Answer: Nitrogenous waste
Step-by-step explanation:
As the nutrients-rich blood enters the glomerulus of the kidney by renal artery. The blood pressure in the capillaries of the glomerulus forces water, urea, nitrogenous compounds, glucose etc to be filtered into the bowman's capsule. This process is called ultra filtration.
Thus, the during ultrafiltration NITROGENOUS WASTE is filtered off.