Final answer:
The roots orch/o, orchid/o, test/i, test/o all refer to 'testicles', deriving from Greek and Latin origins used in medical terminology related to the male reproductive organs.
Step-by-step explanation:
The roots of the words orch/o and orchid/o can be traced back to the Greek word orkhis, meaning "testicle," due to the shape of the bulbous root. This is also reflected in the medical terminology, where these root words generally pertain to the testicles. On the other hand, the roots test/i and test/o are also associated with testicles, coming from the Latin word 'testis,' which directly means "testicle". In medicine, these prefixes and roots are commonly used to refer to terms and conditions related to the male reproductive organs.