Excretory Products and their Elimination MCQ practice test for NEET Biology, based on NEET syllabus Unit 5 (Human Physiology) and NCERT Class XI. Each set has 15 NEET-pattern MCQs in 15 minutes. Questions cover modes of excretion (ammonotelism, ureotelism, uricotelism), excretory structures of animals, the structure of the human kidney and nephron, urine formation by filtration, reabsorption and secretion, functions of the tubules, the counter current mechanism, regulation of kidney function by ADH, the renin-angiotensin mechanism and ANF, micturition, the role of other organs in excretion, and disorders such as uraemia, renal failure, renal calculi and glomerulonephritis, with haemodialysis and kidney transplantation. Previous-year NEET questions are mixed with new questions.