Excretion in humans — Paper 2 · IGCSE Biology (9-1) 0970

22 The table shows the presence or absence of chemicals in solution in different parts of a healthy kidney. Which row is correct? ; blood plasma fluid entering ar chemical . ; fluid in ureter in glomerulus kidney tubule A glucose Jv x x key B protein Jv J J v¥ = present Cc salts v x x X = absent D urea v Jv v

1 marks

Answer: D

This question in 0970/21 May/June 2018

21 As we breathe out, … 1 … is … 2 … through the lungs. Which words correctly complete gaps 1 and 2? 1 2 A carbon dioxide excreted B carbon dioxide respired C oxygen excreted D oxygen respired

1 marks

Answer: A

This question in 0970/22 Oct/Nov 2018

22 A person carries out vigorous exercise without drinking any water. What would happen to the concentration and volume of the person’s urine immediately after exercise? urine urine concentration volume A decrease decrease B decrease increase C increase decrease D increase increase

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2018

25 What is a function of the liver? A converting bile to urea B converting urea to amino acids C deamination of amino acids D deamination of carbon dioxide

1 marks

Answer: C

This question in 0970/21 May/June 2019

25 The diagram shows the first part of a kidney tubule and its blood supply. During filtration, protein molecules do not pass through the wall of the glomerulus. Which part contains the highest concentration of protein? B A C direction of blood flow D

1 marks

Answer: D

This question in 0970/22 May/June 2019

21 Lactic acid builds up in the muscles during vigorous exercise. During recovery, how is this lactic acid removed? A aerobic respiration of lactic acid in the liver B anaerobic respiration of lactic acid in the muscles C excretion of lactic acid by the lungs D removal of lactic acid by the alimentary canal

1 marks

Answer: A

This question in 0970/22 Oct/Nov 2019

25 A patient has dye injected into the blood supply to his kidneys. The dye appears in his excretory system as shown. key dye no dye Which part is blocked? A the kidney B the ureter C the bladder D the urethra

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2019

23 In healthy people, which substance is completely reabsorbed into the blood from the kidney tubules? A glucose B salts C urea D water

1 marks

Answer: A

This question in 0970/21 May/June 2020

23 What is filtered out of the blood in the glomerulus into the kidney tubule? glucose urea A v v key B Jv x J/ = yes Cc x v X =no D x x

1 marks

Answer: A

This question in 0970/22 May/June 2020

22 How do the concentrations of glucose and urea in urine compare to their concentrations in blood plasma? glucose urea concentration concentration in in urine (compared urine (compared to to blood plasma) blood plasma) A higher lower B higher same C same same D lower higher

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2020

19 What are the main vessels carrying blood to and from the kidney? to kidney from kidney A pulmonary artery pulmonary vein B pulmonary vein pulmonary artery C renal artery renal vein D renal vein renal artery

1 marks

Answer: C

This question in 0970/21 May/June 2021

25 Which statement about urea is correct? A Urea is formed from excess amino acids in the kidneys and excreted by the liver. B Urea is formed from excess glucose in the liver and egested by the kidneys. C Urea is formed from excess glucose in the kidneys and egested by the liver. D Urea is formed from excess amino acids in the liver and excreted by the kidneys.

1 marks

Answer: D

This question in 0970/21 May/June 2021

31 How will the composition of a pregnant woman’s blood change as it passes through the placenta? concentration of concentration of dissolved oxygen urea A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: B

This question in 0970/21 May/June 2021

25 The diagram shows some of the organs in the human body. 1 2 3 Which row matches the function to the correct organ? excretes carbon excretes urea produces urea dioxide A 1 2 3 B 1 3 2 C 2 3 1 D 2 1 3

1 marks

Answer: B

This question in 0970/22 May/June 2021

1 All living things can remove toxic materials and other substances that are in excess of requirements. What is this process called? A egestion B excretion C nutrition D respiration

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2021

24 The diagram shows a mammalian kidney. X renal artery renal vein Z Y What are areas X, Y and Z? X Y Z A cortex medulla ureter B cortex ureter medulla C medulla cortex ureter D medulla ureter medulla

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2021

23 Which statement correctly explains the difference in glucose concentration in the kidney tubule between X and Y? glomerulus X Y kidney tubule A The glucose concentration is higher at X than at Y because glucose moves out of the kidney tubule by osmosis. B The glucose concentration is higher at X than at Y because glucose has been actively transported out of the kidney tubule. C The glucose concentration is higher at Y than at X because glucose diffuses into the kidney tubule. D The glucose concentration is higher at Y than at X because glucose is actively transported into the kidney tubule.

1 marks

Answer: B

This question in 0970/21 May/June 2022

23 The table shows the concentration of sodium ions in blood plasma, in glomerular filtrate (the liquid that passes through the glomerulus) and in urine. blood glomerular urine plasma filtrate concentration of sodium ions 141 141 127 / arbitrary units What is the percentage concentration of sodium ions reabsorbed in the kidney tubules? A 0.0% B 9.9% C 10.9% D 14.0%

1 marks

Answer: B

This question in 0970/22 May/June 2022

23 A person eats foods containing proteins. Some of the amino acids in the proteins are converted to urea and excreted from the body. 1 2 3 proteins amino acids urea urine Which row identifies the sites of processes 1, 2 and 3? site of process 1 site of process 2 site of process 3 A stomach liver kidney B liver kidney bladder C stomach kidney liver D liver stomach kidney

1 marks

Answer: A

This question in 0970/22 Oct/Nov 2022

23 Which row shows where glucose will be found in the body of a healthy human after eating a meal? renal artery renal vein glomerulus nephron ureter A yes no yes yes yes B yes yes no no no C yes yes yes yes no D no yes no no yes

1 marks

Answer: C

This question in 0970/21 May/June 2023

23 The diagram shows a cross-section of a kidney. R P Q What are the correct names for structures P, Q and R? P Q R A urethra cortex medulla B ureter medulla cortex C urethra medulla cortex D ureter cortex medulla

1 marks

Answer: B

This question in 0970/22 May/June 2023

25 Which row shows an organ and the substance it excretes? substance organ excreted A bladder water B kidney ions C lung oxygen D urethra urea

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2023

25 In healthy people, which substance is completely reabsorbed into the blood from the kidney nephrons? A glucose B salts C urea D water

1 marks

Answer: A

This question in 0970/21 May/June 2024

24 Which part of an amino acid is removed during deamination? A the carbon-containing part B the nitrogen-containing part C the oxygen-containing part D the iron-containing part

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2024

25 Which process happens in a glomerulus in the kidney? A assimilation B deamination C filtration D reabsorption

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2024

20 What is a role of the glomerulus? A assembling amino acids into proteins B filtration of water, glucose, urea and ions from the blood C reabsorption of glucose, ions and water back into the blood D removal of the nitrogen-containing part of amino acids to form urea

1 marks

Answer: B

This question in 0970/21 May/June 2025

23 Which organ produces urea? A bladder B kidney C liver D pancreas

1 marks

Answer: C

This question in 0970/22 May/June 2025

14 Which row names the blood vessel containing the highest blood urea concentration and the blood vessel containing the lowest blood urea concentration? highest blood urea lowest blood urea concentration concentration A hepatic artery hepatic vein B hepatic vein renal vein C hepatic portal vein renal artery D renal vein hepatic portal vein

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2025