Diffusion — Paper 1 · IGCSE Sciences - Co-ordinated (Double) 0654

6 The diagram shows a section through an alveolus and a blood capillary. capillary alveolus Why does oxygen move from the alveolus to the blood capillary? A It diffuses through because of a difference in concentration. B It is forced through the wall of the alveolus by air pressure. C It passes through because carbon dioxide is coming out. D It is sucked in by movement of blood in the capillary.

1 marks

Answer: A

This question in 0654/11 May/June 2008

7 The diagram shows an alveolus, a blood capillary and some red blood cells. key alveolus Hb = haemoglobin HbO2 = haemoglobin combined with oxygen P Q R HbO2 S Hb HbO2 Hb red blood cells blood capillary What is the direction of blood flow in the capillary and the direction of diffusion of oxygen? oxygen blood flow diffusion A P to S Q B P to S R C S to P Q D S to P R

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2013

3 How does oxygen pass from the alveoli to the blood capillaries in the lungs? A diffusion B evaporation C secretion D transpiration

1 marks

Answer: A

This question in 0654/11 May/June 2014

3 How does oxygen pass from the alveoli to the blood capillaries in the lungs? A diffusion B evaporation C secretion D transpiration

1 marks

Answer: A

This question in 0654/12 May/June 2014

6 How does oxygen pass from the alveoli to the blood capillaries in the lungs? A diffusion B evaporation C secretion D transpiration

1 marks

Answer: A

This question in 0654/13 May/June 2014

7 Why does oxygen move from an alveolus to a blood capillary? A It diffuses through because of a difference in concentration. B It is forced through the wall of the alveolus by air pressure. C It passes through because carbon dioxide is coming out. D It is pulled in by movement of blood in the capillary.

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2014

7 Why does oxygen move from an alveolus to a blood capillary? A It diffuses through because of a difference in concentration. B It is forced through the wall of the alveolus by air pressure. C It passes through because carbon dioxide is coming out. D It is pulled in by movement of blood in the capillary.

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2014

2 A carbon dioxide molecule diffuses into a plant cell. In which order does it pass through these structures? A cell membrane → cell wall → cytoplasm B cell wall → cell membrane → cytoplasm C cytoplasm → cell membrane → cell wall D cytoplasm → cell wall → cell membrane

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2014

3 What is diffusion? A the net movement of molecules from a region of their higher concentration to a region of their lower concentration down a concentration gradient B the net movement of molecules from a region of their higher concentration to a region of their lower concentration up a concentration gradient C the net movement of molecules from a region of their lower concentration to a region of their higher concentration down a concentration gradient D the net movement of molecules from a region of their lower concentration to a region of their higher concentration up a concentration gradient

1 marks

Answer: A

This question in 0654/11 May/June 2015

3 Diffusion occurs between the two solutions shown. membrane permeable to glucose and water 10 cm3 of 10% 10 cm3 of 2% glucose solution glucose solution What is the final concentration of glucose solution in each region? A 2% B 6% C 8% D 12%

1 marks

Answer: B

This question in 0654/13 May/June 2015

2 The diagram shows an alveolus and surrounding capillary. capillary alveolus Why does oxygen move from the alveolus to the capillary? A Carbon dioxide molecules move from the capillary to the alveolus. B Inspiration increases the pressure in the lung. C The oxygen is absorbed by osmosis into the blood. D There is an oxygen concentration gradient in this direction.

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2015

2 What must be present for diffusion to occur? . random concentration . movement of solvent gradient molecules A Jv Jv Jv B Jv Jv x Cc Jv x Jv D x Jv Jv

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2015

2 Which is an example of diffusion? A the net movement of carbon dioxide down the carbon dioxide concentration gradient B the net movement of carbon dioxide up the sugar concentration gradient C the net movement of oxygen down the carbon dioxide concentration gradient D the net movement of sugar moving up the sugar concentration gradient

1 marks

Answer: A

This question in 0654/12 May/June 2016

4 The test-tube shows gelatine with a layer of black dye. The dye can diffuse through the gelatine. gelatine black dye What was the appearance of the test-tube after six hours? A B C D

