Functional units of testes are ____?
Rete testes
Seminiferous tubules
Vas efferens
Epididymis
Seminiferous tubules are functional units of testes that merge into network of tiny tubules called rete testes. Rete testes are secondary sex organs in male.
Secondary sex organs in males consists of accessory ducts and accessory glands.
The male sex accessory ducts include rete testis, vasa efferentia, epididymis and vas deferens. rete testes and epididymis are secondary/ accessory sex organs.
The male accessory glands include paired seminal vesicles, a prostate and paired bulbourethral glands.
Hence option B is correct.