How many of the following animals are ureotelic ?
[Shark , Human , Rohu , Skate Tadpole , Frog , Cockroach]

Options

A. Two
B. Three
C. Four
D. Five

Answer

To determine how many of the listed animals are ureotelic, we need to understand what ureotelic means. Ureotelic animals excrete urea as their primary nitrogenous waste product, which is less toxic than ammonia and requires less water for excretion.

Let's analyze each animal in the list:

1. **Shark**:
- Sharks are classified as cartilaginous fish and are ureotelic. They excrete urea.

2. **Human**:
- Humans are mammals and are also ureotelic. They primarily excrete urea.

3. **Rohu**:
- Rohu is a type of fish, specifically a freshwater fish. However, it is classified as a ureotelic animal.

4. **Skate**:
- Skates are also cartilaginous fish and are ureotelic, similar to sharks.

5. **Tadpole**:
- Tadpoles are aquatic larvae of frogs and are typically ammonotelic, meaning they excrete ammonia.

6. **Frog**:
- Adult frogs are terrestrial amphibians and are ureotelic. They excrete urea.

7. **Cockroach**:
- Cockroaches are insects and are typically uricotelic, meaning they excrete uric acid.

Now, let's summarize the classification:
- Ureotelic: Shark, Human, Rohu, Skate, Frog
- Not Ureotelic: Tadpole (ammonotelic), Cockroach (uricotelic)

Counting the ureotelic animals:
- Shark: Yes
- Human: Yes
- Rohu: Yes
- Skate: Yes
- Frog: Yes
- Tadpole: No
- Cockroach: No

Total ureotelic animals = 5 (Shark, Human, Rohu, Skate, Frog)

Thus, the answer to the question is **5**.