Which of the following pairs is wrong?

Options

A. Uricotelic ...... Birds
B. Ureotelic …… Insect
C. Ammonotelic …… Tadpole
D. Ureotelic …… Elephant

Explanation

To determine which pair is wrong among the given options, we need to understand the terms related to nitrogenous waste excretion in different organisms:

1. **Eurycotallic**: This term seems to be a misspelling or confusion with "Uricotallic," which refers to organisms that excrete nitrogenous waste primarily in the form of uric acid.

2. **Euryotallic**: This term appears to be a misspelling or confusion with "Ureotallic," which refers to organisms that excrete nitrogenous waste primarily in the form of urea.

3. **Ammonotallic**: This refers to organisms that excrete nitrogenous waste primarily in the form of ammonia.

Now, let's analyze each pair:

1. **Eurycotallic birds**: Birds are known to excrete nitrogenous waste as uric acid, making this pair correct if we interpret "Eurycotallic" as a reference to uric acid excretion.

2. **Euryotallic insects**: Insects primarily excrete nitrogenous waste as uric acid, not urea. Therefore, this pair is incorrect.

3. **Ammonotallic tadpole**: Tadpoles, being aquatic, excrete ammonia as their nitrogenous waste. This pair is correct.

4. **Euryotallic elephant**: Elephants, being mammals, excrete urea, which means this pair is also correct if we interpret "Euryotallic" as a reference to urea excretion.

Based on this analysis, the wrong pair is:

**Euryotallic insects** (as insects are uricotallic, not ureotallic).

### Step-by-Step Solution:
1. **Understand the terms**: Identify what Eurycotallic, Euryotallic, Ammonotallic, Uricotallic, and Ureotallic mean in terms of nitrogenous waste.
2. **Analyze each pair**: Check if the organisms in each pair excrete the nitrogenous waste as stated.
3. **Identify the incorrect pair**: Determine which pair does not match the correct classification of nitrogenous waste excretion.

### Final Answer:
The wrong pair is **Euryotallic insects**.