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Separate Science
Biology B3 1: Exchange of materials

My revision notes B3 1 in the AQA Biology syllabus
for exams in 2009.

Amna K- Ellen Wilkinson School [London]
April 2009

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials



Exchange of materials

Active Transport

For the exam: Know what active transport is and why it is important to us.

There are 2 main ways in which dissolved substances move in and out of cells.

1) Diffusion (substances) and…

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials



Exchange of materials

Exchange of gases in the lungs

For the exam: Know how the lungs are adapted to make gas exchange more efficient and
know what the alveoli are.


Many organs in our body are specialised for exchanging…

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials



Exchange of materials

Exchange of materials in the gut

For the exam: Know the adaptations in the small intestine which allow efficient food
absorption and know why are villi so important.



The gut: area in the body where food…

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials



Exchange of materials

Exchange of materials in other organisms

For the exam: Know how gas and solute exchange takes place in other organisms.



Gas exchange in fish
- Fish can't get oxygen directly form the water because of their…

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials



Exchange of materials

Exchange in plants

For the exam: Know how the leaves of plants are adapted for gaseous exchange and know
how roots are adapted for efficient uptake of water and mineral ions.

Plats also need to exchange…

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials



Exchange of materials

Transpiration

For the exam: Know what transpiration is, when plants transpire fastest, and know
how wilting aids survival.


When plant leaves open their stomata to let carbon dioxide in, water vapour is also lost at the…

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials



Acknowledgement
I would like to acknowledge that I drew up these revision notes with the help of an
AQA Science GCSE Biology book, that a kind teacher let me borrow for the
weekend :D




Noor Amna K Ellen Wilkinson…

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials




Noor Amna K Ellen Wilkinson School Exams 2009

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