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KEy question: How do exchange surface help the movement of substances?
KEy question: How do exchange surface help the movement of substances?
Task 1 - Intro video
Task 1 - Intro video
What is an exchange surface?
Watch the video and then make a mind map of the features of exchange surfaces in you companion sheet
Task 2 - Surface area : Volume
Task 2 - Surface area : Volume
All living organisms need to move substances into and out of their cells.
This happens more easily if there is a large surface area to volume ratio.
Surface area : volume ratio is a comparison of how big the surface area is compared to the volume.
Surface area : volume ratio gets smaller as the cell gets larger.
Task - Complete the calculations in task 2 of the companion sheet (slides 4 and 5)
Task - Complete the calculations in task 2 of the companion sheet (slides 4 and 5)
Task 3 - Why is SA:V important
Task 3 - Why is SA:V important
Watch the video and then attempt the long answer style question on the companion sheet.
Task 4 - Apply knowledge
Task 4 - Apply knowledge
In this example you will need to apply your knowledge of surface area to volume ratios and how it affects the rate of movement of substances in and out of cells.
Task: Answer the question on the companion sheet
Consider a cactus. It is adapted to it's hot and dry environment by having thorns instead of leaves. Why is this?
Task 5 - consolidate
Task 5 - consolidate
Lets finish by showing off our knowledge
Have a look at the Elephants and Amoebas task at the end of the companion sheet
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