Which is the best adapted for conservation of water ?

Options

A. Ammonotelism
B. Ureotelism
C. Uricotelism
D. Hydrophobism

Answer

**Step-by-Step Solution:**

1. **Understanding Excretion Types**: There are three main types of nitrogenous waste excretion: ammonotelism, ureotelism, and uricotelism. Each type has different water requirements for the excretion of waste.

2. **Ammonotelism**: This process involves the excretion of ammonia, which is highly toxic and requires a large amount of water to dilute it. Therefore, organisms that excrete ammonia need to live in aquatic environments where water is abundant.

3. **Ureotelism**: In this process, organisms convert ammonia into urea, which is less toxic than ammonia and requires less water for excretion compared to ammonotelism. However, it still requires a significant amount of water.

4. **Uricotelism**: This method involves the excretion of uric acid, which is the least toxic and least soluble in water. Uricotelic organisms, such as reptiles and birds, can excrete nitrogenous waste with minimal water loss. This adaptation is crucial for conserving water, especially in arid environments.

5. **Conclusion**: Among the three excretion types, uricotelism is the best adapted for the conservation of water because it allows organisms to excrete waste while retaining the maximum amount of water in their bodies.

6. **Final Answer**: The best adapted for conservation of water is **uricotelism**.

---