Assertion   :       Aquatic mammals like whales and seals are said to be ureotelic animals.

Reason      :       It is because of the fact that their main nitrogenous waste product is urea.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Death ensues if waste products are not removed from the body.

Reason      :       Excretory system removes the nitrogenous waste products from the body.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Camel can go without water for long periods.

Reason      :       Camels stores water in the pouches of their rumen and fat in their hump.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Renal threshold of glucose is said to be 180 mg per 100 ml.


Reason      :       Glucose starts appearing in the urine when its blood level exceed 180 mg per 100 ml of blood.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Earthworms excrete both ammonia and urea.

Reason      :       Excretion in earthworm depends on the environment.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       If human urine is allowed to stand for some time, it smells strongly of ammonid.


Reason      :       Main constituent of human urine is Ammonia.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
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Assertion   :       Birds can considerably reduce water loss in the urine.

Reason      :       Birds store urine along with faeces in the cloaca.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Ammonotelic organisms are not

1.Bony Fishes

2.Aquatic Amphibians

3.Aquatic Insects

4.Marine fishes
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The process of reabsorption occurs is verified by

  • Comparison between urine released and Filtrate formed

  • Release of Renin

  • Release of Rennin

  • Release of ADH

Assertion   :       The glomerular filtrate resembles the protein free plasma in composition and osmotic pressure.

Reason      :       The glomerular capillary wall and inner membrance of Bowman’s capsule are impermeable to large molecules.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion             :       Kidneys maintain the osmotic concentration of the blood.

Reason      :       Kidneys eliminate either hypotonic or hypertonic urine according to the need of the body.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion    :       During micturition, urine is prevented from flowing back into the ureters.

Reason      :       Urethral sphincters relax during micturition.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Secreting hypotonic urine is effective in reducing urinary loss of water.


Reason      :       Hypotonic urine is more concentrated and higher in osmotic pressure than the blood.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       In birds and reptiles, main excretory product is the combined form of urine and faeces.

Reason      :       Birds and reptiles have no separate chamber for excretion of urine and faeces.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Hemodialysis can save and prolong the life of uremic patients.

Reason      :       Waste products like urea can be removed from the blood by the process of hemodialysis.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Birds drink very little water and insects never consume water.

Reason      :       Birds and insects are uricotelic with negligible water requirement to eliminate nitrogenous waste.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion :       The antidiuretic hormone increases the water permeability of distal convoluted tubule.

Reason    :       In absence of ADH, water re-absorption is considerably reduced.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion  :       In the descending limb of loop of Henle, the urine is hypertonic, while in ascending limb of loop of Henle, the urine is Hypotonic.

Reason     :      Descending limb is impermeable to Na+, while ascending limb is impermeable to H2O.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Which of the following nitrogenous wastes is most toxic form and requires a lot of water for removal?

1.Ammonia

2.Urea

3.Uric acid

4.Creatinine
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Which of the following layers comes first when one goes from outside to the inside of Bowman's capsule?

  • Endothelium

  • Epithelium of Bowman's Capsule

  • Basement Membrane

  • Macula Densa layer

Glomerular Filtration is not

  • Ultrafiltration

  • Occurs via three layers

  • Filtrate has to pass through filtration slits or slit pores

  • Filtrate finally reached to glomerular capillary

Podocytes are not

  • Arranged in intricate manner

  • Left with some spaces called filtration slits

  • Having slit pores

  • Found in 2nd layer of filtration membrane

Ammonotelic organisms excrete out

1.Ammonia

2.Ammonium ions

3.Ammonium sulfate

4.Ammonium nitrate
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The production of urea and uric acid is because of

  • Conservation of water

  • Terrestrial adaptation

  • Terrestrial adaptation for conservation of water

  • Advancement of organism in comparison to all water animals

Ammonia is converted into urea in which of the following organs of Ureotelic organisms?

1.Liver

2.Kidney

3.Urinary bladder

4.Gut
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Urea remains in the kidney matrix of which of the following organisms?

1.Aquatic Insects

2.Aquatic amphibians

3.Bony fishes

4.Marine fishes
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Kidney matrix retains some amount of urea to

1.Maintain a desired osmolarity

2.Maintain metabolism

3.Maintain balance of the body

4.Maintain micturition
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Which of the following is not uricotelic?

1.Reptiles

2.Birds

3.Land snails

4.All insects
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The invertebrates have which of the following excretory structures?

1.Simple Tubular forms

2.Complex tubular organs

3.Kidneys

4.Interstitial lamina
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Which of the following has not the protonephridia as an excretory organ?

  • Rotifers

  • Amphioxus

  • Planaria

  • Earthworm

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Practice Zoology Quiz Questions and Answers