Question

The organs in excretory system of cockroach, associated with conversion of nitrogenous excretory substances into uric acid are _____.

• A. Malpighian tubules
• B. Hepatic Caeca
• C. Uricose glands
• D. Fat bodies

Answer 1

The correct option is A

Malpighian tubules

Cockroach is uricotelic. In cockroach followings structures help in excretion:

1. Malpighian tubules
2. Fat bodies
3. Nephrocytes
4. Cuticle
5. Uricose glands in some species.

Malpighian tubules: Malpighian tubules are attached at the junctions of midgut and hindgut. Each tubule is lined by glandular and ciliated cells. They absorb nitrogenous wastes and convert them into uric acid, which is let into the hind gut and excreted out through the anus along with the feces.
Fat bodies: Some fat bodies are also present in haemocoel, which havemycetocytes, urate cells, oenocytes and trophocytes.
Nephrocytes: Nephrocytes present in lateral wall of heart help in excretion and store nitrogenous waste.
Uricose glands: In some species, in male uricose glands are present on periphery of mushroom glands. These glands synthesize uric acid. Malpighian tubules are analogous to mammalian kidney. Fat bodies are analogous to vertebrate liver.