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Excretory Products and their Elimination Test 32

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Excretory Products and their Elimination Test 32
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  • Question 1
    1 / -0
    In Frog, nitrogeneous waste products are eliminated as
    Solution
    Adult Frog excretes urea because urea is less toxic than ammonia and can be concentrated in urine and excreted at a slower rate. Whereas tadpole excretes ammonia because it lives in water and has the large volume of water that is needed for the elimination of ammonia. It can eliminate ammonia into surrounding water rapidly when it is formed. Hence In Frog, nitrogenous waste products are eliminated as Urea in adult and ammonia in tadpole
    So, the correct answer is 'Urea in adult and ammonia in tadpole'.
  • Question 2
    1 / -0
    First step in urine formation is
    Solution
    Glomerular filtration is the first step in urine formation. Glomerular blood is filtered through filtration slits present in Bowman's capsule. The Bowman's capsule collects the filtrate and it enters the tubules of the nephron. Glomerular filtration is also called as ultrafiltration because filtrate consists of almost all constituents of plasma except proteins. Hence the first step in urine formation is Ultrafiltration.
    So, the correct answer is 'Ultrafiltration'.
  • Question 3
    1 / -0
    Excretory product of spider is
    Solution
    The excretory product of spider is guanine. It is formed as a result of nucleotide metabolism. It does not require water for elimination because it is less soluble than uric acid and helps to conserve more water.
    So, the correct answer is 'Guanine'.
  • Question 4
    1 / -0
    In the absence of loop of Henle
    Solution
    The loop of Henle is a hairpin-shaped structure present in the nephron. its important function is the absorption of water from the tubular lumen. which result in the production of hypertonic urine (concentrated urine).If the loop of Henle is absent the absorption of water is decreased and will result in the production of hypotonic urine(Dilute urine).Hence in the absence of the loop of Henle urine will be hypotonic.
    So, the correct answer is 'Urine will be hypotonic'.
  • Question 5
    1 / -0
    Which one is both osmoregulator as well as nitrogenous product?
    Solution
    Urea is both osmoregulator as well as nitrogenous waste. Urea is produced in the liver and excreted through urine. The urea helps in osmoregulation by participating in counter current system, small amounts of urea enter the thin segment of the ascending limb of Henle’s loop which is transported back to the interstitium by the collecting tubule.  
    So, the correct answer is 'Urea'.
  • Question 6
    1 / -0
    Which of the following  is not a part of nephron?
    Solution
    Collecting ducts are straight tube present in kidney, many of which converge and open into the renal pelvis through medullary pyramids in the calyces. The DCT (Distal convoluted tubules) of many nephrons open into collecting duct. Hence collecting duct is not a part of the nephron.
    So, the correct answer is 'Collecting duct'.
  • Question 7
    1 / -0
    In the accompanying diagram of urine formation, identify a, b, c and d.

    Solution
    a) Pressure filtration - GLOMERULUS -The hydrostatic pressure in the glomerulus is the driving force that pushes filtered out of the capillaries and into slits in the nephron. Hence pressure filtration. 
    b) Re-absorption- PROXIMAL CONVOLUTED TUBULE(PCT) - it is lined with Cuboidal epithelium with brush border. It increases the surface area for reabsorption. Almost all essential nutrients and 70-80 % of electrolytes and water are reabsorbed by PCT.
    c) Secretion-DISTAL CONVOLUTED TUBULE(DCT)- in distal convoluted tubule selective secretion of hydrogen and potassium ions and NH3 to maintain the pH and sodium-potassium balance in the blood.
    d) Collection of urine -COLLECTING DUCT -Collecting ducts are straight tube present in kidney, many of which converge and open into the renal pelvis through medullary pyramids in the calyces. The DCTs(Distal convoluted tubules) of many nephrons open into collecting duct. Hence collecting duct is not a part of the nephron. Hence it collects formed urine from DCT.
    So, the correct answer is 'a- Pressure filtration, b- Re-absorption, c- Secretion, d- Collection of urine'.
  • Question 8
    1 / -0
    Bidders canal occurs in
    Solution
    In the male frog, the testes are attached to the kidney. Bidders canal is present inside the kidney of a frog. 10 -12 pairs of vasa differentia arises from testes and then enter the kidneys, where they open into the bidder's canal. The bidders canal then opens to the urinogenital duct which in turn open into the cloaca. Hence Bidders canal occurs in the kidney of the frog.
    So, the correct answer is 'Kidney of frog'.
  • Question 9
    1 / -0
    Longest loop of Henle occurs in
    Solution
    The loop of Henle is U shaped tube that conducts urine within a nephron from proximal convoluted tubule to the distal convoluted tubule. The longest loop of Henle occurs in Kangaroo Rat. The long loop of Henle helps to minimize water loss and maximize reabsorption.
    So, the correct answer is 'Kangaroo Rat'.
  • Question 10
    1 / -0
    Proxinal convoluted tubule (PCT) is lined with
    Solution
    Proximal convoluted tubule (PCT) is lined with cuboidal epithelium with brush border. It increases the surface area for reabsorption. Almost all essential nutrients and 70-80 % of electrolytes and water are reabsorbed by PCT.
    So, the correct answer is 'Cuboidal epithelium with brush border".
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