Match the following about reptiles
`{:("Structure absent","Group"),("A) Copulatory organ","1) Ophidia"),("B) urinary bladder","2) Chelonia"),("C) Tympanum","3) Crocodilia"),("D) Temporal fossac","4) Rhychocephalia"):}`

Options

A. A-4, B-3, C-1, D-2
B. A-1, B-4, C-2, D-3
C. A-3, B-1, C-2, D-4
D. A-2, B-3, C-4, D-1

Answer

To solve the matching question about reptiles, we need to identify which structures are absent in each group of reptiles listed. Let's go through each option step by step.

### Step-by-Step Solution:

1. **Copulatory Organ**:
- The question states that the structure is absent. In reptiles, copulatory organs are typically absent in the group **Rhychocephalia** (which includes the tuatara).
- **Match**: A) Copulatory organ → 4) Rhychocephalia

2. **Urinary Bladder**:
- The urinary bladder is absent in **Crocodilia**. Crocodiles excrete semi-solid waste, which is primarily uric acid, and they do not have a urinary bladder.
- **Match**: B) Urinary bladder → 3) Crocodilia

3. **Tympanum**:
- The tympanum, which is an external hearing structure, is absent in **Ophidia** (snakes). Snakes detect sound through ground vibrations rather than through tympanic membranes.
- **Match**: C) Tympanum → 1) Ophidia

4. **Temporal Fossa**:
- The temporal fossa is a depression in the skull that is absent in **Chelonia** (turtles). Turtles have a different skull structure that does not include this feature.
- **Match**: D) Temporal fossa → 2) Chelonia

### Final Matches:
- A) Copulatory organ → 4) Rhychocephalia
- B) Urinary bladder → 3) Crocodilia
- C) Tympanum → 1) Ophidia
- D) Temporal fossa → 2) Chelonia

### Summary of Matches:
- A → 4
- B → 3
- C → 1
- D → 2