Diffusion — Paper 1 · IGCSE Biology (9-1) 0970

7 Which words correctly complete the paragraph? Diffusion may be defined as the net movement of particles from a region of their ««1«« concentration, to a region of their ««2«« concentration, where movement is ««3«« a concentration gradient. 1 2 3 A higher lower down B higher lower up C lower higher down D lower higher up

1 marks

Answer: A

This question in 0970/11 May/June 2018

8 Which part of a plant root hair is partially permeable? A the cell sap B the cell surface membrane C the cell vacuole D the cell wall

1 marks

Answer: B

This question in 0970/11 May/June 2018

7 How do carbon dioxide and oxygen move into and out of a mesophyll cell? A active transport B diffusion C respiration D transpiration

1 marks

Answer: B

This question in 0970/12 Oct/Nov 2018

6 The diagram shows a test-tube containing clear jelly. A drop of blue ink is injected into the middle of the jelly. clear jelly drop of blue ink The blue colour of the ink spreads throughout the jelly. By which process does the blue ink spread through the jelly? A active transport B catalysis C diffusion D osmosis

1 marks

Answer: C

This question in 0970/11 May/June 2019

7 The apparatus shown was set up. glass tube sugar solution pure water and blue ink partially permeable membrane Some hours later, the water in the beaker had turned blue, and the liquid in the glass tube had moved upwards. Which processes caused these changes? liquid in glass water turned tube moved blue upwards A osmosis diffusion B active transport osmosis C diffusion active transport D diffusion osmosis

1 marks

Answer: D

This question in 0970/11 May/June 2019

14 The diagram shows an experiment kept at room temperature. tubing containing starch, protease, test-tube protein and simple sugars distilled water membrane permeable to small molecules only What is present in the water surrounding the membrane after 45 minutes? A amino acids and simple sugars B protein and amino acids C protein and simple sugars D starch and simple sugars

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2019

7 What are features of osmosis? 0 0O WwW > diffusion is involved «x «Ke \K K requires cell walls \ \ x& x requires a partially permeable membrane <x \ x key /= yes X= no

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2020

7 By which process do oxygen and carbon dioxide move between cells and capillaries? A breathing B diffusion C excretion D respiration

1 marks

Answer: B

This question in 0970/11 May/June 2021

7 Which statement about diffusion is correct? A The process requires energy from respiration. B The particles must cross a cell membrane. C The net movement of particles is up a concentration gradient. D The process involves the random movement of particles.

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2021

7 Which statement describes the net movement of particles during diffusion? A from higher to lower concentration down a concentration gradient B from higher to lower concentration against a concentration gradient C from lower to higher concentration down a concentration gradient D from lower to higher concentration against a concentration gradient

1 marks

Answer: A

This question in 0970/11 May/June 2022

8 The diagram shows a section through a mesophyll cell of a leaf. Which part is partially permeable? A B C D

1 marks

Answer: B

This question in 0970/11 May/June 2022

7 By which process does oxygen move from a region of higher concentration in the alveoli to a region of lower concentration in the blood? A osmosis B breathing C diffusion D active transport

1 marks

Answer: C

This question in 0970/12 May/June 2022

8 The diagram shows a section through a mesophyll cell of a leaf. Which part is partially permeable? A B C D

1 marks

Answer: B

This question in 0970/12 May/June 2022

13 In a leaf, water moves from the surface of a mesophyll cell and then out of the leaf into the atmosphere. What is the correct order of the processes involved? A active transport  osmosis B diffusion  evaporation C evaporation  diffusion D osmosis  active transport

1 marks

Answer: C

This question in 0970/12 May/June 2022

6 The diagram shows a test-tube containing clear jelly. A drop of blue ink is injected into the middle of the jelly. clear jelly drop of blue ink The blue colour of the ink spreads throughout the jelly. By which process does the blue ink spread through the jelly? A active transport B catalysis C diffusion D osmosis

1 marks

Answer: C

This question in 0970/11 May/June 2023

6 Which statements are correct for both diffusion and osmosis? involves requires ener molecules move from movement of q nergy higher concentration to from respiration ; water only lower concentration A v v v key B Jv Jv x v= yes Cc x x v X =no D x x x

1 marks

Answer: C

This question in 0970/12 May/June 2023

7 Which process causes oxygen to pass from an alveolus in the lung into a blood capillary? A assimilation B diffusion C excretion D osmosis

1 marks

Answer: B

This question in 0970/12 Oct/Nov 2023

11 Which features of a leaf allow more diffusion of carbon dioxide into the palisade cells for photosynthesis? number of thickness stomata of the leaf A few thick B few thin C many thick D many thin

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2023

7 The diagram shows a section through an alveolus and through a capillary. wall of the alveolus air red capillary blood cells wall capillary X Y low carbon dioxide NOT TO concentration SCALE high carbon dioxide concentration How does carbon dioxide move from Y to X? A by active transport B by diffusion C by osmosis D by transpiration

1 marks

Answer: B

This question in 0970/11 May/June 2024

8 In which row will the diffusion of ions into a cell be the quickest? ion concentration ion concentration surface area of width of in the external in the cell the cell the cell membrane solution A high low large thin B low high small thick C high low small thick D low high large thin

1 marks

Answer: D

This question in 0970/11 May/June 2024

7 What is an example of diffusion? A dust particles being moved by ciliated cells in the trachea B oxygen molecules moving into a red blood cell in the lungs C pollen grains moving from anthers to stigmas in the wind D red blood cells moving in a blood capillary in a muscle

1 marks

Answer: B

This question in 0970/12 May/June 2024

7 A frog is an animal. The skin of a frog is permeable to oxygen and carbon dioxide. Which directions will have a net diffusion of oxygen and carbon dioxide when a frog swims in pond water? from the frog from the water into the water into the frog A carbon dioxide oxygen B carbon dioxide and oxygen no movement C oxygen carbon dioxide D no movement carbon dioxide and oxygen

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2024

7 The table shows the concentration of gases in a blood vessel and in an alveolus. Which row shows the conditions that cause a substance produced in respiration in humans to diffuse from the blood vessel into the alveolus? substance substance substance produced in concentration in concentration in respiration the blood vessel the alveolus A carbon dioxide low high B carbon dioxide high low C oxygen low high D oxygen high low

1 marks

Answer: B

This question in 0970/11 May/June 2025

16 The diagram shows the movement of water molecules from a plant leaf to its environment. Two processes have been numbered. 1 2 Which row identifies the numbered processes? process 1 process 2 A diffusion evaporation B evaporation diffusion C evaporation osmosis D osmosis evaporation

1 marks

Answer: B

This question in 0970/12 May/June 2025

6 What are features of osmosis? requires a partially diffusion is requires a permeable involved cell wall membrane A yes no yes B yes no no C no yes yes D no yes no

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2025