Diffusion — Paper 2 · 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 0970/21 May/June 2018

5 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 0970/22 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 0970/21 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 0970/21 May/June 2019

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 0970/22 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 0970/22 Oct/Nov 2019

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 0970/21 May/June 2021

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 0970/22 May/June 2021

6 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 0970/22 Oct/Nov 2021

5 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 0970/21 May/June 2022

6 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 0970/21 May/June 2022

5 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 0970/22 May/June 2022

6 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 0970/22 May/June 2022

6 Which row shows the conditions when diffusion of oxygen into the blood is fastest? alveolar surface concentration diffusion path area gradient distance A high high short B high low short C low high long D low low long

1 marks

Answer: A

This question in 0970/22 May/June 2025

11 Which process moves water from the surfaces of the mesophyll cells into the air spaces during transpiration? A active transport B circulation C evaporation D osmosis

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2025