AQA Biology Unit 3 (higher tier covered)

Hey, here is an extensive revision guide I made for B3 (sep-Sci bio) on Topic 1.

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  • Created by: Amna K
  • Created on: 25-04-09 13:22
Preview of AQA Biology Unit 3 (higher tier covered)

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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 2)Osmosis (water)
Both of them go along the concentration gradient.
Active Transport on the other hand, goes against the concentration gradient.…read more

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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 materials- one of them is our lungs.
Our body needs a constant supply of oxygen for respiration, and also produces a lot of carbon dioxide as a result of
that.…read more

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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 is broken down into simple sugars like glucose, amino acids, fatty
acids and glycerol; and then takes part in exchange of materials.…read more

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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 protective scales. But not to worry, they
have a very effective respiratory system which includes gills that aide gas diffusion.
- Gills are made of many layers of thin tissue with a rich blood supply.…read more

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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 materials like animals do.
- They need to carry out diffusion to get carbon dioxide needed for photosynthesis,.…read more

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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 same
time. This is an unwanted side affect of stomata opening. The whole time that stomata are opened
and water is lost is called transpiration.…read more

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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 School Exams 2009…read more

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Separate Science Revision Guide Biology Unit B3 1 Exchange of Materials
Noor Amna K Ellen Wilkinson School Exams 2009…read more

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