In which of these animals , antennal gland functions as excretory organ ?

Options

A. Cockroach
B. Planaria
C. Prawn
D. Earthworm

Answer

To solve the question "In which of these animals does the antennal gland function as an excretory organ?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Antennal Gland**:
- The antennal gland, also known as the maxillary gland, is an excretory organ found in some crustaceans. It is located in the head region and opens at the base of the antenna.

2. **Analyzing the Options**:
- **Option A: Cockroach**:
- The excretory system of a cockroach consists of Malpighian tubules, not antennal glands. Therefore, this option is incorrect.

- **Option B: Planaria**:
- Planaria have a different excretory system that includes protonephridia, which are not related to antennal glands. Thus, this option is also incorrect.

- **Option C: Prawn**:
- Prawns are crustaceans, and in them, the antennal glands (or maxillary glands) serve as excretory organs. This makes this option correct.

- **Option D: Earthworm**:
- Earthworms possess nephridia as their excretory organs, not antennal glands. Hence, this option is incorrect.

3. **Conclusion**:
- After analyzing all the options, the correct answer is **C: Prawn**, as the antennal gland functions as an excretory organ in this animal.