1
1 mark
1 markWhat is urea produced from?
Fatty acids
Glucose
Amino acids
Glycerol
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Excretion (Cambridge O Level Biology)
Exam Questions
15 mins7 questions21 mark
1 markWhich of the following is a correct example of excretion in mammals?
The production of carbon dioxide from aerobic respiration.
The removal of excess salts from the blood.
The removal of undigested food from the anus.
The release of hormones from glands.
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11 mark
1 markTo remain healthy, a person must be able to excrete a number of waste products produced as a result of metabolism.
A list of excretory products is given below.
Which of the following would be lost from both the kidneys and lungs?
Water
Carbon dioxide
Glucose
Urea
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21 mark
1 markWhich of the following organs are responsible for removing excretory products from the blood?
Bladder and kidneys
Kidneys and lungs
Lungs and liver
Bladder and liver
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11 mark
1 markWhich row of the table below correctly displays the correct roles of the following organs in processing waste in the human body?
| kidneys | liver | lungs | |
| A | excretes urea | excretes amino acids | removes carbon dioxide |
| B | removes carbon dioxide | deamination of amino acids | excretes urea |
| C | removes urea from blood | deamination of amino acids | removes carbon dioxide |
| D | excretes urine | deamination of urea | removes carbon dioxide |
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