statement step by step:

1. **Statement 1**: "Body is divisible into head and trunk; a neck and tail are absent."
- Frogs have a body that is indeed divided into a head and a trunk. Adult frogs do not have a neck or a tail, which is true.
- **Conclusion**: This statement is correct.

2. **Statement 2**: "In the hind limbs, five digits are present; they are webbed and help in swimming."
- Frogs have large hind limbs that typically have five digits. These digits are webbed, which aids in swimming.
- **Conclusion**: This statement is correct.

3. **Statement 3**: "Male frogs have sound-producing vocal sacs and copulatory pads on the first digit of the forelimb."
- Male frogs do have vocal sacs that allow them to produce croaking sounds, which are used to attract females. They also have copulatory pads (or nuptial pads) on their forelimbs that help them hold onto females during mating.
- **Conclusion**: This statement is correct.

4. **Statement 4**: "The forelimbs have four webbed digits."
- Frogs have four digits on their forelimbs, but these digits are not webbed. The webbing is primarily found on the hind limbs.
- **Conclusion**: This statement is incorrect.

### Final Answer:
The incorrect statement about the external morphology of frogs is: "The forelimbs have four webbed digits."

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