In crustaceans, which excretory organ is typical of aquatic species?

In crustaceans, which excretory organ is typical of aquatic species?

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

Answer: (A)

The main idea is how crustaceans excrete waste in water while keeping their internal balance stable. In aquatic crustaceans, the typical excretory organ is the antennal or green glands. These tubule-like structures filter waste from the hemolymph and pass it to an excretory duct that opens near the base of the antennae. This setup suits life in water, where waste products like ammonia can be quickly dumped into the surrounding environment, helping regulate salts and water balance. Other options come from different animal groups or lifestyles: Malpighian tubules are common in insects that live on land, nephridia are typical of some annelids, and kidneys are vertebrate-type organs not characteristic of crustaceans.

The main idea is how crustaceans excrete waste in water while keeping their internal balance stable. In aquatic crustaceans, the typical excretory organ is the antennal or green glands. These tubule-like structures filter waste from the hemolymph and pass it to an excretory duct that opens near the base of the antennae. This setup suits life in water, where waste products like ammonia can be quickly dumped into the surrounding environment, helping regulate salts and water balance. Other options come from different animal groups or lifestyles: Malpighian tubules are common in insects that live on land, nephridia are typical of some annelids, and kidneys are vertebrate-type organs not characteristic of crustaceans.