Class 12 Biology · Chapter 1 · Test 2
Osmoregulation and Nitrogenous Wastes
42 MCQs
42 questions · 30 min · 42 marks
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Sample questions
The first 5 of 42. Try each one, then tap to see the answer.
Question 1
Marine fishes compensate for water loss by:
- AProducing dilute urine
- BDrinking seawater
- CAbsorbing salt
- DReducing thirst
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Answer: B
Marine animals drink seawater continuously to make up for the water lost by osmosis.
Question 2
How do freshwater fish primarily gain water?
- ADrinking
- BActive transport
- COsmosis
- DDiffusion
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Answer: C
Water enters freshwater animals continuously by osmosis across permeable surfaces such as gills.
Question 3
Which waste product requires the most water for excretion?
- AAmmonia
- BUrea
- CUric acid
- DCreatinine
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Answer: A
One gram of ammonia needs 500 mL of water to reach a non-toxic level.
Question 4
Which nitrogenous waste is the least toxic and water-insoluble?
- AUrea
- BAmmonia
- CUric acid
- DNitrate
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Answer: C
Uric acid is the least toxic and is less soluble in water so it precipitates.
Question 5
In which part of the body does the conversion of ammonia to urea take place?
- ALiver
- BMuscles
- CBrain
- DSmall intestine
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Answer: A
Terrestrial animals convert ammonia to urea in the liver.
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