Excretory organs of arthropods are

Options

A. Green glands
B. Green gland and malpighian tubules
C. Malpigian tubules
D. Nephridia.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the excretory organs of arthropods. Arthropods include various organisms such as insects, crustaceans, and arachnids.

2. **Identifying Excretory Organs**: Excretory organs are responsible for the removal of waste products from the body. In arthropods, there are specific structures that serve this function.

3. **Analyzing the Options**:
- **Option 1: Green glands**: These are indeed excretory organs found in crustaceans. They help in the excretion of waste.
- **Option 2: Green glands and Malpighian tubules**: This option includes both green glands and Malpighian tubules. Malpighian tubules are the primary excretory organs in many terrestrial arthropods, such as insects.
- **Option 3: Malpighian tubules**: While Malpighian tubules are significant excretory organs, this option does not include green glands, which are also important in certain arthropods.
- **Option 4: Nephridia**: Nephridia are excretory organs found in annelids (segmented worms) and are not present in arthropods.

4. **Conclusion**: The most accurate answer is **Option 2: Green glands and Malpighian tubules**, as it encompasses the excretory organs found in both crustaceans and terrestrial arthropods.

### Final Answer:
The excretory organs of arthropods are **Green glands and Malpighian tubules**.

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