Excretion via Lungs and Liver — NEET Biology
📚 Practice ConceptOur lungs remove large amounts of CO₂ (approximately 200mL/minute) and also significant quantities of water every day. Liver, the largest gland in our body, secretes bile-containing substances like bilirubin, biliverdin, cholesterol, degraded steroid hormones, vitamins and drugs. Most of these substances ultimately pass out along with digestive wastes.
Match the following accessory excretory organs in Column I with the primary excretory substances they eliminate in Column II. Column I A. Lungs B. Sweat glands D. Sebaceous glands E. Saliva Column II 1. Bilirubin 2. CO2 3. Sterols 4. Lactic acid 5. Small amounts of nitrogenous wastes
View solution & NCERT explanation
Correct answer: A — A-2, B-1, C-4, D-3, E-5
The core concept is the specific excretory substances eliminated by various accessory excretory organs. A. Lungs: NCERT states, "Our lungs remove large amounts of CO2... and also significant quantities of water every day." So, Lungs match with CO2 (2). B. Liver: NCERT states, "Liver... secretes bile-containing substances like bilirubin, biliverdin, cholesterol, degraded steroid hormones, vitamins and drugs." So, Liver matches with Bilirubin (1). C. Sweat glands: NCERT states, "Sweat produced by the sweat glands is a watery fluid containing NaCl, small amounts of urea, lactic acid, etc." So, Sweat glands match with Lactic acid (4). D. Sebaceous glands: NCERT states, "Sebaceous glands eliminate certain substances like sterols, hydrocarbons and waxes through sebum." So, Sebaceous glands match with Sterols (3). E. Saliva: NCERT mentions, "small amounts of nitrogenous wastes could be eliminated through saliva too?" So, Saliva matches with Small amounts of nitrogenous wastes (5). Therefore, the correct match is A-2, B-1, C-4, D-3, E-5. The final answer is A.
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.