Porifers and coelenterates are

Options

A. Ammonotelic
B. Ureotelic
C. Uricotelic
D. Both B and C.

Answer

**Step-by-Step Solution:**

1. **Understanding the Groups**:
- Porifers (sponges) and Coelenterates (Cnidarians) are two distinct groups of animals in the animal kingdom.
- Both groups are simple organisms and are primarily aquatic.

2. **Excretion in Animals**:
- Organisms need to eliminate nitrogenous waste produced from metabolism.
- There are three main types of nitrogenous waste excretion: Ammonotelic, Ureotelic, and Uricotelic.

3. **Definition of Terms**:
- **Ammonotelic**: These organisms excrete nitrogenous waste primarily in the form of ammonia, which is highly soluble in water. This method is common in aquatic organisms.
- **Ureotelic**: These organisms excrete urea as their primary nitrogenous waste. This is less toxic than ammonia and requires less water for excretion.
- **Uricotelic**: These organisms excrete uric acid, which is even less toxic and conserves water, making it suitable for terrestrial organisms.

4. **Excretion in Porifers and Coelenterates**:
- Both Porifers and Coelenterates are primarily aquatic and have a simple body structure.
- They excrete nitrogenous waste mainly in the form of ammonia due to their aquatic environment, which allows for the easy diffusion of ammonia into the surrounding water.

5. **Conclusion**:
- Since both Porifers and Coelenterates primarily excrete ammonia, they are classified as Ammonotelic organisms.

**Final Answer**: Porifers and Coelenterates are Ammonotelic.

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