First time exertory system evolved in the organisms of

Options

A. Platyhelminthes
B. Nematoda
C. Annelida
D. Arthropoda

Answer

**Step-by-Step Solution:**

1. **Understanding the Excretory System:**
- The excretory system is responsible for the removal of waste products from the body. It plays a crucial role in maintaining homeostasis by regulating the composition of body fluids.

2. **Identifying the First Organisms with Excretory Systems:**
- The question asks about the first organisms in which the excretory system evolved. We need to analyze different groups of organisms to determine which one had a more advanced excretory system.

3. **Analyzing Different Groups:**
- **Platyhelminthes (Flatworms):** They possess flame cells for excretion, which are simple and operate through diffusion. These are not considered true excretory glands.
- **Nematoda (Roundworms):** They have a simple excretory system with renette glands, which also do not qualify as a true excretory system.
- **Annelida (Segmented Worms):** They have nephridia, which are primitive excretory structures. However, they are still considered simple.
- **Arthropoda (Insects and Crustaceans):** This group has a more advanced excretory system, including Malpighian tubules and green glands. These structures allow for more efficient waste removal.

4. **Conclusion:**
- Based on the analysis, the first true excretory system evolved in the Arthropoda group, which includes insects and crustaceans. Therefore, the correct answer is **Arthropoda**.

**Final Answer:**
The first excretory system evolved in the organisms of **Arthropoda**.

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