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2017

8 During gas exchange in human lungs, which gases show a net diffusion into or out of blood capillaries? carbon dioxide nitrogen oxygen A J Jv x B J x Jv Cc x Jv x D x x Jv

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2018

2 Which row correctly describes the diffusion of molecules from P to Q? P Q movement A higher concentration lower concentration down a concentration gradient B higher concentration lower concentration up a concentration gradient C lower concentration higher concentration down a concentration gradient D lower concentration higher concentration up a concentration gradient

1 marks

Answer: A

This question in 0654/11 May/June 2019

2 The diagram shows a body cell and a blood capillary. The arrow represents the direction of diffusion. cell blood capillary For aerobic respiration to occur in the cell, which substances does the arrow represent? A carbon dioxide and glucose B carbon dioxide and water C oxygen and glucose D oxygen and water

1 marks

Answer: C

This question in 0654/12 May/June 2019

2 The diagram shows a body cell and a blood capillary. The arrow represents the direction of diffusion. cell blood capillary For aerobic respiration to occur in the cell, which substances does the arrow represent? A carbon dioxide and glucose B carbon dioxide and water C oxygen and glucose D oxygen and water

1 marks

Answer: C

This question in 0654/13 May/June 2019

2 Which row describes diffusion? direction of type of net movement movement A higher concentration non-random to lower concentration B higher concentration random to lower concentration C lower concentration non-random to higher concentration D lower concentration random to higher concentration

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2019

2 What is the net movement of molecules during diffusion? A from a higher concentration to a lower concentration down a concentration gradient B from a higher concentration to a lower concentration up a concentration gradient C from a lower concentration to a higher concentration down a concentration gradient D from a lower concentration to a higher concentration up a concentration gradient

1 marks

Answer: A

This question in 0654/11 May/June 2020

2 The diagram shows molecules of a gas at different concentrations either side of a permeable membrane. permeable membrane gas molecules P Q In which direction will the molecules move? A both ways, but more from P to Q B both ways, but more from Q to P C from P to Q only D from Q to P only

1 marks

Answer: A

This question in 0654/13 May/June 2020

2 What is an example of diffusion? A movement of blood through the capillaries B movement of food from the mouth to the stomach C movement of oxygen from alveoli to the blood D movement of urine along the urethra

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2020

2 Which diagram correctly shows the diffusion of carbon dioxide and oxygen between an alveolus and a capillary? A B air entering air entering blood blood flow flow blood blood flow flow key carbon dioxide oxygen C D air entering air entering blood blood flow flow blood blood flow flow

1 marks

Answer: C

This question in 0654/12 May/June 2021

2 Which diagram correctly shows the diffusion of carbon dioxide and oxygen between an alveolus and a capillary? A B air entering air entering blood blood flow flow blood blood flow flow key carbon dioxide oxygen C D air entering air entering blood blood flow flow blood blood flow flow

1 marks

Answer: C

This question in 0654/13 May/June 2021

2 What is the net movement of molecules during diffusion? A from a higher concentration to a lower concentration down a concentration gradient B from a higher concentration to a lower concentration up a concentration gradient C from a lower concentration to a higher concentration down a concentration gradient D from a lower concentration to a higher concentration up a concentration gradient

1 marks

Answer: A

This question in 0654/12 Feb/March 2024

6 Starch is mixed with saliva and placed into a bag made of a partially permeable membrane. The bag is placed into a tube filled with water, as shown. water starch and saliva partially permeable membrane After one hour, sugar molecules are found in the water outside the bag. Which process has taken place inside the bag? A assimilation B digestion C egestion D ingestion

1 marks

Answer: B

This question in 0654/11 May/June 2024

2 By which process does oxygen pass from the alveoli to the blood capillaries in the lungs? A diffusion B osmosis C secretion D transpiration

1 marks

Answer: A

This question in 0654/12 May/June 2024

2 By which process does oxygen pass from the alveoli to the blood capillaries in the lungs? A diffusion B osmosis C secretion D transpiration

1 marks

Answer: A

This question in 0654/13 May/June 2024