Identify the incorrectly matched pair :

Options

A. Gizzard - Digestive system
B. Malpighian tubules - Excretory system
C. Spiracles - Circulatory system
D. Ganglia - Nervous system

Answer

To identify the incorrectly matched pair from the given options, we will analyze each option one by one:

1. **Gizzard - Digestive System**:
- The gizzard is a muscular part of the digestive system found in some animals, including earthworms and birds. It helps in grinding food. This pair is correctly matched.

2. **Malpighian Tubules - Excretory System**:
- Malpighian tubules are excretory organs found in many insects, such as cockroaches. They play a crucial role in the excretion of waste products. This pair is also correctly matched.

3. **Spiracle - Circulatory System**:
- Spiracles are openings found in the exoskeleton of insects that allow air to enter the respiratory system. They are not part of the circulatory system. This pair is incorrectly matched.

4. **Ganglia - Nervous System**:
- Ganglia are clusters of nerve cell bodies and are integral components of the nervous system. This pair is correctly matched.

Based on the analysis, the incorrectly matched pair is **Spiracle - Circulatory System**.

### Final Answer:
The incorrectly matched pair is **Spiracle - Circulatory System**.