Aquatic crustaceans commonly possess which excretory organ?

Aquatic crustaceans commonly possess which excretory organ?

• A. Green glands
• B. Malpighian tubules
• C. Nephridia
• D. Kidneys

Answer: (A)

Aquatic crustaceans commonly have excretory organs called green glands (antennal glands). These paired structures sit at the base of the antennae and filter waste from the blood (haemolymph), with a duct carrying it to an external pore near the antennae. This setup serves both waste removal and osmoregulation in their aquatic habitats. Other organisms use different systems—Malpighian tubules in insects, nephridia in some worms, and kidneys in vertebrates—so those options don’t match the typical crustacean excretory anatomy.

Aquatic crustaceans commonly have excretory organs called green glands (antennal glands). These paired structures sit at the base of the antennae and filter waste from the blood (haemolymph), with a duct carrying it to an external pore near the antennae. This setup serves both waste removal and osmoregulation in their aquatic habitats. Other organisms use different systems—Malpighian tubules in insects, nephridia in some worms, and kidneys in vertebrates—so those options don’t match the typical crustacean excretory anatomy.