Q. No.The principal nitrogenous excretory compound in humans is synthesized
1. in kidneys but eliminated mostly through liver
2. in kidneys as well as eliminated by kidneys
3. in liver and also eliminated by the same through bile
4. in the liver, but eliminated mostly through kidneys
1. in kidneys but eliminated mostly through liver
2. in kidneys as well as eliminated by kidneys
3. in liver and also eliminated by the same through bile
4. in the liver, but eliminated mostly through kidneys
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Uric acid is the chief nitrogenous component of the excretory products of
1. man
2. earthworm
3. cockroach
4. frog
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What will happen if the stretch receptors of the urinary bladder wall are totally removed?
1. Urine will not collect in the bladder
2. Micturition will continue
3. Urine will continue to collect normally in the bladder
4. There will be no micturition
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Which one of the following statements is correct with respect to salt water balance inside the body of living organisms?
1. When water is not available, camels do not produce urine but store urea in tissues.
2. Salmon fish excretes lot of stored salt through gill membrane when in fresh water.
3. Paramecium discharges concentrated salt solution by contractile vacuoles.
4. The body fluids of fresh water animals are generally hypotonic to surrounding water.
Which of the following is true for excretion in humans?
| 1. | Glucose and amino acids are reabsorbed in PCT by simple diffusion. |
| 2. | DCT is impermeable to water. |
| 3. | On an average, 25-30 gm of urea is excreted out per day. |
| 4. | Maximum reabsorption occurs in the loop of Henle. |
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Refer the given figure of nephron.
Identify A, B, C, and D and select the correct option regarding them.
| 1. | A - Glomerulus - a tuft of capillaries formed by afferent arteriole. |
| 2. | B - PCT- reabsorption of \(HCO^-_3\) and selective secretion of H+ and K+ occurs here. |
| 3. | C - DCT- almost all glucose, amino acids, water, Na+, K+, and uric acid are absorbed here. |
| 4. | D - collecting duct - extends from the cortex of the kidney to the inner parts of the medulla; a large amount of water is secreted in this region. |
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Which part of the nephrons is impermeable to water?
1. Proximal convoluted tubule
2. Distal convoluted tubule
3. Ascending limb of loop of Henle
4. Descending limb of loop of Henle
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Which of the following process of urine formation takes place all along the renal tubule and collecting duct?
1. Ultrafiltration and tubular reabsorption
2. Ultrafiltration and tubular secretion
3. Tubular reabsorption and secretion
4. Anti-current mechanism and reabsorption
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In man, in which part of the uriniferous tubule reabsorption of glucose occurs?
1. Collecting tube
2. Henle's loop
3. Distal convoluted tubule
4. Proximal convoluted tubule
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What is true of urea biosynthesis?
1. Uric acid is the starting point
2. Urea is synthesized in lysosomes
3. Urea cycle enzymes are located inside mitochondria
4. Urea is synthesized in the kidney
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