NEET Practice Questions (MCQs) with Answers & Solutions

Uricotelic organisms excrete nitrogenous waste primarily in the form of uric acid. This mode of excretion is found in reptiles and birds. Uric acid is less toxic and requires less water to excrete, which is advantageous for these animals that often live in arid environments.

Haemodialysis is also called as artificial kidney. It is a medical procedure that filters waste products and excess fluids from the blood when the kidneys are not functioning properly.

The liver is considered an accessory excretory organ because it plays a crucial role in detoxifying harmful substances and producing bile, which aids in digestion and excretion of waste products.

Haemodialysis helps patients suffering from uremia, a condition where there is an accumulation of waste products in the blood due to kidney failure. The procedure helps to remove these waste products and excess fluid.

Lungs primarily expel carbon dioxide (COâ‚‚) and water vapor. When we exhale, our breath contains these two components as waste products of cellular respiration. This process helps in maintaining the body's acid-base balance.

The glomeruli are located in the cortex of the kidney. The cortex is the outer part of the kidney where the glomeruli filter blood to form urine. This filtered blood then moves into the renal tubules for further processing.

A kidney stone is typically a crystallized salt, such as calcium oxalate, formed in the renal pelvis. These stones can cause severe pain and block the flow of urine, leading to various complications if not treated.

The Proximal Convoluted Tubule (PCT) is the region of the nephron where maximum reabsorption of useful substances like glucose, amino acids, and ions occurs. This is due to the presence of a large surface area and numerous microvilli that facilitate reabsorption.

The excretory organs of a cockroach are the Malpighian tubules. These tubules help in the removal of nitrogenous wastes from the hemolymph and play a crucial role in osmoregulation.

Juxta glomerular cells of the renal cortex synthesize the hormone renin. Renin plays a key role in the regulation of blood pressure and electrolyte balance by activating the renin-angiotensin-aldosterone system (RAAS).