The copulatory pad of male frog is present on 

Options

A. `2^(nd)` digit of hind limb
B. `1^(st)` digit of hind limb
C. first digit of fore limb
D. absent

Answer

To answer the question "The copulatory pad of male frog is present on," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Copulatory Pad**: The copulatory pad is a specialized structure found in male frogs that aids in mating.

2. **Analyzing the Options**: The options provided are:
- a) Second digit of hind limbs
- b) First digit of hind limbs
- c) First digit of forelimb
- d) Absent

3. **Eliminating Incorrect Options**:
- **Option d (Absent)**: This option can be eliminated because we know that male frogs do possess a copulatory pad.
- **Options a and b (Hind Limbs)**: The hind limbs of frogs are primarily adapted for jumping and are muscular in structure. They do not play a role in copulation, so both options a and b can be eliminated.

4. **Identifying the Correct Option**:
- **Option c (First digit of forelimb)**: The copulatory pad is actually located on the first digit of the forelimb in male frogs. This structure is important for grasping the female during mating.

5. **Conclusion**: Therefore, the correct answer is that the copulatory pad of the male frog is present on the **first digit of the forelimb**.

### Final Answer:
The copulatory pad of male frog is present on the **first digit of forelimb**.

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