which of the following are not excretory organs of arthopods ?
1 . malphigian tubules 2 . coxal glands 3 . green glands 4 . metanephridia 

Dear student,

Correct answer is 4. Metanephridia is not an excretory organ of Arthropoda.

Various Excretory organs that are  found in Arthropoda are:
1. Nephridia
 2. Coxal Glands
 3. Green Gland
4. Shell Glands 
5. Malpighian Tubules 
6. Hepatopancreas
7. Fat Body
8. Exoskeleton 
9. Intestinal Caeca 
10. Midgut Epithelium 
11. Pericardial Cells 
12. Nephrocytes 
13. Oenocytes.

Regards