Final answer:
The disease caused by roundworms blocking lymphatic channels is called lymphatic filariasis. It is caused by infection with parasitic roundworms that block the lymphatic vessels, leading to swelling of the limbs and other parts of the body.
Step-by-step explanation:
The disease caused by roundworms blocking lymphatic channels is called lymphatic filariasis. Lymphatic filariasis is caused by infection with parasitic roundworms that are transmitted to humans through mosquito bites. These worms block the lymphatic vessels, leading to swelling of the limbs and other parts of the body.