Class 11 NEET Biology Structural Organisation in Animals

Option (2) is the answer because,
In cockroach, excretion is brought about by Malpighian tubules, fat body, nephrocytes and urecose glands.
Urecose glands are present in male cockroach of some species. They synthesise uric acid. Nephrocytes are large, colourless, ovoid, binucleate cells attached to the dorsal diaphragm in the body cavity. Fat body accumulates, produces and stores uric acid.
Phallic gland is the structure of male reproductive system of cockroach and it secretes the outer layer of spermatophore. Collaterial gland is the structure of female reproductive system of cockroach and it secretes the hard egg-case or ootheca around fertilised eggs.