NEET (UG) 2023 — Question 164

In cockroach, excretion is mainly by Malpighian tubules, but the fat body, nephrocytes and uricose glands also help in excretion. The fat body stores uric acid, nephrocytes are excretory cells attached to the dorsal diaphragm, and uricose glands synthesise uric acid. Phallic gland is a male reproductive accessory gland that secretes the outer layer of the spermatophore, so it is not excretory. Collaterial glands are female reproductive glands that secrete the ootheca around fertilised eggs, so they are not excretory. Thus the excretory structures among the given options are B (uricose gland), C (nephrocytes) and D (fat body). Therefore the correct option is B.