1. Which one is an example of excretion?
A. Water vapour passing out of the stomata of the leaf.
B. Glucose present in urine passing out through the urethra.
C. Oxygen, produced by photosynthesis, passing out of the leaf.
D. Water present in the faeces passing out of the gut.
2. The four structure listed are part of the human excretory system.
I – bladder II – kidney III – ureter IV – urethra
In which order does a molecule of urea pass through these structure?
A. 1 –> 2 –> 3 –> 4
B. 1 –> 4 –> 3 –> 2
C. 2 –> 1 –> 3 –> 4
D. 2 –> 3 –> 1 –> 4
3. Blood samples from three veins in the body were tested for the concentration of oxygen, carbon dioxide and urea. The results, in arbitrary units. are shown in the table.
Which veins were sampled?
4. After a meal of meat, the urine would be expected to contain?
A. decreased concentrations of urea
B. increased concentrations of urea
C. decreased concentration of amino acids
D. increased concentration of amino acids
5. The diagram represents the process of dialysis in a kidney machine.
Which substance would not be present in the dialysis fluid flowing in?
A. Glucose
B. Salt
C. Urea
D. Water
=========================================================
Answer: CDBBA
Biology Notes 