Diffusion — Paper 2 · IGCSE Science - Combined 0653

2 Which process depends on diffusion? A circulation B digestion C gaseous exchange D phagocytosis

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2018

2 Which process depends on diffusion? A circulation B digestion C gaseous exchange D phagocytosis

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2018

2 Which process depends on diffusion? A circulation B digestion C gaseous exchange D phagocytosis

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2018

12 The diagram shows part of a placenta. vein artery mothers blood placenta membrane barrier umbilical vein umbilical artery Why do nutrients in the mother’s blood enter the blood in the umbilical vein? A A net movement of nutrient particles occurs from a region of high concentration to a lower concentration. B Nutrients move from a region of higher water potential to a region of lower water potential. C Pressure in the maternal blood forces nutrients into the umbilical vein. D The nutrients travel into the umbilical vein, across a partially permeable membrane by osmosis.

1 marks

Answer: A

This question in 0653/23 May/June 2019

6 The diagram shows an alveolus and a blood capillary. 2 1 4 3 Which two arrows represent gas exchange by diffusion only? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: D

This question in 0653/22 Oct/Nov 2019

12 The diagram shows a placenta and umbilical cord. X key umbilical artery X movement of oxygen from fetus to fetus X mother’s umbilical blood vein X Which row is correct? high oxygen low oxygen name of concentration concentration process X present present A umbilical artery umbilical vein diffusion B umbilical artery umbilical vein osmosis C umbilical vein umbilical artery diffusion D umbilical vein umbilical artery osmosis

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2020

1 The diagram shows two red blood cells inside a capillary and two tissue cells near this capillary. red blood cell tissue cell How does the oxygen in the red blood cells reach the tissue cells? A by absorption B by diffusion C by respiration D by transpiration

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2020

2 The diagrams represent four similar animal cells immersed in blood plasma. The black dots represent molecules of dissolved oxygen. Which cell will have oxygen molecules diffusing into it most rapidly? A B C D

1 marks

Answer: C

This question in 0653/21 May/June 2021

2 The diagrams represent four similar animal cells immersed in blood plasma. The black dots represent molecules of dissolved oxygen. Which cell will have oxygen molecules diffusing into it most rapidly? A B C D

1 marks

Answer: C

This question in 0653/22 May/June 2021

2 The diagrams represent four similar animal cells immersed in blood plasma. The black dots represent molecules of dissolved oxygen. Which cell will have oxygen molecules diffusing into it most rapidly? A B C D

1 marks

Answer: C

This question in 0653/23 May/June 2021

2 What is the definition of diffusion? A the downward movement of particles in the atmosphere B the movement of particles down a concentration gradient C the movement of molecules against a concentration gradient D the movement of particles from a hotter to a cooler region

1 marks

Answer: B

This question in 0653/23 May/June 2022

3 What is diffusion? A net movement of molecules down a concentration gradient B net movement of molecules up a concentration gradient C total movement of molecules down a concentration gradient D total movement of molecules up a concentration gradient

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2023

2 Which statement about diffusion is correct? A Diffusion occurs only in living organisms. B Diffusion occurs only in solution. C Diffusion occurs only through a cell wall. D Diffusion occurs only down a concentration gradient.

1 marks

Answer: D

This question in 0653/23 Oct/Nov 2023

2 Molecules can move from one area to another by diffusion. Which statement applies to diffusion? A A partially permeable membrane is needed for diffusion to happen. B Diffusion can only happen when a substance is in solution in water. C Molecules can only enter or leave living cells by diffusion. D Molecules move by diffusion down a concentration gradient.

1 marks

Answer: D

This question in 0653/22 May/June 2024

3 A student uses a starch suspension contained in a transparent partially permeable membrane to investigate diffusion. The membrane is placed in a beaker of X. The diagram shows the start and finish of the investigation. membrane starch suspension X beaker start finish The colour of the starch suspension changes from white to blue-black. What is X? A Benedict’s solution B biuret solution C ethanol D iodine solution

1 marks

Answer: D

This question in 0653/21 Oct/Nov 2024

9 Which statement explains why root hair cells have a long, thin shape? A They are squeezed into this shape as they grow between soil particles. B It is the most efficient shape for taking up food such as glucose. C It provides a large surface area for diffusion of water. D The narrow diameter allows them to gain carbon dioxide from between soil particles.

1 marks

Answer: C

This question in 0653/22 May/June 2025

10 The diagram shows structures called lamellae. Lamellae are found in the gills of fish. lamellae Lamellae give the gills a large surface area. The gills are the site of gas exchange in fish. What is the effect of this large surface area? A low rate of carbon dioxide diffusion into the blood B low rate of oxygen diffusion into the blood C high rate of carbon dioxide diffusion into the blood D high rate of oxygen diffusion into the blood

1 marks

Answer: D

This question in 0653/23 Oct/Nov 2025