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CHAPTER 3: Movement across a membrane $8.31   Add to cart

Class notes

CHAPTER 3: Movement across a membrane

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This is a set of detailed and efficient notes concerning chapter 3 in the IGCSE biology course, which deals with the transport of dissolved substances across a semi-permeable membrane. The document provides clear explanations and diagrams about the 4 main transport types and also explains what happ...

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  • October 1, 2019
  • 6
  • 2019/2020
  • Class notes
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Available practice questions

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Some examples from this set of practice questions

1.

What is one main function of a cell membrane?

Answer: To separate the inner contents of the cell from the outside

2.

Which movement process requires the passing of substances down a concentration gradient?

Answer: DIffusion and osmosis

3.

What are the ways to increase diffusion rates?

Answer: Increase steepness of concentration gradient, raise the temperature, make the surface area greater, makes diffusion distances shorter, use substances with a lower Atomic/ molecular mass number.

4.

Where in plants is diffusion used and for what reason?

Answer: Leaves: -For water vapor to diffuse out of leaves to continue the transpiration cycle -For oxygen to be released and for carbon dioxide to be taken in for photosynthesis Roots: -Certain salts and minerals are absorbed by diffusion

5.

What is one requirement needed for osmosis to take place?

Answer: A concentration gradient between water potentials has to be present

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